Switching & Topology are explain here.
Switching & Topology Whenever we have multiple devices we have problem of how to connect then to make communication possible. one solution is a point to point connection between each pair or devices. Switching & Topology are:-
example:- Mesh Topology, Star Topology
A better solution is switching techniques. A switch network consist of interlinked modes called switching.
1. Circuit Switching.
2. Packet Switching.
3. Message Switching.
1. Circuit Switching:- In this techniques first the complete physical connection between the two computer is established then data is transmitted from the source computer to the destination computer, just like the telephone connection system.
When two telephone subscribe one to communicate then first person dials the number then the system in between establish a complete physical connection between the telephone devices of the two person and then communication will start.
2.Packet Switching:-With message switching there is no limit on block size. In contrast packet switching places a type upper limit on block size.A fixed size of packet which can be transmitted across the network a specified.
Another difference is that message are stored in hard disk whereas as packed are stored in main memory. As a result packet switching have in the same techniques of store and forward is more efficient than the message switching.
3. Message Switching:- In this techniques the source computer sends data or messages to the switching of its first which stores the data in the buffer.
It then looks for three links to another switching of its and then sends the data to this office. It is also known as store and forward techniques. That is store first and then forward later.
Switching & Topology
Network Topology includes all the hardware that makeup the network. The basic type of network typologies are star topology, ring topology and bus topology.
Star Topology:- A star topology network has a host computer which is attached to local computers through multiple communication lines.The local computers are not linked directly to each other;they can communicate only via the host computer.
The routing function is performed by the host computer which centrally controls the communication between any two local computers. This is done by establishing a logical path between them.
Ring Topology:- A ring topology connects local computer processors together in a ring. Sometimes a ring network is also called a peer network.
The entire network remains operational even if one computer in the network fails.
The advantages of a mesh network is that it allows the users to create a star topology around any one computer in the ring.
Bus Topology:- In a bus topology, local processors share the same communication channel synchronous data transmission is used to transmit message along the channel in a bus topology.
A device address in each data frame of the transmitted message identifies the recipient of the message.
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