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