In which state can BGP peers exchange Update messages？（）

单项选择题InPIM-SMoperations，thefirstrouterconnectedtothemulticastsourcesendstheRegistermessagetowhichdevice？（）

A.Multicast source
B.Multicast receiver
C.RP
D.RP mapping agent
E.Designated Router （DR）

单项选择题TypicalADSLbroadbandInternetaccessrequiresausernameandpasswordtobeenteredonend-userPCconnectedtotheADSLmodeminorderfortheendusertogainaccesstotheInternet.ifaCiscoADSLrouterisusedinsteadofanADSLmodem，whatfunctionalityisrequiredontheCiscoADSLroutersotheend-userconnectedtotheCiscoADSLroutercanaccesstheInternetwithoutenteringausernameandpassword？（）

A.PPPoA
B.Route Bridge Encapsulation（RBE）
C.PPPoE client
D.Integrated Routing and Bridging（IRB）
E.AAA

单项选择题WhatistheroleofForwardingEquivalenceClass（FEC）inMPLS？（）

A.FEC determines how IP packets are forwarded in MPLS LSP.
B.FEC determines how to establish an LSP path.
C.FEC determines how a group of IP packets are mapped to an LSP.
D.FEC determines how MPLS labels are stacked in LSP.
E.None of above.

单项选择题TheIPv6addressFE80：：656：78FF：FE9A：BCDEiswhattypeofaddress？（）

A.Site-local
B.Link-local
C.Multicast
D.None of the above

单项选择题Howmanytokenbucketsareneededtosupportamulti-actionspolicerthatmetersconforming，exceedingandviolatingtraffic？（）

A.1
B.2
C.3
D.4
E.5
F.6