When troubleshooting a network, if you need to confirm the service traffic path, which of the following may need to be done? (Multiple choice)

• A.Confirm the network layer service traffic path
• B.Confirm the frequency of failure
• C.Confirm the data link layer service traffic path
• D.Investigate the service traffic path planning in the network design stage

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Which of the following reasons may cause a BGP neighbor relationship failure? (Multiple choice)

• A.The loopback interface is used to establish EBGP neighbors without peer ebgp-max-hop configured
• B.The peer connect-interface is not configured when establishing neighbors through the loopback port
• C.Conflicting router IDs of neighbors
• D.ACL filters TCP port 179

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In the vAR application scenario, which functions of the AR router can be virtualized on the server? (Multiple choice)

• A.VOIP
• B.Firewall
• C.VPN
• D.NAT

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As shown in the figure, the operator's BGP MPLS IP VPN backbone network constructs SP through DP. If the two sites of user X are to communicate through the BGP MPLS IP VPN network, PE1 and PE2 must use a 32-bit mask Loopback interface address to establish MP-IBGP peer relationship.

• A.FALSE
• B.TRUE

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In the test phase of the cutover, the criteria for indicating that the test has been completed are:

• A.The network is based on the normal test of my upper-layer application business
• B.The configuration view result of the IP device is normal as the standard
• C.It is standard to check that the network is running normally
• D.Test that the network service is normal as the standard

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