1.circuit switching statically reserves the required bandwidth in advance whereas packet switching acquires & releases it as it is needed.

2.With circuit switching any unsed bandwidth on a allocated circuit is just waisted.with packet switching it may be utilised by other packets .

3.Circuit switching needs to set up an end to end path before any data can be sent.

4.When packet switching is used it is straight forward for router to provide speed and code conversion.

5.In packet switching packet may be delivered in the wrong order.

6Packet carriers usually base theier charge on both the no. of bytes(or packets carried and connect time.

7.with circuit switching, the charge is based on the distance and time only, not the traffic.