Which of the following is the correct description of the Register message in PIM-SM? (Multiple choice)

• A.Register message enables the RP to learn multicast source information.
• B.Register message is sent by the source DR
• C.Register message is sent to the RP by unicast instead of multicast.
• D.Register message is sent by the receiver router

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Which of the following descriptions are true about the establishment process of LDP LSP? (Multiple Choice)

• A.In the label publishing DoD mode, for a specific FEC, the LSR does not need to obtain the label request message from the upstream to perform label distribution and distribution.
• B.The process of establishing an LSP is actually the process of binding the FEC to the label and advertising the binding to the upstream LSR of the LSP.
• C.When the network topology changes cause the next hop neighbor to change, the LSR can directly reestablish the LSP by using the label sent by the original non-optimal next hop neighbor.
• D.By default, the LSR is for the same FEC. The received label mapping can only come from the optimal next hop. It cannot be from the non-optimal next hop.

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About BGP Union, which of the following description is wrong?

• A.Sub-autonomous systems in the alliance can use private AS numbers. For Huawei NE/AR routers, an alliance can configure up to 32 sub-autonomous systems.
• B.The alliance divides an AS into several sub-ASs, and the AS outside the alliance still considers the alliance to be an AS.
• C.Alliance sub AS number, other than the default notice to the Union BGP peers.
• D.Union can easily be detected AS routing loop inside, because the sub- AS operation is between the EBGP.

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Regarding the description of IGMP Snooping, which is correct? (Multiple Choice)

• A.IGMP Snooping does not consume the CPU of the switch
• B.IGMP Snooping runs at the link layer and is a multicast restriction mechanism on the Layer 2 Ethernet switch, which is used to manage and control multicast groups
• C.IGMP Snooping builds a MAC multicast address table by monitoring IGMP messages sent by the host
• D.IGMP Snooping solves the problem of multicast packets broadcast at Layer 3

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ISIS IPv6 cost 50 is configured on the interface. What is the meaning of this command?

• A.IS-IS of the interface
• B.The IS-IS cost of the interface is both 50 and the cost is both 60

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