单项选择题
A. The layer 3 protocol on which other protocols like TCP and UDP communicate.
B. Enables the IPSec protocol on internal workstations.
C. Packet-based detection and prevention of network attacks.
D. Single mode IP communication for a fiber line between remote sites.
单项选择题 Which of the following is a reason to block FTP at the corporate firewall?（）
单项选择题 An administrator receives a contract for a server install at a new building. Which of the followingshould be completed after installing the server?（）
单项选择题 An administrator is deploying three B/G wireless access points in a new office location. Which ofthe following channels eliminates interference?（）