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 It’saconfigurationthatexpertsarecallinga"firewallsandwich，"withthesecondfirewallprovidingasecondlevelofloadbalancingaftertrafficdown.Whatismeantbytheterm"firewallsandwich"？（）
单项选择题 LafeyetteProductionsislookingforanewISPthathasimprovedavailability，load balancing，andcatastropheprotection.WhichtypeofISPconnectivitysolutionwouldbebest？（）
单项选择题 YouaretheCiscoNetworkDesignerinCisco.com.WhichstatementiscorrectregardingNBARandNetFlow？（）