Design and Analysis of Local Area Networks 20

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Summary. Composition of the local area network.

LAN is a communication network, which is connected to data communication equipment, from a hardware point of view, a local area network, it is a collection of cables, network cards, workstation servers and other connected devices; From a software point of view, a LAN is a system that provides services such as files, print communications, and databases under the unified command of the operating system.

1.Web server (used to provide services to users, core).

2.Workstation (the front-end window of the network through which users typically access the network's shared resources).

3.Communication equipment (the material basis for data communication and information exchange of communication equipment).

4.Network software system (an indispensable part).

LAN Technology Overview I.

1.Concept of LAN (1) A LAN is a network that defines an area. (2) LAN has high data transmission efficiency.

3) The bit error rate is low (4) The line of the LAN is a dedicated chain 2The functions of the local area network (1) resource sharing, (2) data transmission and e-mail, (3) improve the reliability of the computer system, and (4) facilitate the distributed processing of the local area network.

The composition of the LAN LAN is a communication network, which is connected to data communication equipment, from the hardware point of view of a local area network, it is a collection of cables, network cards, workstation servers and other connected devices; From a software point of view, a LAN is a system that provides services such as files, print communications, and databases under the unified command of the operating system. 1.Web server (used to provide services to users, core) 2

Workstation (the front-end window of the network, through which users generally access the network's shared resources skinbook) 3Communication equipment (the material basis for data communication and information exchange of communication equipment) 4Network software system (an indispensable part of the macro).

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The geographical scope covered is small, and it is only connected within a relatively independent local area, such as a single or concentrated building complex.

2. Use a specially laid transmission medium for networking, and the data transmission rate is high (10MB S 10GB S).

3. The communication delay time is short and the reliability is high.

4. LAN can support a variety of transmission media.

There are many types of local area networks, which can be divided into wired networks and wireless networks if classified according to the transmission medium used by the network; If classified according to the network topology, it can be divided into bus type, star type, ring type, tree type, etc.; According to the access control method used by the transmission medium, it can be divided into Ethernet, token ring network, FDDI network and wireless local area network. Among them, Ethernet is the most widely used LAN technology.

In order to give a complete definition of a LAN, two approaches must be used: one is a functional definition and the other is a technical definition. The former defines a LAN as a group of desktop computers and other devices that are not far from each other in physical addresses and are interconnected in a way that allows users to communicate with each other and share computing resources such as printers and storage devices.

This definition applies to LANs used in office environments, factories, and research facilities.

In terms of the technical definition of a LAN, it is defined as a network system of computers interconnected by specific types of transmissions (such as cables, optical cables, and wireless**) and network adapters (also known as network cards) and monitored by a network operating system.

The distinction between functional and technical definitions is clear, with functional definitions emphasizing external behaviors and services; The technical definition emphasizes the material basis and method of composition required to form a LAN.

The name of the local area network (LAN) itself implies the locality of the geographic scope of the network. Due to the limitations of their smaller geographical range, LANs typically have much higher transmission rates than wide area networks (WANs). For example, the transmission rate of LAN is 10MBS, the transmission rate of FDDI is 100MBS, and the backbone rate of WAN is only 64Kbps in China, and the upper limit speed of the end-user is usually the cherry ridge rate.

The common topologies of LAN are bus type and circumference, which are determined by the limited geographical range, and these two structures are rarely used in WAN environments.

LAN also has a variety of features such as high reliability, easy scalability, easy management, and security.

The LAN is generally owned by a department or unit, which is easy to build, maintain, and expand, and the system is highly flexible. Its main characteristics are: the geographical scope covered is small, and it is only connected within a relatively independent local area, such as a single or concentrated building complex.

Use a specially laid transmission medium for networking, high data transmission rate (10MB s 10GB s) Short communication delay time, high reliability LAN can support a variety of transmission media There are many types of local area networks, if classified according to the transmission medium used by the network, it can be divided into wired network and wireless network; If classified according to the network topology, it can be divided into bus type, star type, ring type, tree type, hybrid type, etc.; According to the access control method used by the transmission medium, it can be divided into Ethernet, token ring network, FDDI network and wireless LAN. Among them, Ethernet is the most widely used LAN technology.