单项选择题

A user connecting a laptop to a wall jack is prompted for user credentials before being grantedaccess to the network. Which of the following is MOST likely implemented on the switch?（）

A. MAC filtering
B. PoE
C. IP filtering
D. 802.1X

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单项选择题

Which of the following technologies is used on the backbone of an ISDN?（）

A.VDSL
B.SDSL
C.OC3
D.ATM

单项选择题

Which of the following is true of an ACL when a packet matching an ACE is found?（）

A. The matching ACE is skipped to allow all other ACEs to be examined.
B. The matching ACE is processed and then the last ACE is examined.
C. The matching ACE is processed and then the next ACE is examined.
D. The matching ACE is processed and the next packet is examined

单项选择题

Which of the following technologies allows an administrator to submit traffic to an IDS for review?（）

A. Spanning tree
B. VLAN
C. PoE
D. Port mirroring