单项选择题
A. The command is accepted and the respective VLAN is added to vlan dat.
B. The command is rejected.
C. The command is accepted and you must configure the VLAN manually.
D. The port turns amber.
单项选择题 The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?（）
单项选择题 Which component of VPN technology ensures that data can be read only by its intended recipient?（）
单项选择题 An administrator attempts a traceroute but receives a "Destination Unreadable" message. Which protocol is responsible for that message?（）