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LOCAL AREA NETWORK (LAN)

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on 26 November 2013

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Transcript of LOCAL AREA NETWORK (LAN)

NETWORK TOPOLOGY
1. Bus Structure
2. Ring Structure
3. Star Structure
The most common type of local area network is an Ethernet LAN.

The smallest home LAN can have exactly two computers; a large LAN can accommodate many thousands of computers. Many LANs are divided into logical groups called subnets.
LOCAL AREA NETWORK (LAN)
Local area network (LAN)
is a computer network hat interconnects computers in a limited area such as a home, school, computer laboratory, or office building using network media. The defining characteristics of LANs, in contrast to wide area networks (WANs), include their smaller geographic area, and non-inclusion of leased telecommunication lines.
DEFINITION
OTHERS DEFINITIONS
Wide-area networks (WANs)
: The computers are farther apart and are connected by telephone lines or radio waves.
Campus-area networks (CANs):
The computers are within a limited geographic area, such as a campus or military base.
Metropolitan-area networks (MANs):
A data network designed for a town or city.
Home-area networks (HANs)
: A network contained within a user's home that connects a person's digital devices.

In computer architecture, a bus is a communication system that transfers data between components inside a computer, or between computers. This expression covers all related hardware components (wire, optical fiber, etc.) and software, including communication protocol.
BUS STRUCTURE
ADVANTAGES
Easy to install
Simply expandable
Short cable lengths
DISADVANTAGES
Net expansion limits
By cable interrupt the net precipitates
Complicated access methods
A protection ring is one of two or more hierarchical levels or layers of privilege within the architecture of a computer system.
RING STRUCTURE
ADVANTAGES
Large net expansion
Performs better than a bus topology under heavy network load
Doesn't require a central node to manage the connectivity between the computers
DISADVANTAGES
Complex error tracing
High wiring expenditure
When disturbances net failure
The star topology uses a separate cable for each work station as shown in fig.The cable connects the work station to a central device typically a HUB
STAR STRUCTURE
ADVANTAGES
Simple cross- linking
Simple extension
High reliability
DISADVANTAGES
High wiring expenditure
Net failure in case of failure or overloading of the hubs

SIMPLE NETWORKS
A simple network consists of at least two computers, which are connected by a direct connection (crossover cable) or with a Hub or Switch .
A common connection point for
devices in a network. Hubs are
commonly used to connect segments
of a LAN. A hub contains multiple
ports. When a packet arrives at
one port, it is copied to the other
ports so that all segments of the
LAN can see all packets.
HUB
In networks, a device that filters and forwards packets between LAN segments.
SWITCH
CONCLUSION
THANK YOU FOR YOUR ATTENTION
Full transcript