BCA Semester 4: Computer Networks - Circuit Switching vs Data Gram vs Virtual Circuit

 Computer Networks
Circuit Switching vs Data Gram
vs Virtual Circuit

Q: What are the differences among Circuit Switching, Data Gram and Virtual Circuit?


Answer:

SNo.	Circuit Switching	Datagram	Virtual-Circuit
1.	Dedicated transmission path	No dedicated path	No dedicated path
2.	Continuous transmission of data	Transmission of packet	Transmission of packet
2.	Fast enough for interactive	Fast enough for interactive	Fast enough for interactive
4.	Messages are not stored	Packets may be stored until transmitted	Packets may be stored until delivered
5.	The path is established for entire conversation	Route established for each packet	Route established for entire conversation
6.	Call set-up delay, transmission delay	Packet transmission delay	Call setup delay, packet transmission delay
7.	Busy signal if called party busy	Sender may be notified if packet not delivered	Sender notified of connection denial
8.	Overload may block call setup; no delay for established calls	Overload increases packet delay	Overload may block call set-up; increases packet delay
9.	Usually no speed or code conversion	Speed and code conversion	Speed and code conversion
10.	Fixed Bandwidth	Dynamic use of bandwidth	Dynamic use of bandwidth
11.	No overhead bits after call setup	Overhead bits in each packet	Overhead bits in each packet