双代号网络图中，工作之间相互制约或相互依赖的关系，()在网络中均表现为工作之间的先后顺序。

A. AS - path

B. next - hop

C. MED

D. weight

E. local preference

F. origin

A. AS path

B. Split horizon

C. Poison reverse

D. Unicast RPF check

A．ARP

B．IGP

C．BGP

D．EGP

A. bgp confederation as

B. bgp confederation system

C. bgp confederation remote-as

D. bgp confederation identifier

iple autonomous () . BGP assumes that routing within an autonomous system is done by an intra-autonomous system routing protocol.BGP does not make any assumptions about intra-autonomous system （） protocols employed by the various autonomous systems. Specifically， BGP does not require all autonomous systems to run the same intra-autonomous system routing protocol. BGP is a real inter-autonomous system routing protocol. It imposes no constraints on the underlying Internet topology. The information exchanged via BGP is sufficient to construct a graph of autonomous systems connectivity from which routing loops may be pruned and some routing () decisions at the autonomous system level may be enforced. The key feature of the protocol is the notion of Path Attributes. This feature provides BGP with flexibility and expandability. Path （） are partitioned into well-known and optional. The provision for optional attributes allows experimentation that may involve a group of BGP （） without affecting the rest of the Internet. New optional attributes can be added to the protocol in much the same fashion as new options are added to the Telnet protocol， for instance.

A.routers B.systems C.computers D.sources A.routing B.switching C.transmitting D.receiving A.connection B.policy C.source D.consideration A.states B.searches C.attributes D.researches A.routers B.states C.meters D.costs

A. CIDR

B. Split horizon

C. Authentication

D. Classless masking

E. Hold-down timers

F. Multicast routing updates

G. Path Vectoring

A．autonomous-system 64555;confederation 1111 ;

B． autonomous-system 64555; confederation 1111 members [ 64555 64777 ];

C． confederation 64555; autonomous-system 1111 members [ 64555 64777 ];

D． sub-autonomous-system 64555; confederation 1111 members [ 64555 64777 ];

A. EBGP peers advertise MED and change Next Hop.

B. EBGP peers advertise Local Preference and do NOT change Next Hop.

C. Confederation BGP peers advertise MED and do NOT change Next Hop.

D. Confederation BGP peers advertise Local Preference and change Next Hop.

A. Information learned from one source is not distributed back to that source.

B. Routing updates from the poisoned source are ignored until a holddown timer expires.

C. Failed routes are advertised with infinite metrics.

D. New routing updates are ignored until the network has converged.

E. A route is marked as unavailable when its time-to-live is exceeded.

A．inet.0

B． inet.1

C． inet.2

D． inet.3