Download Assignment on LAN, MAN and WAN

ASSIGNMENT
Assignment on LAN, MAN and W AN
Title: Assignment on LAN, MAN and WAN
Unit-1
1. What do you mean by communication model? Explain simple
communication model with suit block diagram.
Ans: Communication is the process of transmitting data and information from one
place to another. It is the activity of conveying information through the exchange of
thoughts, messages, or information, as by speech, visuals, signals, writing, or
behavior.
A communication model is the way (or model) in which data or information travels
from sender (source) to the receiver (destination). A basic communication model is
as given below:
TRANSMISSION
SOURCE
TRANSMITTER
RECEIVER
DESTINATION
SYSTEM
The components are as explained below:
Source: It is a device that generates data to be transmitted.
Transmitter: It is the device that converts data into transmittable signals.
Transmission system: It can be signal line or communication channel or medium that
carries data to be transmitted.
Receiver: The receiver receives the signal from transmission system and converts
received signals into data that can be handled by the destination device.
Destination: It is the device for which the data is intended to be transmitted.
2. Explain the features, advantages and disadvantages of LAN,
MAN and WAN with diagram.
Ans: The features, advantages and disadvantages of LAN, MAN and WAN are as
follows:
a) Local area network (LAN):
Local area network (LAN) is a network that connects computers and devices in a
limited geographical area such as home, school, computer laboratory, office
building, or closely positioned group of buildings.
It is the series of interconnected computers, printing devices, and other computer
equipment that share hardware and software resources
Features:
i)
Limited geographical area
ii)
Limited number of users
iii)
Reliability and stability
iv)
Flexibility
v)
Security and administration can be enhanced
Advantages:
i)
ii)
iii)
iv)
Inexpensive transmission media
Easy to implement
Easy to maintain
High data transmission rates
Disadvantages:
i)
ii)
iii)
Connects only limited amount of computers
Network is difficult to setup and needs to be maintained by skilled
technicians
Fixed to a small geographical area
b) Metropolitan area network(MAN):
A metropolitan area network (MAN) is a large computer network that usually
spans a city or a large campus. It typically connects a few LANs using high
speed backbone technologies. A MAN often provides efficient connections to a
WAN.
Features:
i)
The network size falls intermediate between LANs and WANs. A MAN
typically covers an area of between 5 and 50 km diameter.
ii)
A MAN (like a WAN) is not generally owned by a single organization.
iii)
A MAN often acts as a high speed network to allow sharing of regional
resources (similar to a large LAN).
iv)
It helps to connect several LANs
Advantages:
i)
ii)
iii)
iv)
Helps to connect computers in larger geographical area than that of LAN
Allows administration and control in large campuses
Allows centralized management of data
Allows sharing of regional resources
Disadvantages:
i)
ii)
iii)
Costly to implement
Difficult to setup and maintain
Network management is difficult
c) Wide area network(WAN):
Wide Area Network (WAN) Wide area network (WAN) is a computer network that
covers a large geographic area such as a city, country using a communications
channel that combines many types of media such as telephone lines, cables, and air
waves. A WAN often uses transmission facilities provided by common carriers, such
as telephone companies. Far-reaching system of networks that usually extends over
30 miles and often reaches across states and countries
Features:
i)
ii)
iii)
iv)
It covers large geographical area
It allows communication of computers located in a large geographical area
It is more complex than other networks
It connects several LANs, Mans and WANs
Advantages:
i)
ii)
iii)
iv)
Shares data and information over a large geographical area
Shares software and resources with connecting workstations
Covers a large geographical area so long distance businesses can connect on
the one network
Messages can be sent very quickly to anyone else on the network.
Disadvantages:
i)
ii)
iii)
iv)
Vulnerable to hackers or other outside threats
Expensive to setup
Generally slow
Information may not meet local needs or interests