单项选择题
A. IPSec in tunnel mode
B. IPSec in transport mode
C. GRE with IPSec in transport mode
D. GRE with IPSec in tunnel mode
单项选择题 A network vulnerability scanner is part of which critical element of network and system security?（）
单项选择题 You are the Cisco Network Designer in Cisco.com. You are designing an e-Commerce module, which routing statement is correct?（）
单项选择题 With Call Manager v3.1, what is the maximum number of servers in a Cluster?（）