1. LOCAL AREA NETWORK (LAN) WIDE AREA NETWORK (WAN) A network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

2. Local Area Network A Local Area Network (LAN) is a network that is confined to a relatively small area. It is generally limited to a geographic area such as a writing lab, school, or building Wide Area Network Wide Area Networks (WANs) connect networks in larger geographic areas, Wide-Area Networks are commonly connected either through the Internet or special arrangements made with phone companies or other service providers.Internet

3. internet The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link billions of devices worldwide. It is a network that consists of millions of private, public, academic, business, and government networks linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and peer-to-peer networks for file sharingcomputer networksInternet protocol suitehypertextapplicationsWorld Wide Webelectronic mailtelephonypeer-to-peerfile sharing

4. intranet intranet is a private network.It may consist of many interlinked local area networks and also use leased lines in the wide area network.. The main purpose of an intranet is to share company information and computing resources among employees. An intranet can also be used to facilitate working in groups and for teleconferences.networkwide area network

5. Web Browsers Web Browsers are software installed on your PC. To access the Web, you need a web browser, such as Netscape Navigator, Microsoft Internet Explorer or Mozilla Firefox.

6. Wireless networks Wireless networks are computer networks that are not connected by cables of any kind. The use of a wireless network enables creativities to avoid the costly process of introducing cables into buildings or as a connection between different equipment locations. The basis of wireless systems are radio waves, an implementation that takes place at the physical level of network structure.

7. There are four main types of wireless networks: Wireless Local Area Network (LAN): Links two or more devices using a wireless distribution method, providing a connection through access points to the wider Internet. Wireless Metropolitan Area Networks (MAN): Connects several wireless LANs. Wireless Wide Area Network (WAN): Covers large areas such as neighboring towns and cities. Wireless Personal Area Network (PAN): Interconnects devices in a short span, generally within a person’s reach.

8. firewall A firewall is a network security system, either hardware- or software-based, that controls incoming and outgoing network traffic based on a set of rules.network