You should read the following discussion and analysis of our financial condition
and results of operations together with the consolidated financial statements
and related notes that are included elsewhere in this Annual Report on Form
10-K. This discussion contains forward-looking statements based upon current
plans, expectations and beliefs that involve risks and uncertainties. Our actual
results may differ materially from those anticipated in these forward-looking
statements as a result of various factors, including those set forth under "Risk
Factors" and elsewhere in this Annual Report on Form 10-K.
Overview
Arista Networks pioneered software-driven, cognitive cloud networking for
large-scale data center and campus environments. Our cloud networking solutions
consist of our EOS, a set of network applications and our Ethernet switching and
routing platforms. Our cloud networking solutions deliver industry-leading
performance, scalability, availability, programmability, automation and
visibility. At the core of our cloud networking platform is EOS, which was
purpose-built to be fully programmable, highly modular and reliable. The
programmability of EOS has allowed us to create a set of software applications
that address the requirements of cloud networking, including workflow
automation, network visibility and analytics, and has also allowed us to rapidly
integrate with a wide range of third-party applications for virtualization,
management, automation, orchestration and network services.
We believe that cloud networking will continue to replace legacy network
technologies across data center and campus environments. Our cloud networking
platforms are well positioned to address the growing cloud networking market,
and to address increasing performance requirements driven by the growing number
of connected devices, as well as the need for constant connectivity and access
to data and applications.
We generate revenue primarily from sales of our switching and routing products
which incorporate our EOS software. We generate the majority of our services
revenue from post contract support, or PCS, which end customers typically
purchase in conjunction with our products. Our end customers span a range of
industries and include large internet companies, service providers, financial
services organizations, government agencies, media and entertainment companies
and others. As we have grown the functionality of our EOS software, expanded the
range of our product portfolio and increased the size of our sales force, our
revenue has grown rapidly. We have also been profitable and operating cash flow
positive for each year since 2010.
We believe our future success is dependent upon our ability to continue to
develop market leading products and features that address the needs of our end
customers and our ability to sell these products to new and existing customers,
including an increase in sales in the enterprise data center switching, campus
and WiFi networking markets. We intend to continue expanding our sales force and
marketing activities in key geographies, as well as our relationships with
channel, technology and system-level partners in order to reach new end
customers more effectively, increase sales to existing customers, and provide
services and support. In addition, we intend to continue to invest in our
research and development organization to enhance the functionality of our
existing cloud networking

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platform, introduce new products and features, and build upon our technology
leadership. We believe one of our greatest strengths lies in our rapid
development of new features and applications.
Our development model is focused on the development of new products based on our
EOS software and enhancements to EOS. We engineer our products to be agnostic to
the underlying merchant silicon architecture. Today, we combine our EOS software
with merchant silicon into a family of switching and routing products. This
enables us to focus our research and development resources on our software core
competencies and to leverage the investments made by merchant silicon vendors to
achieve cost-effective solutions. We work closely with third party contract
manufacturers to manufacture our products. Our contract manufacturers deliver
our products to our third party direct fulfillment facilities.  We and our
fulfillment partners then perform labeling, final configuration, quality
assurance testing and shipment to our customers.
Historically, large purchases by a relatively limited number of end customers
have accounted for a significant portion of our revenue. We have experienced
unpredictability in the timing of orders from these large end customers
primarily due to changes in demand patterns specific to these customers, the
time it takes these end customers to evaluate, test, qualify and accept our
products, and the overall complexity of these large orders. We expect continued
variability in our customer concentration and timing of sales on a quarterly and
annual basis. For example, our sales to Microsoft and Facebook as end users in
fiscal 2019 represented 23% and 17% of our revenue, respectively, and benefited
from certain factors that are not expected to repeat in fiscal 2020.
Consequently, the percentage of our revenue from Microsoft and Facebook in
fiscal 2020 is expected to decline, which will likely negatively impact our
revenue growth. In addition, we have provided, and may in the future provide,
pricing discounts to large end customers, which may result in lower margins for
the period in which such sales occur.


Results of Operations
Year Ended December 31, 2019 Compared to Year Ended December 31, 2018
Revenue, Cost of Revenue and Gross Profit (in thousands, except percentages)
                                      Year Ended December 31,
                                  2019                       2018                  Change in
                                          % of                       % of
                              $         Revenue          $         Revenue        $          %
Revenue
Product                 $ 2,021,150       83.8 %   $ 1,841,100       85.6 %   $ 180,050     9.8 %
Service                     389,556       16.2         310,269       14.4        79,287    25.6
Total revenue             2,410,706      100.0       2,151,369      100.0       259,337    12.1
Cost of revenue
Product                     792,382       32.9         720,584       33.5        71,798    10.0
Service                      73,986        3.0          57,408        2.7        16,578    28.9
Total cost of revenue       866,368       35.9         777,992       36.2        88,376    11.4
Gross profit            $ 1,544,338       64.1 %   $ 1,373,377       63.8 %   $ 170,961    12.4 %
Gross margin                   64.1 %                     63.8 %




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Revenue by Geography (in thousands, except percentages)


