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发表于 2013-12-21 04:57:53 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
1 what is the computer network?
computer network refers to multiple computers in different geographical location has independent function and peripheral equipment, connected by communication lines, in the network operating system, the coordination and management of network management software and network communication protocol, to achieve resource sharing and information transmission computer system. Division of the network type
2. computer network?
according to the coverage and scale sac celine pas cher of network is divided into local area network, metropolitan area network, wide area network
according to the transmission medium is divided into cable, optical fiber network, wireless network
. According to the data коктейльное платье exchange mode division circuit switched network, packet switching network & network, packet switching; #8203;
according to the communication mode split broadcast transmission network, point-to-point transmission network & #8203;
services division according to the client, server, peer-to-peer network topology
3. network classification?
network topology is divided into general linear, star, ring
4.OSI reference model
physical layer: providing a physical connection to the data link layer using the transmission medium. The
data link layer: strengthen the bit transmission functions of the physical layer, provides the service for the network layer, to solve the communication problem between two adjacent nodes.
network layer: providing services for the transport layer, solve the interconnection of network.
transport layer: providing end-to-end reliable and transparent data transmission service
session layer protocol: management and coordination between different host a variety of process communication (conversation), which is responsible for the establishment, management and terminate the application session.
presentation layer: problem representation of data processing code through the node. The
application layer: providing network services for the users of the application. The
5.TCP/IP reference model of
application layer: providing various kinds of service, the need for the user for example: FTP, Telnet, DNS, SMTP,
transport layer communication сумки michael kors function: providing end-to-end application layer entities. (TCP or UDP)
Internet layer:
network interface layer:
6.OSI reference model and the TCP/IP угги купить reference models for the relationship between the physical layer sac louis vuitton homme of




of application layer data link layer, network layer transport layer of





transport layer session layer Internet layer
said what layer
network interface layer of
application layer

7. network interconnection equipment? In which a layer, can isolate collision and broadcast domains? The

device name
OSI layer name
collision domain
broadcast domain

> repeater
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