<?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>0001701967</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>1999 McCool Family Trust</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>1164</noOfUnitsSold>
            <aggregateMarketValue>446766.48</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>1164</amountOfSecuritiesAcquired>
            <paymentDate>10/01/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST</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>584</amountOfSecuritiesSold>
            <grossProceeds>205036.56</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST</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>08/21/2024</saleDate>
            <amountOfSecuritiesSold>2575</amountOfSecuritiesSold>
            <grossProceeds>912531.33</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST</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>588</amountOfSecuritiesSold>
            <grossProceeds>206094.00</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>09/08/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ John F McCool, Trustee</signature>
        </noticeSignature>
    </formData>
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144
0001701967
XXXXXXXX
LIVE
0001596532
ARISTA NETWORKS INC
001-36468
5453 Great America Parkway
Santa Clara
CA
95054
4085475000
1999 McCool Family Trust
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
1164
446766.48
314152875
10/01/2024
NYSE
Common
10/01/2024
Exercise of Stock Options
Issuer
N
1164
10/01/2024
Cash
N
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
09/03/2024
584
205036.56
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
08/21/2024
2575
912531.33
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
08/01/2024
588
206094.00
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
09/08/2023
/s/ John F McCool, Trustee