Internetworks-Circuit switching network

• Provide a common method of routing information packets between the networks.

V.ParthipanAssistant Professor/CSE

Saveetha University

Switching can be divided into two broad categories.

Switching

Packet switching

Circuit switching

Datagram approach

Virtual circuit approach

Circuit switching

• Establish a dedicated communications channel.

Simple Switched Network

Circuit Switching

• Dedicated communication path between two stations

• Three phases– Establish– Transfer– Disconnect

Activity -1

POGIL – Students search and give the solution about switching techniques available for digital traffic.

Packet Switching Networks

• Datagram• Virtual circuit

Datagram Approach

• Each packet is treated independently of all other packets.

• Diagram shows how the datagram approach can be used to deliver four packets from station A to Station B.

Virtual Circuit • A preplanned route is

established before any packets are sent, then all packets follow the same route.

• A route between stations is set up prior to data transfer.

• All the data packets then follow the same route.

• But there is no dedicated resources reserved for the virtual circuit! Packets need to be stored-and-forwarded

Activity -3 Scale up –Students focus on searching the differences of packet switching networks and circuit switching networks.

IP addressing Methods

The IP address is a 32-bit address.

IP address classified in different class .• CLASS A • CLASS B • Class C• Class D• Class E

Activity -3

Scale-Up: 4 Groups of students, Each group discusses about the 4 different Classes(A,B,C & D) of IP address and list out the drawbacks of each and every IP address classes.