單項選擇題

Which of the following features is essential in a firewall if it is to support RTP sessions?（）

A. Remote console
B. Statefulness
C. Address translation
D. Zones

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單項選擇題

A layer 3 switch can move packets between subnets based on which of the following criteria?（）

A. 802.1q tag
B. Port
C. Application
D. IP address

單項選擇題

Which of the following is an invalid IPv4 address?（）

A.225.0.0.1
B.254.254.0.0
C.256.0.0.4
D.224.2.1.4