A.head-end routerB.branch-point routerC.midpoint router……

多项选择题WhichthreestatementsaboutBGPconfederationandroutereflectorsaretrue？（）

A.Clusters are used in confederation schemes to avoid loops.
B.BGP network can have a confederation within a route reflector area.
C.An internal BGP network cannot have a route reflector within a confederation.
D.An internal BGP network can have a route reflector within a confederation.
E.Clusters are used in route reflector schemes to avoid loops.
F.BGP network cannot have a confederation within a route reflector area.

多项选择题WhichtwostatementsaboutNTPversion4aretrue？（）

A.It supports fast synchronization at starting and before network failures
B.It supports automatic server discovery
C.It uses a fixed-point arithmetion
D.It supports the "nanokernel" kernel implementation
E.It does not support Public-Key Cryptography

多项选择题Process-levelredundancyisimplementedbyasystemmanagerprocessthatcreatesthestandbyprocess.Whattwofunctionsareprovidedbythesystem-levelprocesscalledQnetSymlinkManager（QSM）？（）

A.backing up the information for the broken connections
B.provides common information for connecting processes and services
C.detection of a failed connection
D.provides an abstract name for a process or service
E.distribution of symbolic link information

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

A.RP
B.multicast source
C.IGMP router
D.multicast receiver
E.PIM designated router

单项选择题WhatarethedefaultvaluesforGREtunnelkeeplivetimeandnumberofretries？（）

A.5 seconds and 3 retries
B.10 seconds and 5 retries
C.10 seconds and 3 retries
D.20 seconds and 5 retries
E.5 seconds and 5 retries