                                                 Year Ended December 31,
                                     2019       % of Total        2018       % of Total
Americas                         $ 1,833,163         76.1 %   $ 1,550,453         72.1 %
Europe, Middle East and Africa       381,651         15.8         414,069         19.2
Asia-Pacific                         195,892          8.1         186,847          8.7
Total revenue                    $ 2,410,706        100.0 %   $ 2,151,369        100.0 %


Revenue
We generate revenue primarily from sales of our products. We also derive a
portion of our revenue from sales of PCS, which is typically purchased in
conjunction with our products, and subsequent renewals of those contracts. We
expect our revenue may vary from period to period based on, among other things,
the timing, size, and complexity of orders, especially with respect to our large
end customers.
Product revenue increased $180.1 million, or 9.8%, in the year ended
December 31, 2019 compared to 2018. The increase was primarily driven by
increased demand from both new and existing customers, and the recognition of
product deferred revenue related to sales in the prior year for which revenue
was recognized in 2019. Service revenue increased $79.3 million, or 25.6% in the
year ended December 31, 2019 compared to 2018 as a result of continued growth in
initial and renewal support contracts as our customer installed base has
continued to expand. International revenues represented 23.9% of total revenues
in the year ended December 31, 2019, compared to 27.9% in 2018, which was
primarily due to a move toward U.S. deployments by certain of our large end
customers during 2019. We continue to experience pricing pressure on our
products and services due to competition, but demand for our products and growth
in our installed base has more than offset this pricing pressure during the
year. However, we have experienced reduced and volatile demand from certain of
our large end customers during 2019, and expect this could continue in future
periods, which could impact our future revenue growth.
Cost of Revenue and Gross Margin
Cost of revenue primarily consists of amounts paid for inventory to our
third-party contract manufacturers and merchant silicon vendors, overhead costs
in our manufacturing operations department, and other manufacturing-related
costs associated with manufacturing our products and managing our inventory.
Cost of providing PCS and other services primarily consists of personnel costs
for our global customer support organization.
Cost of revenue increased $88.4 million or 11.4% for the year ended December 31,
2019 compared to 2018. The increase in cost of revenue was primarily due to the
corresponding increases in product and service revenues.
Gross margin, or gross profit as a percentage of revenue, has been and will
continue to be affected by a variety of factors, including sales to large end
customers who generally receive lower pricing, manufacturing-related costs
including costs associated with supply chain sourcing activities, merchant
silicon costs, the mix of products sold, and excess/obsolete inventory
write-downs, including charges for excess/obsolete component inventory held by
our contract manufacturers. We expect our gross margins to fluctuate over time,
depending on the factors described above.
Gross margin increased to 64.1% for the year ended December 31, 2019 compared to
63.8% in 2018. The increase in gross margin was primarily driven by an increase
in product margins due to favorable customer mix, with lower discounts on
smaller volume transactions, partially offset by increased product transition
costs, including excess and obsolete inventory-related charges.
Operating Expenses (in thousands, except percentages)
Our operating expenses consist of research and development, sales and marketing,
general and administrative expenses, and legal settlement expenses. The largest
component of our operating expenses is personnel costs. Personnel costs consist
of wages, benefits, bonuses and, with respect to sales and marketing expenses,
sales commissions. Personnel costs also include stock-based compensation and
travel expenses. We

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expect operating expenses to continue to increase in absolute dollars in the near term as we continue to invest in the growth of our business.


                                          Year Ended December 31,
                                      2019                       2018                     Change in
                                              % of                       % of
                                  $         Revenue          $         Revenue         $             %
Operating expenses:
Research and development     $  462,759       19.2 %   $   442,468       20.6 %   $   20,291         4.6  %
Sales and marketing             213,907        8.9         187,142        8.7         26,765        14.3
General and administrative       61,898        2.6          65,420        3.0         (3,522 )      (5.4 )
Legal settlement                      -          -         405,000       18.8       (405,000 )    (100.0 )
Total operating expenses     $  738,564       30.7 %   $ 1,100,030       51.1 %   $ (361,466 )     (32.9 )%
__________________



Research and development.
Research and development expenses consist primarily of personnel costs,
prototype expenses, third-party engineering and contractor support costs, and an
allocated portion of facility and IT costs, including depreciation. Our research
and development efforts are focused on maintaining and developing additional
functionality for our existing products and on new product development,
including new releases and upgrades to our EOS software and applications. We
expect our research and development expenses to increase in absolute dollars as
we continue to invest in software development in order to expand the
capabilities of our cloud networking platform, introduce new products and
features, and build upon our technology leadership.
Research and development expenses increased $20.3 million, or 4.6%, for the year
ended December 31, 2019 compared to 2018. The increase was primarily due to a
$17.2 million increase in personnel costs driven primarily by headcount growth,
and a $7.8 million increase in in development-related facilities costs due to
facilities expansion and headcount growth, partially offset by a $5.9 million
decrease in new product introduction costs, including third-party engineering
and other product development costs.
Sales and marketing.
Sales and marketing expenses consist primarily of personnel costs, marketing,
trade shows, and other promotional activities, and an allocated portion of
facility and IT costs, including depreciation. We expect our sales and marketing
expenses to increase in absolute dollars as we continue to expand our sales and
marketing efforts worldwide.
Sales and marketing expenses increased $26.8 million, or 14.3% for the year
ended December 31, 2019 compared to 2018. The increase primarily included a
$23.4 million increase in personnel costs, which was driven by increased
headcount as well as higher sales volumes, resulting in increased compensation
costs, including commissions and stock-based compensation.
General and administrative.
General and administrative expenses consist primarily of personnel costs and
professional services fees, including Cisco and OptumSoft litigation-related
expenses. General and administrative personnel costs include those for our
executive, finance, human resources and legal functions. Our professional
services fees are primarily related to external legal, accounting, and tax
services.
General and administrative expenses decreased $3.5 million, or 5.4%, for the
year ended December 31, 2019 compared to 2018. The decrease was primarily
related to a reduced level of litigation activities as a result of the
settlement of our litigation with Cisco in August 2018.

