Regarding the special area of OSPF, which of the following description of is incorrect?

• A.The difference between a Totally Stub area and an NSSA area is that the Totally Stub area does not accept inter-area routing information.
• B.The Totally Stub Area allows the ABR to advertise the default Type 3 LSA, but does not accept the Type 5 LSA and the refined Type 3 LSA
• C.The NSSA Area is different from the Stub area because this area allows the import of autonomous system external routes, and the ABR advertises LSA7 notifications to this area.
• D.The difference between the Stub area and the Totally stub area is that the stub area allows detailed routing information between areas

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The route is injected into BGP through the network command. Which of the following description is wrong? (Multiple choice)

• A.The length of the mask must match exactly
• B.Just match the prefix, the length of the mask does not need to be strictly matched
• C.The route must exist in the IP routing table and is the best route
• D.The route cannot be an IGP route, it can only be a direct route

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Which of the following SA descriptions of various messages are wrong? (Multiple choice)

• A.LS Update message contains complete LSA information
• B.LS Ack message contains complete LSA information
• C.LS Request message only has LS Type, Ls ID and Advertising Router
• D.DD only contains the summary information of LSA, that is, it contains LS Type, LS ID, Advertising Router and LS Sequence Number

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In the MAC-based Portal authentication scenario, when a user successfully performs Portal authentication, he can disconnect from the network and reconnect within a certain period of time, and he can directly access through MAC authentication without entering the username and password to perform Porta1 authentication again.

• A.FALSE
• B.TRUE

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As shown in the figure, the stateful inspection firewall will forward the second TCP three-way handshake message in the figure.

• A.False
• B.True

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