单项选择题
A. 25 meters (82 feet) B. 100 meters (328 feet) C. 500 meters (1640 feet) D. 1000 meters (3280 feet)
Which of the following features is essential in a firew...
单项选择题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
A layer 3 switch can move packets between subnets based...
单项选择题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
Which of the following is an invalid IPv4 address?（）A.2...
单项选择题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
