多项选择题
A.Filter Smurf ICMP packets.
B.Filter as close to the core as possible
C.Filter as close to the edge as possible
D.Filter as precisely as possible
E.Filter both source and destination where possible
单项选择题 Iftworouters，bothreachablefromoneanother，originatefunctionallyequivalenttype2external-LSAs（i.e，samedestination，costandnon-zeroforwardingaddress），Whichofthefollowingstatementswouldapply？（）
多项选择题 Assumetworoutersonthesamesubnet，R1andR2，bothconfiguredforHSRP.R1hasapriorityof120.WhichofthefollowingHSRPinterfaceconfigurationswillalwaysresultintheR2becomingtheprimary？（）
多项选择题 IftheOSPFprotocolisusedtoconnectcustomeredge（CE）routerstoserviceprovideredge（PE）routersintheVPNbackbone，whichtwooptionsbestdescribetheuseofSHAMlinks？（）