You should read the following discussion and analysis of our financial
condition and results of operations together with the unaudited condensed
consolidated financial statements and related notes that are included elsewhere
in this Quarterly Report on Form 10-Q, and our Annual Report on Form 10-K filed
with the SEC on February 14, 2020. 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 Quarterly
Report on Form 10-Q.
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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 to invest in our sales
activities in key geographies, as well as in 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 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 collectively represented 40% of our revenue, and benefited from
certain factors that are not expected to repeat in fiscal 2020. Consequently,
the percentage of our revenue from these customers in fiscal 2020 is expected to
decline, which will contribute to an expected year-over-year decline in our
revenue for fiscal 2020. 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.
Recent Developments
  The global coronavirus ("COVID-19") pandemic and related shelter in place,
travel and social distancing restrictions imposed by governments around the
world in an effort to contain or slow its spread have negatively impacted the
global economy, disrupted business, sales activities, supply chains and
workforce participation, including our own, and created significant volatility
and disruption of financial markets, and we expect that the global health crisis
caused by COVID-19 will continue to negatively impact business activity for the
foreseeable future.
  We have taken numerous steps, and will continue to take further actions, in
our approach to address COVID-19. We have prioritized the protection of our
employees during this pandemic and, as a result, have closed our offices across
the globe (including our corporate headquarters) limiting access to only those
employees providing essential activities, instructed employees to work from
home, and implemented travel restrictions. We continue to work closely with our
contract
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manufacturers and supply chain partners who have experienced delays in component
sourcing, workforce disruptions and governmental restrictions on the production
and export of their products. Although we have worked diligently to drive
improvements in these areas, including funding additional working capital and
incremental purchase commitments, these delays have negatively impacted our
ability to supply products to our customers on a timely basis. We expect to
continue to invest in working capital as supply availability improves in order
to address the risk of future COVID-19 related supply chain disruptions, but we
cannot be certain that such disruptions will not occur.
  The extent of the impact of COVID-19 on our operational and financial
performance, including our ability to execute our business strategies and
initiatives in the expected time frame, will depend on future developments,
including the duration and spread of the pandemic, the breadth and duration of
governmental containment measures such as shelter in place, travel and social
distancing restrictions as well as the reauthorization of or increase in such
measures in the event of spikes in COVID-19 infection rates, and the impact on
our customers, partners, contract manufacturers and supply chain, all of which
are uncertain and cannot be predicted. However, any continued or renewed
disruption in manufacturing and supply resulting from the COVID-19 pandemic or
related containment measures would negatively impact our business. We also
believe that any extended or renewed COVID-19 related economic disruption could
have a negative impact on demand from our customers in future periods. While we
have experienced some incremental improvement in demand from our cloud titan
customers and some stabilization in sales activity in our campus and enterprise
markets in the period, we continue to expect a year-over-year decline in total
revenue for the year ending December 31, 2020. Accordingly, current results and
financial condition discussed herein may not be indicative of future operating
results and trends.
  In response to potential future COVID-19 related disruptions to our business,
we have continued to carefully review our investment and spending plans,
cautiously reintroducing some incremental spending beginning in the third
quarter as overall customer demand began to stabilize. Although management is
actively monitoring the impact of COVID-19 on the Company's financial condition,
liquidity, operations, suppliers, industry, and workforce, the full impact of
the pandemic continues to evolve as of the date of this report. As such, the
Company is unable to estimate the effects of COVID-19 on its future results of
operations, financial condition, or liquidity.
Acquisitions
  On February 5, 2020, we acquired Big Switch Networks, Inc. ("Big Switch"), a
network monitoring and software-defined networking pioneer headquartered in
Santa Clara, California. With the acquisition of Big Switch, we expect to expand
our data center networking solutions and further strengthen our network
monitoring and observability suite delivered through Arista's software platform
CloudVision and DANZ (DataANalyZer) capabilities. In addition, on October 7,
2020, we completed the acquisition of Awake Security Inc. ("Awake Security"), a
network detection and response ("NDR") platform provider headquartered in Santa
Clara, California. With the acquisition of Awake Security, we are adding an NDR
platform to our product portfolio that combines artificial intelligence (AI)
with human expertise to autonomously hunt for and respond to insider and
external threats.

