Computer Networks

A computer network can be as simple as two computers or the printer and computer being connected, or can be as complex as a million computers being connected.

Computer networks are classified into different types: Personal Area Network (PAN), Local Area Network (LAN), Campus Area Network (CAN), Metropolitan Area Network (MAN), Wide Area Network (WAN), and Wireless Local Area Network (WLAN).

• Personal Area Network (PAN)
  A PAN is perhaps the smallest type of network which only involves the connection between a computer and other external devices such as a printer, facsimile machine, and telephones at close range.
• Local Area Network (LAN)
  LAN covers a small area like an office, a home, or a building. It usually involves the connection of two or more computer systems in a small area. LAN can be in cables and hubs. It can also be wireless.
• Campus Area Network (CAN)
  In universities and campuses, the CAN is the ideal computer network. CAN is also found in buildings where computer connections are needed.
• Metropolitan Area Network (MAN)
  For cities and towns, MAN can be installed. A MAN is composed of several interconnected LANs and WANs, which don't extend beyond the city or town's boundaries.
• Wide Area Network (WAN)
  A WAN covers a wide area as a computer network. The Internet is the largest WAN. It uses routers and public communication lines to transfer data. Unlike Internet that is publicly accessed, many WANs are operated by private companies and are usually restricted.
• Wireless Local Area Network (WLAN)
  One of the fast emerging computer networks is the WLAN that uses Wireless Fidelity network technology. A WLAN-enabled device can connect to the Internet as long as it's within the range of a wireless network connected to the Internet.