In a multicast network, which of the following situations will cause forwarding failure of multicast traffic? (Multiple Choice)

• A.On a network with multiple egress routers, the router is not selected as the DR.
• B.The upstream router discards the received PIM Join messages.
• C.Router does not have RPF routing.
• D.PIM is not enabled on an RPF interface.

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In Huawei device, when ISIS imports external routes and sets external route tags for routing information, the ISIS metric type does not need to be modified to keep the default.

• A.False
• B.True

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

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As shown in the figure, the router load balances the traffic between the branch network 1 and the branch network 2. In this case, the URPP defense source P address spoofing attack must be configured in the loose mode on the physical interface of the router.

• A.True
• B.False

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A network consisting of an existing router R1, router R2, router R3 and router R4. These four routers are interconnected via a LAN network. Basic OSPF is deployed on all four routers. When you execute the command "display ospf peer" on the router R2, the status between router R2 and router R3 is "2way".
What conclusion can you draw from this output?

• A.Router R2 is not DR
• B.Router R3 is not DR, nor BDR
• C.Router R2 is DR or BDR
• D.There is no full adjacency between router R2 and router R3.
• E.Router R4 is DR

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