local area networkAre distributed in different physical locations within several kilometerscomputerDevices are connected together inNetwork softwareWith the support ofresource sharingNetwork system.
The computers in the local area network can realize file managementApplication softwareSharePrinter Sharing、Working GroupInternalSchedule, e-mail and fax communication services.The LAN is a closed type, which can be controlled by two sets in the officeComputer composition, or thousands of computers in a company.
classification
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local area networkIt can be divided intoWired networkandwireless networkThe transmission medium of wired network mainly depends on copper cable or optical cable, which is restricted by wiring in some occasions: wiring and rerouting work is large;The line is easily damaged;Each node in the network cannot be moved, and the laying constructiondifficultyIt restricts users from networking.
WLAN is the solutionWired networkThe above problems occur.WLAN uses electromagnetic waves to send and receive data in the air withoutCableMedia.WLANData transmission rateIt has been able to reach 11Mbps, and the transmission distance can be as far as more than 20km.The wireless networking mode is a supplement and expansion to the wired networking mode, which enables the computer on the network to be mobile, and can quickly and conveniently solve the network connectivity problem that is not easy to realize by wired mode.
Main differences
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The local area network is in a certain area, and the wide area network needs to span a larger area. How to define this area?For example, a large company's head office is located inBeijingThe branches are all over the country. If the company connects all the branches together through the network, then a branch is a LAN, and the entire head office network is a WAN.
matters needing attention
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Connect according to rules
Each computer in the LAN is connected by twisted pair, and must be connected according to certain connection rules.
Strictly implement the grounding requirements.Because in the LAN, some weak signals are transmitted, if the operation is slightly improper or not in accordance withnetwork equipment If the specific operation requirements of are met, interference information may appear in the network, which can seriously lead to the whole network being blocked;In particular, some network switching devices have very strict requirements for grounding because they involve remote lines. Otherwise, the network devices will not reach the specified connection rate, resulting in various inexplicable failures in the process of networking.So in usenetwork equipment We must do it under the conditions specified by the equipment, otherwise it will cause great trouble to our work.
Use high-quality network card
In LAN, there are many reasons for the failure of communication between computers.If the network card is installed in the server, you must use a network card of good quality. Only a network card of good quality can "work" for a long time to reduce the failure rate. In addition, the capacity of the server and the network card must match each other, so as to achieve the "best use of everything".
Reasonably set equipment parameters
Set onnetwork equipment When setting parameters, you must refer to the network device parameters on the server or other workstations, so that each device can work together as far as possible.
