Switching & Forwarding in Computer Networks by Md.Naseem Ashraf
A small presentation on the basics of Switching and Forwarding in Computer Networks.
Published on: Mar 3, 2016
Transcripts - Switching & Forwarding in Computer Networks by Md.Naseem Ashraf
Switching & Forwarding
By Md. Naseem Ashraf
A Presentation for Computer Networks
Birla Institute of Technology, Mesra, Extension Center - Patna
Where else have we seen this problem
before the advent of computer
• Limit on the Number of Hosts
• Limit on the size of Geographic Area a
What was the problem with Directly
Answer: Telephone Networks
Solution from the Telecommunication
• Use of a call exchange to switch your call
to the desired destination (Forwarding).
• Switches create an impression that
you’re connected to the receiver of the
• Set on another
• Is a Switch
• Set on
Switches in Computer Networks
• Computer Networks use Packet Switches.
• No direct connection is required between
• A Multi-input, multi-output device which
transfers packets from an input to outputs.
• They maybe servers, computers, satellites etc.
But, Still, What are Switches?
Summarizing Forwarding Features of
• Switches do have a fixed number of inputs &
outputs limiting the number of hosts. But,
why care? Just connect them, switches,
• They can span larger geographic area.
Key problems to look at when using
• They have Finite bandwidth of its outputs.
Arrival Rate of Packets > Delivery Rate of Packets
The use of storage buffers by switches to keep a certain
amount of input stored to balance contention.
The loss of data packets when the buffer limit is
exceeded and contention is not controlled; The incoming
packets are discarded too frequently.
That’s all for Today, Folks!!