单选题Two autonomous networks who wish to exchange routing data should use which of the following protocols?（）A OSPFB BGPC EIGRPD IS-IS

The author doesn't mention those participants ______ in the London International Financial Futures Exchange( LIFFE ).

A．who want to hedge against interest rate fluctuations

B．who wish to hedge against exchange rate fluctuations

C．who bet on which way interest rate will move

D．both A and B

When multiple routers are used in interconnected networks,the routers exchange information about（）using a dynamic routing protocol

A.destination addresses

B.IP addresses

C.work addresses

D.router addresses

A、A modem

B、A network card

C、A hub

D、A router(路由器)

A. It confines network instability to a single area of network.

B. It increases the routing overhead of the network

C. It supports VLSM

D. It routes between Autonomous Systems.

E. It allows extensive control of routing updates

In data communication, data link is those parts of two data terminal equipments that are controlled by a protocol along with the(71) data circuit, which together enable data(72). So-called protocol means, in short, a set of rules that determines the behavior. of functional units in achieving communication.Data circuit, however, consists of a pair of(73) transmission channels that provides a means of two-way data transmission. Between data switching exchanges, the data circuit may or may not include data circuit-terminating equipment (DCE), depending on the type of(74) used at the data switching exchange. Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment(75) to a DCE at the data switching exchange or dam concentrator location.

A．handshaking

B．interconnecting

C．linkage

D．joining

Intermediate system to intermediate system (IS - IS), is a protocol used by network devices (routers) to determine the best way to forward datagrams through a packet - switched network, a process called routing. Which three attributes are of the IS - IS routing protocol? （）

A. supports VLSM

B. link - state routing protocol

C. operati on is similar to BGP

D. supports two routing levels within an autonomous system

In most wide area networks, the communication subnet consists of two distinct components：transmission lines and

A．networts

B．switching elements

C．computers

D．data terminal equipment