Transcript What is a network Local Area Network

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.
LOCAL AREA NETWORK (LAN)
WIDE AREA NETWORK (WAN)
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
 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 sharing
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.
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.
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.
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.
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.