单项选择题

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

A.Active
B.OpenSent
C.OpenConfirm
D.Established
E.Idle

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单项选择题

In PIM-SM operations， the first router connected to the multicast source sends the Register message towhich device？（）

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

单项选择题

Typical ADSL broadband Internet access requires a username and password to be entered on end-userPC connected to the ADSL modem in order for the end user to gain access to the Internet.if a Cisco ADSLrouter is used instead of an ADSL modem，what functionality is required on the Cisco ADSL router so theend-user connected to the Cisco ADSL router can access the Internet without entering a username andpassword？（）

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

单项选择题

What is the role of Forwarding Equivalence Class （FEC） in MPLS？（）

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.

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