Comparision Of Various Switching Technniques:
| Circuit Switching | Packet Switching | Message Switching |
| Circuit switching as a dedicated path transmission. | Packet switching does not have any dedicated path transmission. | Similar to packet switching their no dedicated path transmission in message switching. |
| Their will be call setup delay. | It has message transmission delay. | It has packet transmission delay. |
| In Circuit switching messsage is not stored. | In packet switching message is stored. | In message switching message is stored for short time. |
| In this blocking may occur. | In this blocking may not occur. | In this blocking may not occur. |
| In this user is responsible for message-loss protection. | Network responsible for message-loss. | Network responsible for each packet but not for entire message. |
| Continous transmission of data. | Transmission of message. | Transmission of packets. |
| It operates in real-time. | It will not operates in real time. | It will operate nearly real-time. |
| It has fixed bandwidth. | It has dynamic bandwidth. | It has dynamic bandwidth. |
| It has busy signal. | Their no busy signal. | There is no busy signal. |
| There is no overhead bits after intial setup delay. | Overhead bits in each message. | Overhead bits in each packet. |
| In this path is established for entire message. | In this route is established for each message. | In this route established for each packet. |
| Speed is less. | Speed is more. | Speed is more. |
Comparison Of Various Topologies:
| Specifications | Bus | Star | Ring |
| Network robustness | Low | Moderate | Low |
| Installation cost | Low | Moderate | Low |
| Each node failures | Whole network will not get effected only failure node is disconnected. | Whole network will not get effected only failure node is disconnected. | Whole network is failure. |
| Fault detection | Difficult | Easy | Difficult |
| Device adding | Easy | Easy | Easy |
| Reconfiguration | Easy | Easy | Difficult |
| Connection media | Optical fibre or coaxial cable. | Twisted pair | Optical fibre or coaxial cable. |
Definition of Bandwidth and throughput:
Bandwidth:
When a channel can transmit a range of frequncies occupied by a signal is called bandwidth in herz. For example bandwidth of a telephone subscriber is 5 Khz. Or number of bits transmitted for second is called bits in seconds. Let’s consider a bandwidth of ethernet network is 100 mhz.
Throughput:
Throughput is defined as how fast useful information transmitted per unit time through the network. It is always less than channel bandwidth.