In PIM-SM, which of the following descriptions of the PIM Join message is correct?

• A.The PIM Join message is sent every 60 seconds to refresh the status of the upstream router mroute for the multicast tree
• B.The upstream router sends a PIM Join confirmation in response to each PIM Join message received from the downstream router
• C.The PIM Join message is only sent when the multicast tree is established for the first time
• D.The PIM Join message is sent every 3 minutes to show the status of the new upstream router mroute for the multicast tree

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ISIS protocol is in broadcast network and P2P network, when the router receives the LSP, it needs to use PSNP to confirm and ensure the synchronization of the LSDB.

• A.False
• B.True

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What is the correct statement about the difference between OSPFv2 and OSPFv3? (Multiple Choice)

• A.The protocol number of OSPFv2 in the IPv4 packet header is 89, and the next header number of OSPFv3 in the IPv6 packet header is 89
• B.OSPFv2 and OSPFv3 have the same types of messages: Hello, DD, LSR, LSU, LSA ack, and their message formats are the same
• C.OSPFv3 is similar to OSPFv2 in that it uses a multicast address as the destination address of OSPF packets
• D.Both OSPFv2 and OSPFv3 support interface authentication, and OSPFv3 authentication is still implemented based on the fields in the OSPF message header

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An existing router running OSPF is connected to Zone 0 and Zone 1. You configure zone 1 as a stub area. What types of LSA are only operating inside Zone 1?

• A.Type 7 LSA
• B.Type 1 LSA, Type 2 LSA and Type 5 LSA
• C.Type 1 LSA and Type 2 LSA
• D.Type 3 LSA and Type 4 LSA
• E.Type 1 LSA, Type 2 LSA and Type 3 LSA

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As shown in the figure, the ISIS overload bit is set in the configuration of router R3. Which of the following statements is correct? (Multiple Choice)

• A.The routes imported by R3 through import-route will not be advertised.
• B.R3 starts the load discussion state, R1 and R2 will not calculate the LSP generated by R3 in the SP tree.
• C.When the router memory is insufficient, the system automatically sets the overload flag in the sent LSP message, regardless of whether the user has configured the set-overload command.
• D.The direct route of R3 will be ignored by R1 and R2 because of the overload bit setting.
• E.The LSP of R3 will not spread to R1 and R2.

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