Circuit－switching technology is used in Publish Switched Telephone Network(PSTN), Global S

A.话音交换技术

B.数据交换技术

C.集中交换技术

D.电路交换技术

is a channel' s capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.(68)is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69)．is the popular LAN develped under the direction of the IEEE 802.3.(70)is a device which enables digital microcomputers to communicate across analog telephone lines.

A．The volume

B．The bandwidth

C．The noise

D．The delay

In John Whitehead's opinion, which statement is true?

A．Face recognition technology may interfere with people's privacy.

B．Face recognition technology may enhance the country's constant surveillance.

C．Face recognition technology can be used in the same way wiretaps are used.

D．Face recognition technology can be used after its threat has been removed.

A. The summarized address for all internal subnetted addresses.

B. A private IP address assigned to a host on the inside network.

C. A registered address that represents an inside host to an outside network.

D. A unique IP address used on an internal network

E. Non of the above

whether to go with a shared or switched fast LAN technology once you start to max out your shared Ethernet of token-ring LAN is tough call. Users and analysts involved in(101)high-speed LANs have learned the benefits of each. However, there are trade-offs to each, and(102)which fast LAN technology to choose is critical for(103)network performance problems and(104)costly purchasing mistakes.

A．avoiding

B．clipping

C．choosing

D．deciding

E．dissolving

Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communication(72) as they become available, and then reassembling the packets(73) they arrive at their destination. Prior to the development of packet switching, early computer networks used leased, dedicated telephone circuits to(74) with terminals and other computers. In circuit-switched networks such as the telephone system, a complete point-to-point(75) is put together, and then communication can proceed.

A．binary

B．useful

C．digital

D．analog

The(66)is a channel's capacity which directly reflects the data transfer rate of the channel.

(67)functions in a NetWare network which is used to define addressing schemes.

The(68)is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.

(69)is the popular LAN developed under the direction of the IEEE802.3.

The(70 is a device which enables digital microcomputers to communicate across analog telephone lines.

A．volume

B．bandwidth

C．noise

D．delay

【An overall cellular network contains a number of different elements from the base transceiver station (BTS) itself with its antenna back through a base station controller (BSC), and a mobile switching centre (MSC) to the location registers (HLR and VLR) and the link to the public switched telephone network (PSTN). Of the units within the cellular network, the BTS provides the direct communication with the mobile phones. There may be a small number of base stations then linked to a base station controller. This unit acts as a small centre to route calls to the required base station, and it also makes some decisions about which of the base station is best suited to a particular call. The links between the BTS and the BSC may use either land lines of even microwave links. Often the BTS antenna towers also support a small microwave dish antenna used for the link to the BSC. The BSC is often co-located with a BTS. The BSC interfaces with the mobile switching centre. This makes more widespread choices about the routing of calls and interfaces to the land line based PSTN as well as the HLR and VLR.】 From the paragraph above, in a cellular network, the （98） can provide direct communication with a mobile phone, the （99） acts as a small centre to route calls to the required base station, and it also makes some decisions about which of the base station is best suited to a particular call.（100） can be used to link the BSC with related BTS。

A. BSC B. BTS C. MSC D. VLR A. BSC B. BTS C. MSC D. HLR A. Land lines B. Microwave links C. Microwave dish antenna D. Land lines or microwave links

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