ComputersNetworks

LANs are technologies of the present

At present, computer networks are very widespread . With their help, users can work with the same resources, programs, data, without departing from their own workplace.

What is LAN?

The most common type of networks is local computer networks.

LAN - a computer network that connects the local machines of users, located at some distance from each other. Although the range of such a network reaches several kilometers, it is usually used to connect computers at a short distance. As a rule, these are working machines of one enterprise or home personal computers.

LAN Configuration

By configuration, you can note local networks with and without server management (peer-to-peer).

Peer-to-peer local networks

In such networks, all computers are similar in technical characteristics. A peer-to-peer LAN is a local network in which each workstation can perform all the available functions of both the client and the server. For effective load sharing in such a LAN, the number of participating computers can not be more than 10. Otherwise, the performance of the entire network suffers.

Network with server management (multilevel)

In such LANs, one of the computers is characterized by better performance, memory capacity and other indicators. Such a PC is assigned by the server. Servers in a LAN are computers with high performance and a large amount of memory compared to the user's local machines. It provides the interaction of other computers on the network, stores public files and organizes access to them, transmits data to the client in the form of information for processing or the end result. LANs in which the server is used only for placing general data, are called networks with a dedicated file server. Along with such systems, there are LANs in which the server also processes information, and the client receives only the result. These are the so-called client-server systems.

LAN Topology

All the computers in the network on the physical level are interconnected. LAN topology is a way of connecting local machines. Now in local networks, such methods of connection as a bus, a star and a ring are used.

Bus topology

In the LAN, the installation of which is planned in accordance with this topology, the assembly uses a single cable, to which the local computers of users join. Thus, information from one machine passes through all the others. The workstation to which the data is addressed selects the necessary information from the general flow.

Advantages of LAN bus topology:

  • Failure in the operation of one of the local computers does not affect the operation of other machines and the network as a whole;
  • Relatively simple setup and design of LAN;
  • Relatively low cost of consumables (with a small radius of action, for example, within the same organization).

Disadvantages of topology:

  • Cable damage blocks the operation of the network as a whole;
  • Limited range and a small number of users;
  • Relatively small speed (depending on the number of computers on the network).

Topology "star"

A topology of this kind assumes interaction of local computers through network equipment (hub or hub), which provides parallel connection of working machines. Each station is connected to the central unit via a network card with a separate cable. As in the previous form of topology, outgoing data is available to all computers on the network and is accepted only by the user for whom they are intended.

Topology advantages:

  • Ease of organizing a new workplace;
  • high performance;
  • Quick troubleshooting or cable breakage;
  • The operation of the network is not affected by the failure of individual local machines.

Disadvantages of topology:

  • The failure of the central device terminates the operation of the entire network;
  • The number of users is limited by the number of ports of the central device;
  • Inefficiencies in cable consumption;
  • The cost of acquiring a hub (or other network equipment).

Topology "ring"

LAN, the installation of which is done according to the rules of this type of topology, consist of sequentially connected working machines forming a ring. Data in this case passes from one computer to another and stops at the one to which they are addressed.

Advantages of topology "ring":

  • There are no costs for network equipment (hub, router);
  • The ability to transfer information from multiple computers at the same time.

Disadvantages of topology:

  • The speed of the entire network depends on the speed of each computer;
  • When a cable breaks or a single computer fails, the entire network is disabled;
  • Complexity of configuration and configuration;
  • The organization of a new workplace temporarily paralyzes the work of the LAN.

The topology "ring" is practically not used in practice because of the general unreliability, but undergoes various modifications.

Currently, virtually no organization is not without a LAN. The network of topology "star" is more common because of their reliability and resistance to failures. LVS topology "ring", on the contrary, does not meet modern performance indicators and safety. However, LANs as a whole have firmly entered our life and contribute to the efficiency of any enterprise.

Similar articles

 

 

 

 

Trending Now

 

 

 

 

Newest

Copyright © 2018 en.birmiss.com. Theme powered by WordPress.