Results of Operations
Three and Nine Months Ended September 30, 2020 Compared to Three and Nine Months
Ended September 30, 2019
Revenue, Cost of Revenue and Gross Profit (in thousands, except percentages)
                                            Three Months Ended September 30,                                               Nine Months Ended September 30,
                              2020                2019                     Change in                       2020                 2019                       Change in
                               $                   $                  $                  %                  $                    $                    $                  %
Revenue
Product                  $   480,242          $ 555,066          $ (74,824)            (13.5) %       $ 1,312,561          $ 1,573,652          $ (261,091)            (16.6) %
Service                      125,189             99,349             25,840              26.0              356,469              284,508              71,961              25.3
Total revenue                605,431            654,415            (48,984)             (7.5)           1,669,030            1,858,160            (189,130)            (10.2)
Cost of revenue
Product                      199,465            218,220            (18,755)             (8.6)             539,526              616,906             (77,380)            (12.5)
Service                       21,004             18,921              2,083              11.0               62,202               53,219               8,983              16.9
Total cost of
revenue                      220,469            237,141            (16,672)             (7.0)             601,728              670,125             (68,397)            (10.2)
Gross profit             $   384,962          $ 417,274          $ (32,312)             (7.7) %       $ 1,067,302          $ 1,188,035          $

(120,733)            (10.2) %
Gross margin                    63.6  %            63.8  %                                                   63.9  %              63.9  %



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Revenue by Geography (in thousands, except percentages)
                                                     Three Months Ended September 30,                                                              

Nine Months Ended September 30,


                                 2020                 % of Total               2019              % of Total                   2020                   % of Total                2019               % of Total
Americas                   $      452,693                   74.8   %       $ 532,318                   81.4   %       $    1,289,182                       77.2   %       $ 1,418,325                   76.3   %
Europe, Middle East
and Africa                         89,588                   14.8              75,439                   11.5                  226,189                       13.6               298,768                   16.1
Asia-Pacific                       63,150                   10.4              46,658                    7.1                  153,659                        9.2               141,067                    7.6
Total revenue              $      605,431                  100.0   %       $ 654,415                  100.0   %       $    1,669,030                      100.0   %       $ 1,858,160                  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 decreased $74.8 million, or 13.5%, and $261.1 million, or
16.6%, for the three and nine months ended September 30, 2020, respectively,
compared to the same periods in 2019. The decrease of $74.8 million was
primarily driven by reduced sales on a year-over-year basis to our larger
customers, combined with some COVID-19 related supply constraints in fiscal
2020. The decrease of $261.1 million was primarily the result of the recognition
of $116.8 million of deferred revenue related to customer acceptance of prior
period sales transactions in the nine months ended September 30, 2019 combined
with some reduction in sales to our larger customers in the period, and the
impact of COVID-19 related supply constraints. Service revenue increased $25.8
million, or 26.0%, and $72.0 million, or 25.3%, in the three and nine months
ended September 30, 2020, compared to the same periods in 2019, as a result of
continued growth in support contracts as our customer installed base has
continued to expand. International revenues represented 25.2% and 22.8% of total
revenues in the three and nine months ended September 30, 2020, respectively, an
increase from 18.6% and a decrease from 23.7% compared to the same periods in
the prior year. International revenues generally fluctuate based on the timing
of deployments by certain of our large end customers. In addition, the increase
in the current quarter was mainly due to an increase in demand in both our EMEA
and Asia-Pacific regions. We continued to experience competitive pricing
pressure on our products and services.
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.
Costs of providing PCS and other services primarily consist of personnel costs
for our global customer support organization.
  Cost of revenue decreased $16.7 million, or 7.0%, and $68.4 million, or 10.2%,
for the three and nine months ended September 30, 2020, respectively, compared
to the same periods in 2019. These decreases were primarily driven by a
corresponding decrease in revenue.
  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 and obsolete inventory
write-downs, including charges for excess and 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 remained consistent for the three and nine months ended September
30, 2020, compared to the same periods in 2019. Gross margin in each period was
unfavorably impacted by incremental COVID-19 related supply chain costs combined
with some relatively fixed overhead costs on a lower revenue base.
Operating Expenses (in thousands, except percentages)
  Our operating expenses consist of research and development, sales and
marketing, and general and administrative 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.
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                                                      Three Months Ended September 30,                                                  Nine Months Ended September 30,
                                         2020                   2019                     Change in                        2020                   2019                    Change in
                                          $                      $                  $                 %                     $                     $                  $                %
Operating expenses:
Research and development         $    128,049               $ 118,732
   $  9,317               7.8  %       $    352,747              $ 352,696          $     51                -  %
Sales and marketing                    53,372                  55,279            (1,907)             (3.4)              161,695                159,372             2,323              1.5
General and administrative             15,146                  14,657               489               3.3                47,814                 46,182             1,632              3.5

Total operating expenses         $    196,567               $ 188,668          $  7,899               4.2  %       $    562,256              $ 558,250          $  4,006              0.7  %


