In the network shown in the figure, R1, R2, R4, and R5 run IS-IS, and the area number is
49.0001. R3 and R6 run IS-IS, and the area number is 49.0002. Within AS 65000, R1, R3, R4, and R6 all establish IBGP neighbor relationships with R2 and R5, where R2 and R5 are RRs and R1, R4, R3, and R6 are clients. IBGP neighbor relationships are all established using the Loopback0 interface. R2 and R5 also establish an IBG neighbor relationship. The IP address of the Loopback0 interface of each device is 10.0.X.X/32, and the Router ID is 10.0.XX, where X is the device number. R1 and R4 introduce the external network 192.168.0/24 into BGP through import.

For 192.168.1.0/24, match the number of valid routes in the display bgp routing-table output.

Network engineers can determine whether the link connection is normal by observing the interface indicators of the NetEngine AR6120 on site, but cannot determine whether the interface is configured with an IP address.

A network engineer uses the capture-packet tool to capture the message received by the interface. The figure shows some output information. What protocol does this message belong to?

When an IP packet enters the MPLS domain, the ingress node checks the Tunnel ID corresponding to the destination IP address. When the Tunnel ID is one of the following, the ingress node performs IP forwarding on the packet?

In the IS-IS IPv6 network shown in the figure, all routers have multi-topology enabled. The IPv6 address of the R4 Loopback0 interface is 2000::4/128, and "ipv6 summary 2000::64 level-1-2" is configured in the R4 IS-IS process.

Which of the following is wrong in the default case?