This document discusses computer networks and local area networks (LANs). It defines a network as consisting of two or more linked computers that share resources and exchange files. The computers can be connected by cables, phone lines, wireless technologies or other means. A LAN is described as a group of computers and devices connected by a common line or wireless link and sharing resources within a small physical area, ranging from a few users to thousands. Common network components, topologies, and standard network types are also outlined.

1. BY- ARYAN SAXENA
CLASS- 8 A

2.  A network consists of two or more computers
that are linked in order to share resources,
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
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3.  File sharing
 Resource sharing
 Communication and collaboration
 Remote access
 Data protection
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4.  Routers
 Gateways
 Repeaters
 Bridges
 Hub
 Modem
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5. Abbreviations Network
PAN Personal Area Network
LAN Local Area Network
CAN Campus Area Network
MAN Metropolitan Area Network
WAN Wide Area Network
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Topology Advantages Disadvantage S
BUS Takes less cable Break in the Bus,
network is down
Ring Easy to install Expensive parts
Star Easy to install; most
common; break in
workstation cable,
network still works
More expensive than Bus

7. Topologies Description
Linear Bus All nodes and peripheral devices are
attached to a common backbone cable.
Ring All nodes are connected in a circular
chain.
Star All nodes are connected to a central
hub.

9.  A local area network (LAN) is a group of
computers and associated devices that share a
common communications line or wireless link.
 Typically, connected devices share the
resources of a single processor or server within
a small geographic area .
 . A local area network may serve as few as two
or three users or as many as thousands of
users.
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