Download - Working of lan

1

Working of Local Area Network ( LAN )

2

• A Local Area Network (LAN) is best defined in terms of

the purpose it is meant to serve rather then in terms of

how its works

• LAN is a digital communication system capable of

interconnecting all the computers and terminals with in a

limited area such as an office building or factory or a

campus and share memory of the central computer

Local Area Network (LAN)

3Fig.1

4


Fig.2

5

• Computers in a LAN can communicate over twisted pairs

coaxial or fiber optic cables

• Twisted pairs provide the lowest rate of data transmission

but have the advantage that they are already installed in

may office buildings


6

Local Area Network (LAN) Cables & Connectors

Fig.3

7

The two main purposes of the LAN are

• To link the computers within an organization or campus

so that may share expensive peripheral devices, for

example high speed printers or magnetic disks holding

the data base

• To allow these computers to communicate with each

other


8

Local Area Network (LAN) in a Campus

Fig.4

9

A Local Area Network (LAN) connected by a HUB

Fig.5

10

A complex Local Area Network (LAN)

Fig.6

11

A minimum Configuration of Local Area Network (LAN)

Fig.7

12

LAN Network Interface Card (NIC) • A network card, network adapter, LAN Adapter or NIC

(network interface card) is a piece of computer hardware designed to allow computers to communicate over a computer network

• It is both an OSI layer1 (physical layer) and layer 2 (data link layer) device, as it provides physical access to a networking medium and provides a low-level addressing system through the use of Medium Access Control (MAC) addresses

• It allows users to connect to each other either by using cables or wirelessly

13

A Giga Bit Local Area Network (LAN) Card

Fig.8

14

A Local Area Network (LAN) with a Switch

Fig.9

9EC606A.34 15

Local Area Network (LAN) Cables

Fig.10

9EC606A.34 16

Local Area Network (LAN) Structural Cables

Fig.11

17

• LAN server has applications and data storage that are shared

in common by multiple computer users

• A local area network may serve as few as two or three users)

or as many as thousands of users

• Major local area network technologies are:

Ethernet, Token ring, FDDI (used to serve thousands of

users)


18

• Ethernet is by far the most commonly used LAN

technology

• A number of corporations use the Token Ring

technology

• FDDI (Fibre Distributed Data Interface is sometimes

used as a backbone LAN interconnecting Ethernet or

Token Ring LANs

• Another LAN technology, ARCNET, once the most

commonly installed LAN technology, is still used in the

industrial automation industry


19

• A group of application programs can be kept on the LAN

server

• Users who need an application frequently can download it

once and then run it from their local hard disk

• Users can order printing and other services as needed

through applications run on the LAN server

• A user can share files with others at the LAN server, read

and write access is maintained by a LAN administrator


20

• A LAN server may also be used as a Web server if

safeguards are taken to secure internal applications and

data from outside access

• In some situations, a wireless LAN may be preferable to a

wired LAN because it is cheaper to install and maintain


21

A wireless Local Area Network (LAN)

Fig.12

22

Summary

In this class, you have learnt about

• Local Area Network (LAN)

• Components of LAN

• Working of LAN

• LAN technologies

23

QUIZ

1. The most commonly used LAN technology to connect to thousands of users is

a) Token ring

b) Ethernet

c) FDDI

d) ARCNET

24

QUIZ

2. A LAN spans with in a geographical area of about

a) Within a room

b) Within a building

c) Within a campus of few Km

d) All the above

25

Frequently Asked Questions

1. Define Local Area Network (LAN)

2. Explain the working of LAN

3. List the features of LAN

Download - Working of lan

Top Related