The router HW1 exists as an MPLS LSR router in the network of the operator HW. The router receives a packet carrying a label, but the label entry does not exist in its LFIB.
So how does the router handle the message?

• A.Router HW1 will discard the message.
• B.Router HW1 will forward the message using the default label.
• C.Router HW1 will strip the label and find the IP destination address of the FIB.
• D.Router HW1 uses LDP to create an LSP and creates a new path for the label carried in the packet in the LFIB.

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Which of the following statements are correct about IPsec VPN? (Multiple Choice)

• A.An OSPF neighbor relationship can be established between two routers through an IPsec VPN tunnel, and the intranet is exchanged.
• B.Aggressive mode can support NAT traversal, while main mode does not support NAT traversal.
• C.Two routers establish IPsec VPN through the aggressive mode, then only two packets are exchanged between the two devices to establish a tunnel.
• D.Two routers establish IPsec VPN through the main mode. Starting from the fifth message (inclusive), the payload data is often encrypted.

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Between the two directly connected devices that have established IBGP neighbor, run the shutdown command to shut down the interface of one of the devices. The BGP connection will not be disconnected immediately.

• A.True
• B.False

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A number of transition techniques have emerged in the process of replacing a P4 address used in a network with a Pv6 address. These technologies are divided into two categories, one is PV4/IPv6 coexistence technology and the other is v4/P6 interworking technology. Which of the following options belong to Pv4/IP6 coexistence technology? (Multiple Choice)

• A.IPv6 over IPv4
• B.NAT64
• C.Dual-Stack
• D.ISATAP

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When ISIS area authentication is configured, which ISIS packet can carry the authentication information?

• A.Level-2 SNP and LSP of ISIS
• B.Level-2 Hello packet of ISIS
• C.Level-1 Hello message of ISIS
• D.Level-1 SNP and LSP of ISIS

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