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
单项选择题 Which of the following technologies is used on the backbone of an ISDN?（）
单项选择题 Which of the following is true of an ACL when a packet matching an ACE is found?（）
单项选择题 Which of the following technologies allows an administrator to submit traffic to an IDS for review?（）
