In the intra-domain MPLS VPN network, when the data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Regarding the description of the two layers of labels, which of the following options is wrong?

• A.The outer label is used to correctly send the data packet to the corresponding VPN on the PE device
• B.The outer label of MPLS VPNE is called the private network label, and the inner label is called the public network label.
• C.The outer label of MPLS VPN is allocated by the LDP protocol or statically, and the inner label is allocated by the MP-BGP neighbor at the correct end.
• D.By default, the outer label is singled out before the packet is forwarded to the last hop device

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Which of the following statements about the freeway of LDP label retention is correct? (Multiple choice)

• A.Only keep labels from next-hop neighbors, discard all labels sent by non-next-hop neighbors
• B.Need more memory and label space
• C.Keep all labels distributed by neighbors
• D.Save memory and label space

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In BGPIMPLS IP VPN, if the OSPF protocol is used to exchange routing information between PE and CE, the domain identifier (Domain ID) is used to distinguish whether the routes imported in the VPI instance are from the same OSPF domain.

• A.TRUE
• B.FALSE

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Which of the following reasons may cause the hosts in the same VLAN of the LAN to fail to communicate? (Multiple choice)

• A.Wrong port and MAC address binding is configured on the switch
• B.Port isolation is configured on the switch
• C.The interface is manually shut down or the physical interface is damaged
• D.Switch MAC address learning error

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How to view log information? (Multiple choice)

• A.Log in to the device and view it through the display log
• B.Transfer the log file under flash:/logfile/ to the PC via FIP/TFTP
• C.View the interface of the network management system
• D.There is no way

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