Circuit Switching, Packet Switching, Virtual Circuit Networks and Datagram Networks

This Slide includes the description about Circuit Switching, Packet Switching, Virtual Circuit Networks and Datagram Networks

1. 1.1 Computer Networks

2. Circuit Switching

3. Circuit Switching
Establishes a dedicated physical path between the sender
and receiver of the message before a message is
delivered
The entire message travels through the established path
from sender to the receiver
Received Message is Acknowledged by Receiver
Same as Telephone Communication

5. Pros of Circuit Switching
a)Dedicated path/circuit provides guaranteed
data delivery
b)is suitable for long continuous transmission.
c)Uses Connection Oriented Services

6. Cons of Circuit Switching
a) Waste of bandwidth if its Idle.
b) Require more bandwidth.
c) Time Required to establish a link is too long

7. Packet Switching

8. Packet Switching
doesn’t establish any physical connection before the
transmission starts
Message is divided into Packets and routed
Independently
Uses Connection Less Services

10. Pros of Packet Switching
a) High Data Transmission
b) No time Lost for Establishing Link
c) Faster
d) Independent Travel

11. Cons of Packet Switching
a) Packets May Lost their Routes
b) Wrong Order of Packets
c) Large Amount of Resources needed to handle Packets

12. Circuit Switching
vs
Packet Switching

13. Circuit Switching Packet Switching
Connection Oriented Connection Less
Entire Message Have to follow same
route during transmission
Entire Message can be divided and
routed Independently
Implemented at Physical Layer Implemented at Network Layer
Waste of bandwidth if Idle No Waste of bandwidth if Idle
Initially designed for Voice
Transmission
Initially designed for Data
Transmission

14. Virtual Circuits Networks

15. Virtual Circuit Networks
Is a packet switching methodology but establishes
Link before communication
Entire Message must have to follow same Link to
destination
is connection orientated
Virtual circuit is cleared after the data transfer is
completed

16. Pros of Virtual Circuits Networks
a) Uses Connection Oriented Services
b) Can use Diferent Physical Links each time

17. Cons of Virtual Circuits Networks
a) Link Setup Time
b) Resilience to the loss of a trunk i.e. no
dynamic switching in case of link failure

18. Datagram Networks

19. Datagram Networks
Is a packet switching methodology but no any
Dedicated Link
Message have to divided into Datagrams and
Each Packets are treated Independently
Connection Less

21. Pros of Datagram Networks
a) It is connectionless service
b) Every datagrams are treated Independently
c) Faster

22. Cons of Datagram Networks
a) Not Reliable
b)Packet May lost and no Service for
Retransmission
c) Need of High Resources

23. Possible Questions
a)Explain about Circuit Switching with Pros and Cons
b)Explain about Packet Switching with Pros and Cons
c)Explain about Virtual Circuit Networks with Pros and Cons
d)Explain about Datagram Networks with Pros and Cons
e)Compare Circuit Switching and Packet Switching
f)How Virtual Circuit Networks are difer from Circuit Switching
g)Compare Virtual Circuit Networks with Datagram Networks.

24. Next Lecture
Dial Up Modem
DSL
Hybrid Fiber Coaxial Cable
Wireless Networks

25. Thank You !!!!