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Legal settlement.
During the three months ended June 30, 2018, we recorded $405.0 million in legal
settlement expenses in connection with the Term Sheet that was entered into on
August 6, 2018 between the Company and Cisco, which included a $400.0 million
payment and $5.0 million of legal fees associated with the settlement. Pursuant
to the Term Sheet, the Company and Cisco obtained dismissals of all then ongoing
district court and USITC litigation between us. On December 3, 2018, the parties
entered into a mutual release and settlement agreement, which superseded the
Term Sheet but did not substantially alter the terms.
Other Income (Expense), Net (in thousands, except percentages)
Other income (expense) consists primarily of interest income from our cash, cash
equivalents and marketable securities, gains and losses on our investments in
privately-held companies, and foreign currency transaction gains and losses.
Upon adoption of Accounting Standard Codification Topic 842 - Leases ("ASC 842")
on January 1, 2019, we derecognized the finance lease obligation associated with
our build-to-suit lease, and therefore will not incur further interest expense
as it relates to this obligation. See Note 1. Organization and Summary of
Significant Accounting Policies of the Notes to Consolidated Financial
Statements included in Part II, Item 8, of this Annual Report on Form 10-K for
further discussion. We expect other income (expense), net may fluctuate in the
future as a result of the re-measurement of our private company equity
investments upon the occurrence of observable price change and/or impairments,
changes in interest rates or returns on our cash and cash equivalents and
marketable securities, and foreign currency exchange rate fluctuations.
                                         Year Ended December 31,
                                      2019                     2018                   Change in
                                             % of                    % of
                                  $        Revenue        $         Revenue        $             %
Other income (expense),
net:
Interest income               $ 51,144        2.2 %   $ 31,666        1.4  %   $ 19,478         61.5  %
Interest expense                     -          -       (2,701 )     (0.1 )       2,701       (100.0 )
Gain (loss) on investments
in privately-held companies      5,427        0.2      (13,800 )     (0.6 )      19,227       (139.3 )
Other income (expense)             (75 )        -          289          -          (364 )     (126.0 )
Total other income
(expense), net                $ 56,496        2.4 %   $ 15,454        0.7  %   $ 41,042        265.6  %


The favorable change in other income (expense), net, during the year ended
December 31, 2019 as compared to 2018 was driven by a $19.5 million increase in
interest income as we continued to generate cash and expand our marketable
securities portfolios, and a $19.2 million favorable change on our investments
in privately-held companies resulting from the gain on certain investments of
$5.4 million in 2019, compared to a net loss of $13.8 million on these
investments during 2018. See Note 5. Investments of the Notes to Consolidated
Financial Statements included in Part II, Item 8, of this Annual Report on Form
10-K for further discussion.
Provision for (Benefit from) Income Taxes (in thousands, except percentages)
We operate in a number of tax jurisdictions and are subject to taxes in each
country or jurisdiction in which we conduct business. Earnings from our non-U.S.
activities are subject to local country income tax and may also be subject to
U.S. income tax. Generally, our U.S. tax obligations are reduced by a credit for
foreign income taxes paid on these foreign earnings which avoids double
taxation. Our tax expense to date consists of federal, state and foreign current
and deferred income taxes.

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                                        Year Ended December 31,
                                    2019                       2018                   Change in
                                            % of                      % of
                                $         Revenue         $          Revenue         $           %
Provision for (benefit
from) income taxes         $    2,403        0.1 %   $ (39,314 )      (1.9 )%   $  41,717     (106.1 )
Effective tax rate                0.3 %                  (13.6 )%


For the years ended December 31, 2019 and 2018, we recorded an expense of $2.4
million and a benefit of $39.3 million for income taxes, respectively. The
change in our income taxes was largely attributable to a $96.9 million tax
benefit on the Cisco settlement in 2018 and an overall increase in worldwide
earnings in 2019, partially offset by a net tax benefit of $86 million resulting
from an intra-entity transaction to sell our non-Americas economic and
beneficial intellectual property rights. For further information regarding
income taxes and the impact on our results of operations and financial position,
see Note 10. Income Taxes of the Notes to Consolidated Financial Statements
included in Part II, Item 8, of this Annual Report on Form 10-K.
Year Ended December 31, 2018 Compared to Year Ended December 31, 2017
Revenue, Cost of Revenue and Gross Profit (in thousands, except percentages)
                                      Year Ended December 31,
                                  2018                       2017                  Change in
                                          % of                       % of
                              $         Revenue          $         Revenue        $          %
Revenue
Product                 $ 1,841,100       85.6 %   $ 1,432,810       87.0 %   $ 408,290    28.5 %
Service                     310,269       14.4         213,376       13.0        96,893    45.4
Total revenue             2,151,369      100.0       1,646,186      100.0       505,183    30.7
Cost of revenue
Product                     720,584       33.5         538,035       32.7       182,549    33.9
Service                      57,408        2.7          46,382        2.8        11,026    23.8
Total cost of revenue       777,992       36.2         584,417       35.5       193,575    33.1
Gross profit            $ 1,373,377       63.8 %   $ 1,061,769       64.5 %   $ 311,608    29.3 %
Gross margin                   63.8 %                     64.5 %


Revenue by Geography (in thousands, except percentages)


                                                 Year Ended December 31,
                                     2018       % of Total        2017       % of Total
Americas                         $ 1,550,453         72.1 %   $ 1,192,289         72.4 %
Europe, Middle East and Africa       414,069         19.2         299,547         18.2
Asia-Pacific                         186,847          8.7         154,350          9.4
Total revenue                    $ 2,151,369        100.0 %   $ 1,646,186        100.0 %


Revenue
Product revenue increased $408.3 million, or 28.5%, in the year
ended December 31, 2018 compared to 2017. The increase was primarily driven by
sales to our existing customers as they continued to expand and upgrade their
cloud networks. In addition, our newer switch products have continued to gain
market acceptance, which has contributed to our revenue growth. Service revenue
increased $96.9 million, or 45.4%, in the year ended December 31, 2018 compared
to 2017 as a result of continued growth in initial and renewal support contracts
as our customer installed base has continued to expand. We continue to
experience pricing pressure on our products

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and services due to competition, but demand for our products and growth in our
installed base has more than offset this pricing pressure during the period.
Cost of Revenue and Gross Margin
Cost of revenue increased $193.6 million or 33.1% for the year
ended December 31, 2018 compared to 2017. The increase in cost of revenue was
primarily due to the corresponding increases in product revenues.
Gross margin decreased from 64.5% to 63.8% for the year ended December 31,
2018 compared to 2017. The decrease in gross margin was primarily driven by a
decrease in product margins due to customer mix, partially offset by reduced
inventory-related charges and an improved service margins due to a relatively
fixed services cost base and growing service revenues. We expect our gross
margins to fluctuate over time, depending on the factors described above.
Operating Expenses (in thousands, except percentages)
                                          Year Ended December 31,
                                       2018                      2017                   Change in
                                               % of                      % of
                                   $         Revenue         $         Revenue         $           %
Operating expenses:
Research and development     $   442,468       20.6 %   $  349,594       21.2 %   $  92,874      26.6  %
Sales and marketing              187,142        8.7        155,105        9.4        32,037      20.7
General and administrative        65,420        3.0         86,798        5.3       (21,378 )   (24.6 )
Legal settlement                 405,000       18.8              -          

- 405,000 * Total operating expenses $ 1,100,030 51.1 % $ 591,497 35.9 % $ 508,533 86.0 %




Research and development
Research and development expenses increased $92.9 million, or 26.6%, for the
year ended December 31, 2018 compared to 2017. The increase was primarily due to
a $48.9 million increase in personnel costs, including corporate bonuses and
stock-based compensation, driven primarily by headcount growth from our normal
hiring process and from the two acquisitions we completed in the third quarter
of 2018, and a $24.7 million increase in new product introduction costs, driven
by additional development projects. In addition, facility and IT costs increased
by $9.5 million due to increased IT services, headcount growth and additional
costs associated with our acquired businesses.
Sales and marketing
Sales and marketing expenses increased $32.0 million, or 20.7% for the year
ended December 31, 2018 compared to 2017. The increase primarily included
a $28.0 million increase in personnel costs, which was driven by increased
headcount as well as higher sales volumes, resulting in increased compensation
costs, including commissions and stock-based compensation.
General and administrative
General and administrative expenses decreased $21.4 million, or 24.6%, for the
year ended December 31, 2018 compared to 2017. The decrease included a $33.8
million decrease that was primarily related to a reduced level of litigation
activities and a decrease in bond costs as a result of the settlement of the
Cisco litigation in August 2018. The decrease was partially offset by $3.5
million of acquisition-related expenses incurred in 2018, a $3.3
million increase in personnel costs, including increased stock-based
compensation, driven by increased headcount, and a $3.1 million increase in
other legal and professional fees.
Legal settlement
During the three months ended June 30, 2018, we recorded $405.0 million in legal
settlement expenses in connection with the Term Sheet that was entered into on
August 6, 2018 between the Company and Cisco, which included a $400.0 million
payment and $5.0 million of legal fees associated with the settlement. Pursuant
to the

