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computer Networking- CCNA part 5 of Segment 1 (Types of Network)

hello friends this is Vasu Birla ,, and today we will discuss about third method of classification of Networks .

3. Network Topologies  

 


What is Topology ?

Topology mean How devices connected to each other and how they transmit data in network .. ..

Ther are Two kind of ToPoloty .. 

i.  Physical Topology.   It means actual layout of the computer , cables and other devices ,,, simply how devices are looking physically,. that is Physical Toplology. ( Jo Actual dikh raha he human eyes se wo physical topology he).

Note:-  It does not sence how they look physical ,,but it matters that how they work logically ,, so  logical topology is important

 

ii.  Logical Topology.   It Means How devices data transfer the data in the network ,,or how they work ,, For example   Hub ,,   Hub is centralize device  ,,they are looking like a Star Topology (jab use apni aakho se dekhoge to star topology dikhegi) but when we understand the working of hub ,,we will get that  Logically that is Bus Topology. 

 Example of  Topologies :

..according to this method There are 6 Types of Network ..

  • Bus Topology 

  • Ring Topology

  • Star Topology

  • Tree Topology

  • Mesh Topology

  • Hybrid  Topology


Bus Topology :   It uses Trunk and Backbone to which all devices are connected in network ,,, (Ek backbone matlab long cable hoti he jisse sare devices connected rahte he)
each system use T-connecter for connection of this backbone or Cable. Earlier it is used with ThinNet and ThickNet  means 10Base2 and 10 Base 5 with coaxial cable  it was so popular topology.

Advantages of Bus Topology-  
 Cheap and Easy to installment. (Ye topology Sasti hoti thi aur network implement me bhi aasani hoti thi ) .
Require less cable (Ek hi cable ki jarurat hoti thi )  

 Disadvantages of Bus Topology-
Network Disturbance when new computer added and removed in Network . (Pura network kaam karna band ho jata he jab hume new computer jodna ya hatana ho network se )

 If cable would be fault whole network would be down  as well it is difficult to troubleshoot.
Bus Topology
Ring Topology :  Device are connected in the form or Circle , it means the first device in the circle is connected to the last device. FDDI, SONet and TOken ring technology are used to implement ring Technology.The Infrastructure or physical layout of the Ring Topology looks like a star topology but in working it is actually ring topology .  Ring topology works on the basis of TOken ring Technology  It is just a centralize device known as MSAU (Multi station access unit) similar to hub ,,, MSAU is the token ring technology  which is not popular today 
Advantages of Ring Topology-  
Easy to install this network and easy to troubleshoot .
Disadvantages of Ring Topology-
Network Disturbance when area of network expanded . 
If cable would be break and whole network would be down

Ring ToPo

How token ring works




Star Topology :  Today's Most popular Topology is the Star Topology.  It used a Centralize Device for connecting Systems and devices to each other ,,these centralize devices are Hub , Switches.

Each devices requires single cable for Point to Point  connection between Centralize device and it self.


Advantages of Star Topology-  
Easy Expansion without distribution  it is easy to add or remove systems .
if frailer caused from any place so only that system will not work  remaining network will work fine.
Disadvantages of Star Topology-
It requires more cables so it is costly.
If central connecting device (Hub or switch) will be failed so whole network will be shut down.
Difficult to implement and install this technology.

Star Topology


 Tree Topology :  It is a combination of Bus and Star Topologies  in Which bus topology is used for Back bone or a single cable through which all centralize devices are connected. We can expand networks in this.
Advantages of Tree Topology-  
Easy to identified faulty place so it is easy to troubleshoot. Disadvantages of Tree Topology- 
If Backbone will be failed so whole network will be shut down.

Tree Topology


Mesh Topology:  In this Topology  Each and every computer or device is connected to all rest of computers. It is mostly used in Wide area networks. It's wiring and cabling are very complicated.


Advantages of Mesh Topology-  
It provide Redundant paths for transferring data.Disadvantages of Mesh Topology- 
Very Costly 
Difficult to Implement (Very complicated wiring) 

Mesh Topology


Hybrid Topology :  Combination of all topologies , when two or more topologies together used that will be hybrid topology. 






we will discuss more things in the next part ,,, Hare krishna ,,,



#ccna #cisco  #Networking 
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