单项选择题
A. to provide a mechanism to dynamically assign vlan membership to switch ports
B. to allow traffic to be carried from multiple vlans over a single link between switches
C. to allow native vlan information to be carried over a trunk link
D. to provide a mechanism to manually assign vlan membership to switch ports
E. to allow for managing the additions,deletions,and changes of vlans between switchs
单项选择题 Which cisco ios command can help to determine the timing of various debug events,relative to each other,when you are debugging a complicated router issue?（）
单项选择题 On which options are standard access list based?（）
单项选择题 A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote office is a non-cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?（）