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Term Sheet, the Company and Cisco obtained dismissals of all then ongoing
district court and USITC litigation between us. On December 3, 2018, the parties
entered into a mutual release and settlement agreement, which superseded the
Term Sheet but did not substantially alter the terms.
Other Income (Expense), Net (in thousands, except percentages)
                                          Year Ended December 31,
                                      2018                      2017                    Change in
                                             % of                      % of
                                 $         Revenue         $         Revenue         $            %
Other income (expense),
net:
Interest income              $ 31,666         1.4  %   $  8,093         0.5  %   $ 23,573       291.3  %
Interest expense               (2,701 )      (0.1 )      (2,780 )      (0.2 )          79        (2.8 )
Gain (loss) on investments
in privately-held
companies                     (13,800 )      (0.6 )           -           -       (13,800 )       *
Other income (expense)            289           -          (825 )      (0.1 )       1,114      (135.0 )
Total other income
(expense), net               $ 15,454         0.7  %   $  4,488         0.2 

% $ 10,966 244.3 %




The favorable change in other income (expense), net, during the year ended
December 31, 2018 as compared to 2017 was driven by a $23.6 million increase in
interest income as we continued to generate cash and expand our marketable
securities portfolios, which was offset partially by a $13.8 million net loss
recorded in 2018 on our investments in privately-held companies. See Note 5.
Investments of the Notes to Consolidated Financial Statements included in Part
II, Item 8, of this Annual Report on Form 10-K for further discussion.
Provision for Income Taxes (in thousands, except percentages)
                                            Year Ended December 31,
                                        2018                        2017                     Change in
                                                % of                       % of
                                   $          Revenue          $          Revenue         $             %
Provision for income taxes   $  (39,314 )       (1.9 )%   $   51,559         3.1 %   $  (90,873 )    (176.3 )%
Effective tax rate                (13.6 )%                      10.9 %


For the years ended December 31, 2018 and 2017, we recorded a benefit of $39.3
million and an expense of $51.6 million for income taxes, respectively. The
change in our income taxes was largely attributable to a $96.9 million tax
benefit on the Cisco settlement in 2018 whereas we recorded a $51.8 million tax
expense in 2017 related to the enactment of the Tax Act. The Tax Act provided
for a decrease in the 2018 U.S. federal statutory tax rate, but this
was partially offset by a new requirement to provide U.S. tax on foreign
earnings. For further information regarding income taxes and the impact on our
results of operations and financial position, see Note 10. Income Taxes of the
Notes to Consolidated Financial Statements included in Part II, Item 8, of this
Annual Report on Form 10-K.
Liquidity and Capital Resources
Our principal sources of liquidity are cash, cash equivalents, marketable
securities, and cash generated from operations. As of December 31, 2019, our
total balance of cash, cash equivalents and marketable securities was $2.7
billion, of which approximately $472.5 million was held outside the U.S. in our
foreign subsidiaries.
Our cash, cash equivalents and marketable securities are held for working
capital purposes. Our marketable securities investment portfolio is primarily
invested in highly-rated securities with the primary objective of minimizing the
potential risk of principal loss. We plan to continue to invest for long-term
growth. We believe that our existing balances of cash, cash equivalents and
marketable securities, together with cash generated from operations will be
sufficient to meet our working capital requirements and our growth strategies
for at least the next 12 months. Our future capital requirements will depend on
many factors, including our growth rate, the timing and extent of our spending
to support research and development activities, the timing and cost of
establishing

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additional sales and marketing capabilities, the introduction of new and
enhanced product and service offerings, our costs associated with supply chain
activities, including access to outsourced manufacturing, our costs related to
investing in or acquiring complementary or strategic businesses and
technologies, the continued market acceptance of our products, and stock
repurchases. If we require or elect to seek additional capital through debt or
equity financing in the future, we may not be able to raise capital on terms
acceptable to us or at all. If we are required and unable to raise additional
capital when desired, our business, operating results and financial condition
may be adversely affected.


Cash Flows
                                                                   Year Ended December 31,
                                                      2019                      2018                   2017
                                                                                                   As Adjusted
                                                                                                       (1)
                                                                        (in thousands)
Cash provided by operating activities         $       963,034           $       503,119           $    631,627
Cash used in investing activities (1)                (284,072 )                (755,113 )             (391,320 )
Cash (used in) provided by financing
activities                                           (217,964 )                  42,851                 51,469
Effect of exchange rate changes                           353                    (1,390 )                  753
Net increase/(decrease) in cash, cash
equivalents and restricted cash               $       461,351           $      (210,533 )         $    292,529
__________________________
(1) Cash used in investing activities for year ended December 31, 2017 were adjusted as a result of our adoption
of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, in the first quarter of 2018. See Note 1.
Organization and Summary of Significant Accounting Policies included in Part II, Item 8, of this Annual Report
on Form 10-K for more information.


