單項(xiàng)選擇題

Which of the following protocols requests membership to a multicast group?（）

A.IGMP
B.SNMP
C.SMTP
D.ICMP

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單項(xiàng)選擇題

A small amount of spoofed packets are being sent across a network and a large amount of reply packets are being sent back to the network resource. Which of the following BEST describes this security threat?（）

A.Worm
B.Smurf
C.Logic Bomb
D.Man-in-the-middle

單項(xiàng)選擇題

Which of the following is a hybrid network topology used for fault tolerance, in which all computersMUST connect to each other?（）

A.Star
B.Ring
C.Bus
D.Mesh

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