You are the Cisco Network Designer. Which is not major scaling， sizing， and performance consideration for an IPsec design？（）

多项选择题WhichthreeobjectiveswouldbemetbydesigningLayer3switchingintheCampusBackboneofamediumsizeinstallation？（）

A. scale to a large size
B. increase router peering
C. provide a flexible topology with no spanning tree loops
D. control broadcasts in the backbone

单项选择题TosecurelytransportEIGRPtraffic，anetworkadministratorwillbuildVPNsbetweensites.WhatisthebestmethodtoaccomplishthetransportofEIGRPtraffic？（）

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 ？（）

A. single layer of firewalling
B. multiple layers of firewalling
C. firewall connections in either an active or standby state
D. an architecture in which all traffic between firewalls goes through application-specific servers

单项选择题LafeyetteProductionsislookingforanewISPthathasimprovedavailability，load balancing，andcatastropheprotection.WhichtypeofISPconnectivitysolutionwouldbebest？（）

A. single run
B. multi-homed
C. stub domain EBGP
D. direct BGP peering

单项选择题YouaretheCiscoNetworkDesignerinCisco.com.WhichstatementiscorrectregardingNBARandNetFlow？（）

A. NBAR examines data in Layers 1 and 4.
B. NBAR examines data in Layers 3 and 4.
C. NetFlow examines data in Layers 3 and 4.
D. NBAR examines data in Layers 2 through 4.