Cash Flows from Operating Activities
Our operating activities have consisted of net income, adjusted for certain
non-cash items, and changes in assets and liabilities.
During the year ended December 31, 2019, cash provided by operating activities
was $963.0 million, primarily from net income of $859.9 million and net non-cash
adjustments to net income of $62.4 million, partially offset by a net decrease
of $40.8 million in cash from changes in our operating assets and liabilities.
Cash outflows from operating activities consisted of an $11.9 million decrease
in deferred revenue primarily due to the recognition of product deferred revenue
related to contract acceptance terms, largely offset by increased service
deferred revenue related to growth in customer service and support contracts,
a $60.2 million increase in accounts receivable due to timing of shipments, and
an $8.1 million increase in other assets resulting from increased spares
inventory to support our customer base. These cash outflows were partially
offset by cash inflows of $54.3 million in prepaid expenses and other current
assets from a decrease in deferred cost of inventory due to the recognition of
product deferred revenue, $23.5 million from an increase in income taxes
payable, $20.9 million decrease in inventories due to timing of product
shipments and receipts, and $16.4 million from increased accrued liabilities
primarily due to an increase in supplier liability reserves for excess and
obsolete component inventory.
During the year ended December 31, 2018, cash provided by operating activities
was $503.1 million, net of $405.0 million payments for the legal settlement with
Cisco including the associated legal fees. Our cash provided by operating
activities was primarily from net income of $328.1 million, non-cash adjustments
to net income of $71.4 million, and a net increase of $103.6 million in cash
from changes in our operating assets and liabilities. Our operating cash
benefited $70.5 million from increased deferred revenue reflecting ongoing
growth in service and support contracts, $51.1 million from decreased
inventories driven by improved inventory management and timing of
receipts, $39.3 million from increased accounts payable due to timing of vendor
payments primarily related to inventory-related purchases, $21.4 million from a
decrease in prepaid expenses and other assets primarily

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due to decreased deposits at our contract manufacturers, and $17.5 million from
an increase in other long term liabilities primarily driven by increased
customer prepayments under cancellable contracts. These favorable changes were
partially offset by unfavorable changes of $77.9 million from increased accounts
receivable due to increased billing and timing of customer shipments, and $14.8
million from decreased accrued liabilities due primarily to a decline in
supplier liabilities and the timing of vendor accruals.
Cash Flows from Investing Activities
Our investing activities have consisted primarily of purchases of available for
sale marketable securities, net of proceeds from maturities of marketable
securities, business acquisitions, investments in privately-held companies, and
capital expenditures.
During the year ended December 31, 2019, cash used in investing activities was
$284.1 million, primarily consisting of purchases of available-for-sale
securities of $1.5 billion, and purchases of property and equipment of 15.8
million, partially offset by proceeds of $1.2 billion from maturities of
marketable securities and proceeds from the sale of one of our investments in
privately-held companies of $28.2 million.
During the year ended December 31, 2018, cash used in investing activities
was $755.1 million, consisting of purchases of marketable securities of $1.2
billion, offset by proceeds of $547.8 million from maturities of marketable
securities, $96.8 million for business acquisitions, additional investments in
privately-held companies of $8.0 million, and purchases of property, equipment
and other assets of $23.8 million.
Cash Flows from Financing Activities
Our financing activities have consisted primarily of proceeds from the issuance
of our common stock under employee equity incentive plans, offset by repurchases
of our common stock.
During the year ended December 31, 2019, cash provided by financing activities
was $218.0 million, consisting primarily of payments for repurchases of our
common stock of $266.1 million and taxes paid of $9.2 million upon vesting of
restricted stock units, offset partially by proceeds from the issuance of common
stock under employee equity incentive plans of $57.4 million.
During the year ended December 31, 2018, cash provided by financing activities
was $42.9 million, consisting primarily of proceeds of $53.7 million from the
issuance of common stock under employee equity incentive plans, partially offset
by $8.9 million of taxes paid upon vesting of restricted stock units, and
payments of $1.9 million for lease financing obligations.
Stock Repurchase Program
From time to time, we repurchase our common stock opportunistically pursuant to
our Repurchase Program authorized by our board of directors in April 2019. The
Repurchase Program allows for stock repurchases of up to $1.0 billion and these
repurchases are funded from working capital. The Repurchase Program, which
expires in April 2022, does not obligate us to acquire any of our common stock,
and may be suspended or discontinued by us at any time without prior notice. As
of December 31, 2019, we repurchased a total of $266.1 million of our common
stock, and the remaining authorized amount for repurchases under the Repurchase
Program was $733.9 million. Refer to Note 8. Equity Award Plan Activities of the
Notes to Consolidated Financial Statements included in Part II, Item 8, of this
Annual Report on Form 10-K for further discussion.

Off-Balance Sheet Arrangements
As of December 31, 2019, we did not have any relationships with any
unconsolidated entities or financial partnerships, such as entities often
referred to as structured finance or special purpose entities that would have
been established for the purpose of facilitating off-balance sheet arrangements
or other contractually narrow or limited purposes.


