<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001672685</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001596532</issuerCik>
            <issuerName>ARISTA NETWORKS INC</issuerName>
            <secFileNumber>001-36468</secFileNumber>
            <issuerAddress>
                <ns2:street1>5453 Great America Parkway</ns2:street1>
                <ns2:city>Santa Clara</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>95054</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>4085475000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MARC TAXAY</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>1248</noOfUnitsSold>
            <aggregateMarketValue>479007.36</aggregateMarketValue>
            <noOfUnitsOutstanding>314152875</noOfUnitsOutstanding>
            <approxSaleDate>10/01/2024</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>10/01/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1248</amountOfSecuritiesAcquired>
            <paymentDate>10/01/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for MARC TAXAY</name>
                <address>
                    <ns2:street1>5453 Great America Parkway</ns2:street1>
                    <ns2:city>Santa Clara</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95054</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/03/2024</saleDate>
            <amountOfSecuritiesSold>4497</amountOfSecuritiesSold>
            <grossProceeds>1512432.10</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for MARC TAXAY</name>
                <address>
                    <ns2:street1>5453 Great America Parkway</ns2:street1>
                    <ns2:city>Santa Clara</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95054</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>08/01/2024</saleDate>
            <amountOfSecuritiesSold>628</amountOfSecuritiesSold>
            <grossProceeds>220114.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.&#13;
</remarks>
        <noticeSignature>
            <noticeDate>10/01/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/13/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Marc Taxay</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4971}]
144
0001672685
XXXXXXXX
LIVE
0001596532
ARISTA NETWORKS INC
001-36468
5453 Great America Parkway
Santa Clara
CA
95054
4085475000
MARC TAXAY
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
1248
479007.36
314152875
10/01/2024
NYSE
Common
10/01/2024
Exercise of Stock Options
Issuer
N
1248
10/01/2024
Cash
N
10b5-1 Sales Plan for MARC TAXAY
5453 Great America Parkway
Santa Clara
CA
95054
Common
09/03/2024
4497
1512432.10
10b5-1 Sales Plan for MARC TAXAY
5453 Great America Parkway
Santa Clara
CA
95054
Common
08/01/2024
628
220114.00
The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
10/01/2024
09/13/2023
/s/ Marc Taxay