单项选择题
A. One network with 254 hosts.
B. 254 networks with 254 hosts per network.
C. 65,534 networks with 255 hosts per network.
D. 30 networks with 64 hosts per network.
E. 254 networks with 65,534 per network.
多项选择题 Which of the following IP hosts would be valid for PC users, assuming that a /27 network mask was used for all of the networks?（）
单项选择题 How would you express the binary number: 10101010 in its decimal and hexadecimal forms?（）
单项选择题 You have a network that supports VLSM and you need to reduce IP address waste in your point to point WAN links. Which of the masks below would you use?（）