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Unit 1 Network Switching

The document compares circuit switching and packet switching networks, highlighting key differences such as the establishment of dedicated paths in circuit switching versus virtual circuits in packet switching. It outlines various parameters including bandwidth availability, call setup requirements, and reliability, emphasizing that circuit switching is more reliable but less efficient in bandwidth usage. Packet switching, on the other hand, allows for dynamic bandwidth usage and is more suitable for internet applications.

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49 views3 pages

Unit 1 Network Switching

The document compares circuit switching and packet switching networks, highlighting key differences such as the establishment of dedicated paths in circuit switching versus virtual circuits in packet switching. It outlines various parameters including bandwidth availability, call setup requirements, and reliability, emphasizing that circuit switching is more reliable but less efficient in bandwidth usage. Packet switching, on the other hand, allows for dynamic bandwidth usage and is more suitable for internet applications.

Uploaded by

rakshitsahni04
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Circuit Switching and Packet switching

Circuit switching Network:

A circuit-switched network is one of the simplest data communication methods in which a


dedicated path is established between the sending and receiving device. In this physical links
connect via a set of switches.

Following figure displays the working of circuit switched network.

In the above figure it shows a circuit switched network in which computer connect via 4 switches
with a point to point connections.

Packet switching Network:

In the Packet switching Network, the message is divide into packets. Each packet contains a
header which includes the source address, destination address, and control information.

Following are the differences between circuit switching and packet switching networks:
S.No Parameter Circuit switching Network Packet switching Network

1 Path In circuit switched network a In packet switched network no


dedicated path is created between dedicated path is created between
two points by setting the switches. two points. Only the virtual circuit
exists.

2 Store and In circuit switching there is no In virtual packet switched network,


forward concept of store and forward each node may store incoming
transmission transmission. packets and forward them after use.

3 Dedicated The links that make a path in In the virtual circuit network, links
circuit switched network are that make a route can be dedicated
dedicated and cannot be used for with other connections.
other connections.

4 Availability of In circuit switching, bandwidth is In the virtual circuit network,


Bandwidth fixed because it is reserved in require bandwidth is dynamic
advance. because it can be released as it is
needed.

5 The route The route followed by packets is The route followed by packets is
followed by always the same. may or may not be different.
packets

6 Call setup An in-circuit switching call setup In packet switching, call setup is
is required. not required.

7 Congestion In circuit switching, congestion In packet switching, congestion can


can occur at set up time. occur on every packet.

8 Wastage of In circuit switching, bandwidth is Other packets from an unrelated


Bandwidth fixed, unused bandwidth on an source may utilize unused
allocated circuit is wasted. bandwidth.

9 Charging In circuit switching, users are In packet switching, users are


charged based on time and the charged based on time and number
basis of distance. of bytes carried & not based on
distance.

10 Application Telephone network for Internet for datagram and reliable


bidirectional, real time transfer of stream service between computers.
voice signal.

11 Layers Circuit-switched network is A virtual circuit network is


implemented at the physical layer. implemented at the data link and a
network layer.

12 Reliability Circuit-switched is highly reliable. In packet switching, low reliability,


subject to congestion.

13 Overhead bits In Circuit-switched network, no In packet switching, Overhead bits


overhead bits after call setup. in each packet.

14 Technologies Circuit switching using two Packet Switching using two


or types technologies technologies
o Time Division Switching o Datagram circuit approach
In the above figure, it shows how a data gram approach is used to deliver four packets from
station A to station D.

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