单项选择题
If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs?（）
A. 172.16.45.0 B. 172.16.45.4 C. 172.16.45.8 D. 172.16.45.12 E. 172.16.45.18
多项选择题 CDP is running between two TestKing devices. What information is supplied by CDP?（）
多项选择题 Which Layer 1 devices can be used to enlarge the area covered by a single LAN segment?（）
多项选择题 With regard to bridges and switches, which of the following statements are true?（）
