In multicast network, what happens to multicast traffic that cannot be forwarded normally? (Multiple choice)

• A.The upstream router discards the received PIM Join message.
• B.PIM is not enabled on the RPF interface.
• C.The router does not have RPF routes.
• D.Multi-router exit network, this router is not DR

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HW users are transmitting a lot of files through TFTP. What protocol does TFTP rely on for transmission?

• A.UDP
• B.FTP
• C.IP and TCP
• D.NFS
• E.IcmP and UDP

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In the process of using the LACP protocol, which of the following description is correct? (Multiple choice)

• A.You can add member interfaces to the enabled link aggregation group by using the following command: interface Gigabitethernet0/0/1 shutdown interface Gigabitethernet0/0/1 trunkport Gigabitethernet0/0/ interface Gigabitethernet0/0/1 undo shutdown
• B.You can remove a member interface in an enabled link aggregation group by using the following command: interface Gigabitethemnet0/0/0 shutdown interface Gigabitethernet0/0/1 undo eth-trunk 1 interface Gigabitetheret0/0/ undo shutdown
• C.You can configure the source IP address for load balancing in the enabled link aggregation group by using the following command: interface eth-trunk 1 load-balance src-dst-ip
• D.You can prevent the Eth-Trunk interface from frequently oscillating due to physical link by using the following command: interface eth-trunk 1 lacp preempt enable lacp preempt delay delay-time

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In order to reduce the number of OSPF routes in some stub areas, OSPF has developed a special area function. Which of the following description about the OSPF special area is correct?

• A.Special area routers cannot establish OSPF neighbor relationships with regular area routers.
• B.As -External-lsa is released to the Stub area
• C.Any OSPF area can be configured as a special area.
• D.ASBR-Summary-LSA is allowed to be advertised to the NSSA area.

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Both ISIS CSNP packets and OSPF DD packets are in the MA network, describing the role of the link state database profile. Which of the following statements is correct?

• A.Once the adjacency relationship is established, CSNP packets and DD packets will stop sending.
• B.Both routers need to confirm the two routers after sending them. Otherwise, they need to be retransmitted.
• C.The two routers do not need to confirm the peer router after sending.
• D.The master-slave relationship in the DD packet exchange of OSPFA is not bound to the DR/BDR. The CSNP packet is generated only by the DIS.

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