In Rapid Spanning Tree Protocol (RSTP), which port provides a backup path to the root bridge and which state should this port be in?

• A.Root port/listening
• B.Designated port/learning
• C.Alternate port/forwarding
• D.Alternate port/discarding
• E.Alternate port/learning

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Which of the following belong to single package attack? (Multiple Choice)

• A.DDoS attack
• B.Malformed package attack
• C.Special control package attack
• D.Scanning detection attack

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Router R1 runs the 0SPF protocol. Use the display ip routing-table command to view the routing table of the Router R1. Which of the following description is correct about the 0SPF information in the routing table?

• A.In the routing table, the routing entry identified by the "0SPF" identifier can only pass the LSA of class 1.
• B.In the routing table, the routing entries identified by the OSPF identifier can be learned through 1/2/3/5 LSAs.
• C.In the routing table, the routing entries identified by the "0SPF" identifier can only be learned through the Type 3 LSA.
• D.In the routing table, the routing entries identified by the "0_ASE" identifier can only be learned through routing.

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The Type 5 LSA in OSPF is used to pass external routes. Which of the following statement about the five Type 5 LSA is wrong?

• A.The FA address is included in the Type 5 LSA, and the FA address is 0.0.0.0, but has no practical effect as a reservation.
• B.Configure the corresponding policies on the ABR and ASBR to filter the Type 5 LSA.
• C.The router in the same area as the ASBR can calculate the external route through the intra-area LSA and the Type 5 LSA.
• D.The Type 5 LSA is advertised by the ASBR and flooded in the OSPF network in the non-Stub/NSSA area.

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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.This router will ignore the LSP received from the neighbor.
• B.If it is a point-to-point network, this router will send PSNP
• 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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