答案：⑴~⑸ acadb
the simple network management protocol (snmp)is an _(1)_ protocol that facilitates the exchange of management information between _(1)_.it is part of the transmission control protocol/internet protocol(tcp/ip) protocol suite.snmp enables network _(1)_ tto manage network performance, find and sole network problems,and plan for _(1)_.
an snmp-managed network consists of three key components:managed devices , _(1)_,and network-management systems .
⑴a.physical layer b.link layer
c.network layer d.transport layer
⑵a.network stations b.network clients
c.network devices d.network servers
⑶a.servers b.administrators c.computers d.routers
⑷a.network growth b.network structure
c.network architecture d.network servers
⑸a.administrators b.agents c.managers d.servers
答案：⑴~⑸ dcbab
frame relay is simplified form of _(41)_ ,similar in principle to _(42)_, in which synchronous, frames of data are routed to different destinations depending on header information .
packets are routed throught one or more virtual circuits known as _(43)_. most virtual circuits are _(44)_,which means that the network provider sets up all dlci connections at subscription time . _(45)_are also part of the frame relay specification . they privide a link that only lasts only as long as the session .
（41）a. datagram switching b.datagram routing
c. packet switching d. packet routing
（42）a. x . 21 b. x . 25 c. x . 28 d. x . 29
（43）a. dlcis b.hdlcs c.sdlcs d.dls
（44） a. permanent circuits b. permanent virtual circuits
c. switched virtual circuits d. switching circuits
（45） a. permanent circuits b. permanent virtual circuits
c. switched virtual circuits d. switched circuits
答案：cbabc |
