单项选择题
Lafeyette Productions is looking for a new ISP that has improved availability, load balancing, and catastrophe protection. Which type of ISP connectivity solution would be best?（）
A. single run
B. multi-homed
C. stub domain EBGP
D. direct BGP peering
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You are the Cisco Network Designer in Cisco.com. Which statement is correct regarding NBAR and NetFlow?（）
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. -
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Whichsite-to-siteVPNsolutionallowsCiscorouters，PIXFirewalls，andCiscohardwareclientstoactasremoteVPNclientsinordertoreceivepredefinedsecuritypoliciesandconfigurationparametersfromtheVPNheadendatthecentralsite？（）
A.Easy VPN
B.GRE tunneling
C.Virtual Tunnel Interfaces
D.Dynamic Multipoint VPN
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WhyisSTPrequiredwhenVLANsspanaccesslayerswitches？（）
A.to ensure a loop-free topology
B.to protect against user-side loops
C.in order to support business applications
D.because of the risk of lost connectivity without STP
E.for the most deterministic and highly available network topology