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Contractual Obligations and Commitments
Our contractual commitments will have an impact on our future liquidity. Our
contractual obligations represent material expected or contractually committed
future payment obligations. We believe that we will be able to fund these
obligations through cash generated from operations and from our existing
balances of cash, cash equivalent and marketable securities.
The following summarizes our contractual obligations and commitments as of
December 31, 2019 (in thousands):
                                                                  Payments Due by Period
                                                    Less than                                             More than
                                        Total         1 Year        1 to 3 Years       3 to 5 Years        5 Years
Operating lease obligations            117,065         20,563             42,794             27,488          26,220
Purchase commitments with contract
manufacturers and suppliers            279,203        279,203                  -                  -               -
Other non-cancellable purchase
obligations                             15,482         15,482                  -                  -
Transition tax payable                   5,967              -                  -              2,025           3,942
Total                                $ 417,717     $  315,248     $       42,794     $       29,513     $    30,162


The contractual obligation table above excludes tax liabilities of $57.5 million
related to uncertain tax positions because we are unable to make a reasonably
reliable estimate of the timing of settlement, if any, of these future payments.
In connection with Tax Reform, as of December 31, 2017, we recorded a federal
income tax payable for transition tax on the mandatory deemed repatriation of
foreign earnings that will be payable over an eight-year period. The amounts
included in the table above represent the remaining federal income tax payable
after applying the first year's installment payment and early payments of future
installments.
Critical Accounting Policies and Estimates
We have prepared our consolidated financial statements in accordance with U.S.
generally accepted accounting principles (GAAP) and include our accounts and the
accounts of our wholly owned subsidiaries. The preparation of these consolidated
financial statements requires our management to make estimates, assumptions and
judgments that affect the reported amounts of assets and liabilities at the date
of the financial statements, disclosure of contingent assets and liabilities at
the date of the financial statements and the reported amounts of revenue and
expenses during the applicable periods. We base our estimates, assumptions and
judgments on historical experience and on various other factors that we believe
to be reasonable under the circumstances. Different assumptions and judgments
would change the estimates used in the preparation of our consolidated financial
statements, which, in turn, could change the results from those reported. We
evaluate our estimates, assumptions and judgments on an ongoing basis. Actual
results may differ from these estimates. To the extent that there are material
differences between these estimates and our actual results, our future financial
statements will be affected. The critical accounting estimates, assumptions and
judgments that we believe have the most significant impact on our consolidated
financial statements are the following:
Revenue Recognition
We generate revenue from sales of our products, which incorporate our EOS
software and accessories such as cables and optics, to direct customers and
channel partners together with PCS. We typically sell products and PCS in a
single contract. We recognize revenue upon transfer of control of promised
products or services to customers in an amount that reflects the consideration
we expect to be entitled to receive in exchange for those products or services.
We apply the following five-step revenue recognition model:
• Identification of the contract, or contracts, with a customer


• Identification of the performance obligations in the contract

• Determination of the transaction price

• Allocation of the transaction price to the performance obligations in the


        contract



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• Recognition of revenue when (or as) we satisfy the performance obligation




Post-Contract Customer Support
PCS, which includes technical support, hardware repair and replacement parts
beyond standard warranty, bug fixes, patches and unspecified upgrades on a
when-and-if-available basis, is offered under renewable, fee-based contracts. We
initially defer PCS revenue and recognize it ratably over the life of the PCS
contract as there is no discernable pattern of delivery related to these
promises. We do not provide unspecified upgrades on a set schedule and addresses
customer requests for technical support if and when they arise, with the related
expenses recognized as incurred. PCS contracts generally have a term of one to
three years. We include billed but unearned PCS revenue in deferred revenue.
Contracts with Multiple Performance Obligations
Most of our contracts with customers, other than renewals of PCS, contain
multiple performance obligations with a combination of products and PCS.
Products and PCS generally qualify as distinct performance obligations. Our
hardware includes EOS software, which together deliver the essential
functionality of our products. For contracts which contain multiple performance
obligations, we allocate revenue to each distinct performance obligation based
on the standalone selling price ("SSP"). Judgment is required to determine the
SSP for each distinct performance obligation. We use a range of amounts to
estimate SSP for products and PCS sold together in a contract to determine
whether there is a discount to be allocated based on the relative SSP of the
various products and PCS.
If we do not have an observable SSP, such as when we do not sell a product or
service separately, then SSP is estimated using judgment and considering all
reasonably available information such as market conditions and information about
the size and/or purchase volume of the customer. We generally use a range of
amounts to estimate SSP for individual products and services based on multiple
factors including, but not limited to the sales channel (reseller, distributor
or end customer), the geographies in which our products and services are sold,
and the size of the end customer.
We limit the amount of revenue recognition for contracts containing forms of
variable consideration, such as future performance obligations,
customer-specific returns, and acceptance or refund obligations. We include some
or all of an estimate of the related at risk consideration in the transaction
price only to the extent that it is probable that a significant reversal in the
amount of cumulative revenue recorded under each contract will not occur when
the uncertainties surrounding the variable consideration are resolved.
Most of our contracts with customers have payment terms of 30 days with
some large high volume customers having terms of up to 60 days. We have
determined our contracts generally do not include a significant financing
component because the Company and the customer have specific business reasons
other than financing for entering into such contracts. Specifically, both we and
our customers seek to ensure the customer has a simplified way of purchasing
Arista products and services.
We account for multiple contracts with a single partner as one arrangement if
the contractual terms and/or substance of those agreements indicate that they
may be so closely related that they are, in effect, parts of a single contract.
We may occasionally accept returns to address customer satisfaction issues even
though there is generally no contractual provision for such returns. We estimate
returns for sales to customers based on historical returns rates applied against
current-period shipments. Specific customer returns and allowances are
considered when determining our sales return reserve estimate.
Our policy applies to the accounting for individual contracts. However, we have
elected a practical expedient to apply the guidance to a portfolio of contracts
or performance obligations with similar characteristics so long as such
application would not differ materially from applying the guidance to the
individual contracts (or performance obligations) within that portfolio.
Consequently, we have chosen to apply the portfolio approach when possible,
which we do not believe will happen frequently. Additionally, we will evaluate a
portfolio of data, when possible, in various situations, including accounting
for commissions, rights of return and transactions with variable consideration.

