Why every LAN may or may not be with WAN but every WAN will be with LAN ?
Our surrounding is full of various types of networks. We humans are strongly connected with it .Even our society is also a type of network which is called as social network. But here I want to explain a little bit about Computer networks. Here the name itself suggests that it is a network which connects computers. Note that here the word Computer does not mean only your PC but also it includes all the devices in the world.
Let me explain a little bit more about Computer network -
The computer network is a set of connected computers or devices. They can be connected through wired , wireless or in both modes. Each device connected in the network is known as “node”. These nodes can share the resources like Internet, Printer, FAX, file servers or any form of data with each other. For the wireless connection we use Ethernet Cable or Fiber Optic Cable and for Wireless connection we have to use Wireless Router.
So basically there are two most common types of computer networks i.e. LAN i.e. LOCAL AREA NETWORK and WAN i.e. WIDE AREA NETWORK. Lets get familiar with these two terms :
LOCAL AREA NETWORK :
Local Area Network is a group of computer and peripheral devices that are connected in a limited area such as school,organisation, laboratory, home, or office building. LAN i.e. Local Area Network , which is a widely useful network for sharing resources like files, printers, games,FAX and other applications. The simplest type of LAN network is to connect computers and a printer in someone’s home or offices. In simple way we can say that LAN will be used as one type of transmission medium.
WIDE AREA NETWORK :
This type of network is used across larger geographical area like country or continents. WAN network systems could be a connection of a LAN that connects with other local area networks using telephone lines and radio waves. It is mostly limited to an organization. Wide area networks are mostly established with high-end telecommunication circuits which is not so easy as LAN to establish.
A wide area network differs from a local area network because it is not restricted by geographic location. The best example of WAN is internet.
There are some basic differences between LAN and WAN :
LANWAN1. LAN is a computer network that covers a small geographic area, like a home, office,buildings.1. WAN is a computer network that covers a broad area like a country and continent.2. Setup cost is not high.2. Setup cost is high.3. LAN has a higher data transfer rate.3. WAN has a lower data transfer rate as compared to LAN.4. Ownership of LAN is private.4.WAN’s ownership can be private or public.5. The speed of LAN is high.5. The speed of WAN is slower than LAN.6.The propagation delay time is short in LAN.6. The propagation delay in WAN is long.7. Its design and maintenance is easy.7. Its design and maintenance is difficult.
Now as we are clear with the terms LAN and WAN lets move towards the main topic mentioned in the title i.e why every LAN is may or may not be with WAN but every WAN will be with LAN ?
lets take an example….
Suppose two friends Ramesh and Suresh . Both are Co-founders of an IT company called “R&S Tech” which provides software solutions to their customers. Initially this company have only one office where all the branches like Development section, Finance sections, Management section were in a single building. So that whenever data or resources needed, the data or resources are shared through LAN because LAN is faster than WAN and WAN was not necessarily needed to share data in a single building. Now Suresh decided to open a new company branch in another town . Now he has to setup all the sections of the company so he want to get all the data from headquarters of “R&S Tech” . But sharing of data through LAN is not possible because LAN has its own limitations. So he shared all the data through WAN or internet . that means here the data is taken from LAN of headquarters of “R&S Tech” and given to new company branch through WAN .
This example shows the relationship between LAN and WAN. Here when “R&S Tech” was a single office the data can be shared through LAN but it was not necessary to share data through WAN but when Suresh have to share the data from headquarters to company branch he needed WAN which taken data from LAN of headquarters . This example clearly shows that every LAN may or may not be with WAN but every WAN will be with LAN .
