Network Topology

Hello guys!

Today I would like share to you about what is network topology?

Network Topology is refers to the layout of the computer and devices in a communications network.

There are three types of network topology:

• Star Network
• Bus Network
• Ring Network

Here are the examples of network topology

Ring Topology

The network topologies has their own differences:

Network topology	Definition	Advantages	Disadvantages
Star topology	All the computers and other devices on the network connect to a central devices,thus forming a star.	·         If one devices fails,only that devices is affected. ·         Easy to troubleshoot and isolate problem.	·         If the hub or switch fails,the entire nework will be inoperabled. ·         More expensive because of the cost of hub/switch
Bus topology	A bus network consists of a single central cable(backbone),to which all computers and other devices connect.	·         Other devices can be attached or detached without disturbing the network. ·         Inexpensive and easy to install	·         There might be distruption when computer or other devices are added or removed. ·         Its difficult to identify the problem if the entire network shut down.
Ring topology	On a ring network,a cable forms a closed loop(ring) with all computers and devices arranged along the ring.	·         Cable fault are easily located,making troubleshooting easier. ·         All the devices in ring topology share the network resources fairly.	·         Data packets must pass through every computer,thus make it slower ·         More difficult to install than a bus network.

Then I have learnt about the classification of network.There are three types of network which are :

• LAN(LOCAL AREA NETWORK)
• MAN(METROPOLITAN AREA NETWORK)
• WAN(WIDE AREA NETWORK)

LAN

MAN

WAN

There are several comparison about these classification:

CRITERIA	LAN	MAN	WAN
AREA OF COVERAGE	Network cover limited geographical area such as closely positioned group of buildings network , network at home, network inside computer laboratory and network in office building  .	A high speed network that connects Local Area Networks in a Metropolitan Area such as a  cities or town.	Network cover large geographical  area  such a countries ,the  continents or the world
NETWORK SIZE	Small size ( in a building)	Larger size ( in a cities or campus)	Largest size (different states or countries)
SPEED	Fastest in data transferring and access time	Slower in data transferring and access time	Slowest  in data transferring and access time
EXAMPLES	-Network inside the computer lab                  - Network around school -Network inside your home	-Surveillance system -Traffic light monitoring system. - Cable Network TV	-Car Navigation System -Video conference -       Intelligent Transportation System ( ITS )
	LAN’s example can be an office whose different departments such as personnel, accounting etc are located in the same building and connected via bus topology using Ethernet cards.	Example of MAN is bank whose different branches in a city like Kuala Lumpur are connected using public telephone exchange and the system are connected with each other using LAN within each branch and different branches are connected using modem and bridges.	WAN’s example is the connection of various branches of American Insurance Group at different countries. These branches are linked using microwave satellite communication system or internet connection. Each branch has its own LAN circuit.
COMMUNICATION DEVICES	- Connected using modems, hubs, switch , router	- Connected using modems, hubs, switch , router	The  connection is made via  satellite communication link or via Internet
COST	Less costly setup and maintenance	More costly setup and maintenance	Costliest setup and maintenance
Network Ownership	Private – owned, controlled and manage by a single person or organization	Private - owned and operated by a single entity such as a government or large corporation	Not owned up any one organization but exist under collective or distributed ownership

Alright, thats all from me.Wait for the next week entry👯