Which of the following description about verifying whether a received Hello message is legal is wrong?

• A.The RouterDeadIntera1 field in the received Hello message must be consistent with the configuration of the receiving port
• B.If the network type of the receiving port is broadcast, point-to-multipoint or NBMA, the Network Mask field in the received Hello message may be inconsistent with that of the interface.
• C.The E-bit in the Options field of the received Hello message must be consistent with the configuration of the relevant area
• D.If the network type of the receiving port is a point-to-point type or a virtual link, the Network Mask field is not checked

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The command to configure VRRP to track the state of the physical interface is.

• A.vrrp vrid 1 interface Gigabitethernet0/0/0
• B.track vrrp vrid 1 interface Gigabitethernet0/0/0
• C.vrrp vrid 1 interface Gigabitethernet0/0/0 track
• D.vrrp vrid 1 track interface Gigabitethernet0/0/0

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Which of the following description of roaming is correct? (Multiple choice)

• A.APs that implement wireless roaming must be in the same basic service set (BSS)
• B.APs that implement wireless roaming do not need to have signal coverage overlapping areas
• C.APs that implement wireless roaming must have signal coverage overlapping areas
• D.APs that implement wireless roaming must be in the same extended service set (ESS)

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Which of the following does not belong to the IGP?

• A.RIP
• B.OSPF
• C.IS-IS
• D.BGP

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