What are three primary activities in the cycle of building an enterprise security strategy？（）

多项选择题Whichtwoofthesearerecommendedpracticeswithtrunks？（）

A. use ISL encapsulation
B. use 802.1q encapsulation
C. set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation
D. use VTP server mode to support dynamic propagation of VLAN information across the network 
E. set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.

单项选择题Whenisthesite-to-siteremoteaccessmodelappropriate？（）

A. for multiple ISDN connections
B. for modem concentrated dial-up connections
C. for a group of users in the same vicinity sharing a connection
D. for use by mobile users

单项选择题Whichroutingprotocolsupportsaflexibleareastructureusingroutinglevelsoneandtwo？（）

A. OSPF
B. EIGRP
C. IS-IS
D. BGP

单项选择题Whichsite-to-siteVPNsolutionallowsCiscorouters，PIXFirewalls，andCiscohardwareclientstoactasremoteVPNclientsinordertoreceivepredefinedsecuritypoliciesandconfiguration parametersfromtheVPNheadendatthecentralsite？（）

A. Easy VPN
B. GRE tunneling
C. Virtual Tunnel Interfaces
D. Dynamic Multipoint VPN
E. Group Encrypted Transport VPN

单项选择题WhendesigningtheWANmodulewithintheenterpriseedge，whichdocumentisusedtospecify theconnectivityandperformanceagreementswiththeserviceprovider？（）

A. RFP
B. RFC
C. SLC/SLA
D. SOW