Which of the following is true about Smart-link? (Multiple Choice)

• A.Smart-link mainly includes two roles: primary port and slave port.
• B.Smart-link supports load sharing.
• C.Smart-link can be mixed with STP under the interface.
• D.Smart-link cannot detect the uplink and downlink status.

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Four routers R1, R2, R3, and R4 run ISIS, the ISIS router type is marked, and the routing table is viewed on R1. The reason why R1 does not reach the route of 10.34.34.4 is

• A.R2's system-ID conflicts with R3
• B.Regional planning errors for R3 and R4
• C.Configure a routing policy on R2 to filter the default route.
• D.R2's system-ID conflicts with R1

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What improvements have been made to the IGMPv2 protocol compared to IGMPv1? (Multiple Choice)

• A.Added specific source group query messages
• B.Added specific group query message
• C.Added off-group messages
• D.Added maximum response time field

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As shown in the following figure, in IPv4 and IPv6 environments the SEL value in an IS-IS NET address is always 00.

• A.Ture
• B.False

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As shown in the following figure, a part of the LSP of the LSDB of a router is shown in the first line of the figure. First received a new LSP, the second hop in the following picture, which of the following statement is wrong?

• A.If it is a point-to-point network, this router will send PSNP
• B.This router will ignore the LSP received from the neighbor.
• C.The router will put the newly received LSP into the LSDB.
• D.If it is a broadcast network, the DIS will include the summary information of the LSP in the next CSNP packet.

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