Answer:
LAN:- LAN is a logical explanation of how big a network can be called LOCAL.
If 2 or more computer or communicating devices which are located in a room or on a Floor or in a building or within a campus if connected are said to be connected on LAN.
MAN:-
If 2 or more computer or communicating devices or network which are geographically separated but located within the city, if connected are said to be connected on MAN.
WAN:-
If 2 or more computer or communicating devices or network which are geographically separated but located outside the city, if connected are said to be connected on WAN.
For Example:-
If your Head office is in Churchgate and branch office in mulund and if they are connected then they are connected on MAN.
Whereas
If your Head office is in Mulund and branch office in Thane and if they are connected, then, they are connected on WAN.
Because, it is just the Logical explanation.
Whatever we write on computer is in Alpha-numeric special character which is not understood by computer. Computer could only understand Voltage, current, signal. Its language is Binary. In binary there are only 2 character 1=5 Volt and 0= o Volts.
Whatever we write on computer that is converted to binary and is sent to the receiving end through lower layer and at the receiving end the reverse process is followed and the desired output is obtained.
The number of Bits transferred per second is called "Bandwidth".
LAN:-----------------------------------------------------------
Characteristic 1:-
Since LAN is a private N/W there is possibility than we would share our emotion on the N/w. Hence, there will be a sharing of huge file.
Hence, LAN should be capable of providing high capacity, high bandwidth and high speed.
Characteristic 2:-
The cost to deploy LAN should be cheap and should be very compact in size with high capacity.
Characteristic 3:-
The owner of premises is the owner of LAN. You should not lease the line from service provider to deploy LAN.
Characteristic 4:-
LAN should be capable of providing Voice, Video and data (Triple Play Service) on a single conversed infrastructure.
In today's world almost 80% of N/W is desperate.
Means,
There are three different set of infrastructure for voice, video and data separately.
Now, here the capex of the company is thrice as we have to lay three different set of infrastructure.
Also, Opex of company is thrice as there will be three different group to manage these services.
The solution to this problem is the Campus wide next generation Conversed architecture.
MAN and WAN:-----------------------------------------------------------
Characteristic 1:-
In Man and WAN we have to lease the link from the service provider. Now this links are very costly.
Hence, though MAN and WAN should be capable of providing high capacity, high bandwidth and high speed but since cost is the limiting factor the capacity may be from high to moderate.
Characteristic 2:-
The cost to deploy MAN and WAN will be high as we are suppose to lease the link from the service provider.
These links are very costly because
1) The service provider buys this link at a very high cost from the Govt.
2) We are getting signed Service Level Agreement (SLA), which guarantee us the N/W availability of 99.5% (say), Call drops not more than xyz quantity. And so on
Since the service provider has to maintain the network availability he must have a standby equipment or path so that traffic could flow and the customer enjoys the service without interruption.
Hence this links are Expensive.
Characteristic 3:-
This is very debatable Question, who is the owner of MAN or WAN.
The answer is here………….
The owner of premises is the owner of MAN and WAN and not the service provider as we just lease the link from the service provider and rest all the n/w element are your.