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Computer Networking : A Top-Down Approach

Computer Networking : A Top-down Approach

Authors:
James F. Kurose, Keith W. Ross
Exercise:
Review
Chapter:
Computer Networks And The Internet
Edition:
6
ISBN:
9780132856201
Question:
20

 

Question

Suppose end system A wants to send a large file to end system B. At a very high level, describe how end system A creates packets from the file. When one of these packets arrives to a packet switch, what information in the packet does the switch use to determine the link onto which the packet is forwarded? Why is packet switching in the Internet analogous to driving from one city to another and asking directions along the way?

Answer

Consider given data:

Suppose end system A wants to send a large file to end system B.

The following steps to end System A creates packets from the file at very high level:

  • Divide file into chunks.
  • Create a packet by attach header to chunk.
  • Each packet maintain an address of the destination.

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The following information in the packet does the switch use to determine the link onto which the packet is forwarded:

  • Switch uses the destination address.
  • It is easy to find which packet is forward to the header.

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The following the  packet switching in the Internet analogous to driving from one city to another and asking directions along the way:

  • Each packet maintain an address of the destination.
  • Reaching packet, packet display outgoing link which road to take to forwarded.

 

 

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