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
plan to continue 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 $9.3 million, or 7.8% in the three
months ended September 30, 2020 compared to the same period in 2019. The
increase was primarily due to an increase of $3.7 million in new product
introduction costs in the current period combined with an increase of $5.6
million in personnel costs, which included an increase in stock-based
compensation costs of $8.0 million, partially offset by a decrease in corporate
bonus expense. For the nine months ended September 30, 2020, research and
development expenses remained relatively constant compared to the same period in
2019, resulting from an increase of $5.6 million in personnel costs, an increase
of $7.3 million in acquisition-related costs, and an offsetting decrease of
$12.8 million in new product introduction costs in the nine months ended
September 30, 2020.
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 continue to prudently manage
our sales and marketing spend in fiscal 2020 with some targeted investment in
strategic sales activities and, accordingly, expect a marginal increase in sales
and marketing expenses in fiscal 2020 compared to fiscal 2019.
  Sales and marketing expenses decreased $1.9 million, or 3.4%, for the three
months ended September 30, 2020 compared to the same period in 2019. The
decrease primarily resulted from COVID-19 related reductions in marketing and
travel expenses, partially offset by increased salaries and stock-based
compensation due to increased headcount. The increase of $2.3 million, or 1.5%,
in the nine months ended September 30, 2020 compared to the same period in 2019,
was primarily driven by an increase in salaries and stock-based compensation due
to increased headcount, and an increase of $3.7 million in acquisition-related
expenses. This increase was partially offset by a reduction in travel expenses
and other sales and marketing activities due to COVID-19.
General and administrative
  General and administrative expenses consist primarily of personnel costs and
professional services fees. General and administrative personnel costs include
those for our executive, finance, human resources and legal functions. Our
professional services fees are primarily due to external legal, accounting and
tax services.
  General and administrative expenses increased $0.5 million, or 3.3%, in the
three months ended September 30, 2020, and $1.6 million, or 3.5%, in the nine
months ended September 30, 2020 compared to the same periods in 2019. The
increase in each period was primarily due to acquisition-related expenses,
partially offset by lower personnel costs. In addition, litigation-related costs
decreased in the three and nine months ended September 30, 2020 due to the
settlement of our litigation with Optumsoft in December 2019.
Other Income, Net (in thousands, except percentages)
  Other income 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. We
expect that interest income from our fixed-income marketable securities will
decline for the year ending December 31, 2020 as a result of lower interest
rates in 2020 compared to 2019 and the sale of marketable securities in the
three months ended September 30,
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2020. In addition, we expect other income may fluctuate in the future as a
result of the re-measurement of our private company equity investments upon the
occurrence of observable price changes and/or impairments, changes in returns on
our cash and cash equivalents and marketable securities, and foreign currency
exchange rate fluctuations.
                                                       Three Months Ended September 30,                                              Nine Months Ended September 30,
                                          2020               2019                     Change in                        2020                 2019                     Change in
                                           $                   $                 $                 %                    $                     $                 $                  %
Other income, net:
Interest income                      $     4,319          $ 13,446          $ (9,127)            (67.9) %       $    24,649              $ 38,451          $ (13,802)            (35.9) %
Gain on sale of marketable
securities                                 9,432                 -             9,432             100.0                9,432                     -              9,432             100.0
Gain on investments in
privately-held companies                       -             4,277            (4,277)           (100.0)                   -                 5,427             (5,427)           (100.0)
Other income (expense), net                 (527)            1,446            (1,973)           (136.4)                (444)                1,435             (1,879)           (130.9)
Total other income, net              $    13,224          $ 19,169          $ (5,945)            (31.0) %       $    33,637              $ 45,313          $ (11,676)            (25.8) %


  The unfavorable change in Other income, net, during the three and nine months
ended September 30, 2020 as compared to the same periods in 2019 was primarily
driven by a decrease in interest income from our fixed-income marketable
securities caused by reduced interest rates. In addition, we recorded a gain on
our investments in privately-held companies in the nine months ended September
30, 2019, which did not recur in the current period. The decrease in each period
was partially offset by a realized gain of $9.4 million from the sale of our
marketable securities in the three months ended September 30, 2020.
Provision for 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.
                                                Three Months Ended September 30,                                             Nine Months Ended September 30,
                                  2020                2019                     Change in                      2020               2019                      Change in
                                   $                   $                  $                  %                 $                  $                   $                  %

Income before income $ 201,619 $ 247,775 $ (46,156)

            (18.6) %       $ 538,683          $ 675,098          $ (136,415)            (20.2) %

taxes


Provision for income              33,244             38,880             (5,636)            (14.5) %          87,084             75,923              11,161              14.7  %
taxes
Effective tax rate                  16.5  %            15.7  %                                                 16.2  %            11.2  %


  For the three and nine months ended September 30, 2020, we recorded expenses
of $33.2 million and $87.1 million for income taxes, respectively. For the three
and nine months ended September 30, 2019, we recorded expenses of $38.9 million
and $75.9 million, respectively. Income taxes for the three and nine months
ended September 30, 2020 were attributable to the overall decrease in worldwide
earnings offset by lower tax benefits realized from stock-based compensation.

Liquidity and Capital Resources

Our principal sources of liquidity are cash, cash equivalents, marketable securities, and cash generated from operations. As of September 30, 2020, our total balance of cash, cash equivalents and marketable securities was approximately $2.8 billion, of which approximately $409.5 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
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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 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.

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