What is a LAN ?

Posted on October 9, 2009. Filed under: CCNA, ICND1 break down |

LAN stands for Local Area Network, it is a network of computers and other components located relatively close together in a limited area. A SOHO LAN might consist of two computers connected with a hub, while the LAN in a large corporate might include hundreds of computers located in many buildings.


It is interesting to notice that how similar the LAN and our public transportaion system are. As a car driver, our journey starts at the parking lot, we drive on the road, obey the traffic regulations and always watch for the traffic lights. Finally, our car is parked into a parking lot. The LAN works in the same way.

There are four common components for all the LANs:

  • Computers: Computers are the endpoints in the network, sending and receiving data. They are the parking lot in our metaphor.
  • Interconnections: Interconnections enable data to travel from one point to another in the network. There are two types of interconnections: Network Interface Cards (NICs) translate the data produced by the computer into a format that can be transmitted over the LAN. Network media, such as cables or wireless media, is the “roads”, that transmit signals from one device on the LAN to another.
  • Network deives: including hubs, ehternet switches and routers. They are the “traffic lights”, controling how data is transmitted in the network.
  • Protocols: Protocols is the “traffic regulations”, indicating the way the data is transmitted over a LAN and include Ehernet protocols, IP, ARP and RARP, and DHCP.

The LAN allows users to communicate and share resources such as printers, files, softwares locally. In case a resource is not available locally, the LAN can provide connectivity to remote resources via a gateway.

Ethernet is the most common LAN.

ICND1 and ICND2 break down


Make a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

4 Responses to “What is a LAN ?”

RSS Feed for IT Certifications Comments RSS Feed

This is very attention-grabbing, You’re an exceedingly competent blogger. We have joined up with ones give and check onward to while in the track down added of this superb article. In addition, I have provided your site around my myspace

[…] What is a LAN * Ethernet Types And Standards * The Need For And Operation of CSMA/CD * Ethernet Frame * Ethernet […]

[…] https://kl2217.wordpress.com/2009/10/09/what-is-a-lan/ xxxxx http//xyznetwork.blogspot.com/2009/10/what-is-lan_32.html […]

Where's The Comment Form?

Liked it here?
Why not try sites on the blogroll...

%d bloggers like this: