《计算机网络》第一次作业,第一次计算机网络随堂测试

第一次计算机网络随堂测试

计算机网络

一. 简写解释

ISP：互联网服务提供商

FDM：频分多路复用

HFC：混合光纤同轴电缆

RFC：Request For Comments(请求注解)

TDM：时分多路复用

ADSL：非对称数字用户线路

PDU：协议数据单元

NAP：network access point (网络接入点)

ISDN：Integrated Services Digital Network(综合业务数字网)

LAN：局域网

ps.In networking, PDU means "protocol data unit", and it is the generic

name of the "packets" of data used at different levels of the network.

Using the numbering of the OSI layers:

At layer 2, the PDUs are called "frame". Example: An Ethernet frame, a frame-relay frame.

At layer 3, the PDUs are called "packets". Example: An IP packet.

At layer 4, the PDUs are called "segments". Example: A TCP segment, a UDP segment.

二. 填空The Internet provides two types of services to its applications： ____ and _____.

面向连接服务 无连接服务

There are five layers in the Internet protocol stack: _____, ____, _____, ____ and ____ . 2-PDU is named as ____; 3-PDU is named as _____; 4-PDU is named as _____ ; 5-PDU is named as _____

应用层 传输层 网络层 链路层 物理层 frame packet segment message

The target of flow control is to prevent ____ overflow.

buffer

There are two basic switching method for networks, named, __ __ and packet-switching, respectively.

circuit switching

The physical media used in computer networks includes ______； _____；_____；

双绞线 同轴电缆 光纤

There are four delays in router:_____、_____、_____、_____;

排队时延 处理时延 传输时延 传播时延

三. 翻译

Protocol: 协议

intranets: 内联网

connection-oriented service: 面向连接服务

Connectionless service: 无连接服务

distributed application: 分布式应用

Flow control: 流量控制

congestion control: 拥塞控制

multiplexing: 多路复用

Circuit switching： 电路交换

packet switching： 分组交换

bandwidth: 带宽

Store-and-forward: 存储转发

statistical multiplexing: 统计多路复用

Virtual circuit network: 虚电路网络

comunication link: 通信链路

Protocol stack: 协议栈

service model: 服务模型