In a multicast network, what causes multicast traffic to not forward properly?

• A.The upstream router will receive the PIM Join message dropped
• B.Multi-router egress network, this router is not DR
• C.The router does not have an RPF route
• D.PIM is not enabled on the RPF interface

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Both the CSNP packet of ISlS and the DD packet of OSPF have a role in the MA network, describing the role of the link state database summary, which is correct compared to the following statements of these two types of messages

• A.OSPF is not identity bound to dr/BDR; the CSN message is generated only by DIS
• B.Once the adjacency relationship is established, the CSRP packet and the D message will stop sending
• C.The two packets do not need to be confirmed to the router after they are sent the master-slave relationship in the DD message interaction of
• D.Both packets need to be confirmed to the terminal router after being sent, otherwise they need to be retransmitted

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Which of the following statements aboutprefix segments and adjacency segmentsare correct?

• A.A prefix SID is a local SID out of the SRGB range.
• B.An adjacency SID is an offset value within the SRGB range advertised by the source end.
• C.A prefix segment identifies the prefix of a destination address on a network.
• D.An adjacency segment identifies an adjacency on a network.

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Regarding the Stub region in the OSPF protocol , the following statement is correct.

• A.Injecting typeT LSA
• B.backbone areas that are not allowed in Stub regions cannot be configured as Stub regions.
• C.ASBR cannot exist in the Stub zone
• D.Virtual connections cannot traverse the Stub region.

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In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network.

• A.TRUE
• B.FALSE

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