How does the IGMPv2 router maintain the network segment group membership? (Multiple choice)

• A.The router maintains a timeout timer for each group membership, refreshes the timer if it receives the receiver host, and deletes the group membership if the timer expires
• B.After receiving the leave message, the router immediately deletes the group membership
• C.The router periodically sends Query messages. The receiver host reports the Report message after receiving the Query message.
• D.The router will query a specific group

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BGP can only auto-aggregate routes whose source is Incomplete.

• A.True
• B.False

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The LAND attack is performed by the attacker sending a source address and a destination address to the destination host are the destination host, the same SYN packet on source port and the destination port. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

• A.False
• B.True

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Which of the following statement about the LSA of OSPFv3 3 is correct? (Multiple choice)

• A.Router-LSA and Network-LSA do not contain routing information.
• B.Inter-Area-Prefix LSA also contains Link-Local information
• C.The Link State id of the Inter-Area Prefix-LSA contains the prefix information.
• D.When the Intra-Area Prefix LSA has the Referenced Link State Type-2, the Referenced Link State id contains the interface id of the DR.

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What is the command to configure VRRP preemption delay?

• A.vrrp vrid 1 preempt-timer 20
• B.vrrp vrid 1 preempt-delay 20
• C.vrrp vrid 1 timer delay 20
• D.vrrp vrid 1 preempt-mode timer delay 20

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