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We report revenue net of sales taxes. We include shipping charges billed to
customers in revenue and the related shipping costs are included in cost of
product revenue.
Inventory Valuation and Contract Manufacturer/Supplier Liabilities
Inventories primarily consist of finished goods and strategic components,
primarily integrated circuits. Inventories are stated at the lower of cost
(computed using the first-in, first-out method) and net realizable value.
Manufacturing overhead costs and inbound shipping costs are included in the cost
of inventory.  We record a provision when inventory is determined to be in
excess of anticipated demand, or obsolete, to adjust inventory to its estimated
realizable value.
Our contract manufacturers procure components and assemble products on our
behalf based on our forecasts. We record a liability and a corresponding charge
for non-cancellable, non-returnable purchase commitments with our contract
manufacturers or suppliers for quantities in excess of our demand forecasts or
that are considered obsolete due to manufacturing and engineering change orders
resulting from design changes.
We use significant judgment in establishing our forecasts of future demand and
obsolete material exposures. These estimates depend on our assessment of current
and expected orders from our customers, product development plans and current
sales levels. If actual market conditions are less favorable than those
projected by management, which may be caused by factors within and outside of
our control, we may be required to increase our inventory write-downs and
liabilities to our contract manufacturers and suppliers, which could have an
adverse impact on our gross margins and profitability. We regularly evaluate our
exposure for inventory write-downs and adequacy of our contract manufacturer
liabilities.
Income Taxes
Income tax expense is an estimate of current income taxes payable in the current
fiscal year based on reported income before income taxes. Deferred income taxes
reflect the effect of temporary differences and carryforwards that we recognize
for financial reporting and income tax purposes.
We account for income taxes under the liability approach for deferred income
taxes, which requires recognition of deferred income tax assets and liabilities
for the expected future tax consequences of events that have been recognized in
our consolidated financial statements, but have not been reflected in our
taxable income. Estimates and judgments occur in the calculation of certain tax
liabilities and in the determination of the recoverability of certain deferred
income tax assets, which arise from temporary differences and carryforwards.
Deferred income tax assets and liabilities are measured using the currently
enacted tax rates that apply to taxable income in effect for the years in which
those tax assets are expected to be realized or settled. We regularly assess the
likelihood that our deferred income tax assets will be realized based on the
positive and negative evidence available. We record a valuation allowance to
reduce the deferred tax assets to the amount that we are more likely than not to
realize.
We believe that we have adequately reserved for our uncertain tax positions,
although we can provide no assurance that the final tax outcome of these matters
will not be materially different. To the extent that the final tax outcome of
these matters is different than the amounts recorded, such differences will
affect the provision for income taxes in the period in which such determination
is made and could have a material impact on our financial condition and results
of operations. The provision for income taxes includes the effects of any
reserves that we believe are appropriate, as well as the related net interest
and penalties.
We regularly review our tax positions and benefits to be realized. We recognize
tax liabilities based upon our estimate of whether, and to the extent to which,
additional taxes will be due when such estimates are more likely than not to be
sustained. An uncertain income tax position will not be recognized if it has
less than a 50% likelihood of being sustained. We recognize interest and
penalties related to income tax matters as income tax expense.
Loss Contingencies
In the ordinary course of business, we are a party to claims and legal
proceedings including matters relating to commercial, employee relations,
business practices and intellectual property. In assessing loss contingencies,
we use significant judgment and assumptions to estimate the likelihood of loss,
impairment of an asset or the

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incurrence of a liability, as well as our ability to reasonably estimate the
amount of loss. We record a provision for contingent losses when it is both
probable that an asset has been impaired or a liability has been incurred and
the amount of the loss can be reasonably estimated. We will record a charge
equal to the minimum estimated liability for litigation costs or a loss
contingency only when both of the following conditions are met: (i) information
available prior to issuance of our consolidated financial statements indicates
that it is probable that a liability had been incurred at the date of the
financial statements and (ii) the range of loss can be reasonably estimated. We
regularly evaluate current information available to us to determine whether such
accruals should be adjusted and whether new accruals are required.
Recent Accounting Pronouncements
Refer to "Recent Accounting Pronouncements" in Note 1. Organization and Summary
of Significant Accounting Policies of the Notes to Consolidated Financial
Statements included in Part II, Item 8, of this Annual Report on Form 10-K.

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