A LAN is a group of computers and network communication devices inter connected with in a geographical limited area, such as a building or industry.
With the help of LAN file and computer equipment can be shared by these connected computers as well as E-mail is exchange LAN are categories by the following.
1. They transfer data at high speed.
2. They exit in a limited geographical area.
3. They are less expensive.
4. Useable by several 100 users at a time.