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Powerpoint Templates

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Title: Powerpoint Templates


1
Lecture 04 Spring-2016
Data Communication
Muhammad Waseem Iqbal
Powerpoint Templates
2
Acknowledgments
  • These Lecture slides contain material from
  • Behrouz A. Forouzan, Data Communications and
    Networks, 4th Editionn
  • and
  • William Stallings, Data Computer Communication,
    8th edition

3
LAYERED TASKS
We use the concept of layers in our daily life.
As an example, let us consider two friends who
communicate through postal mail. The process of
sending a letter to a friend would be complex if
there were no services available from the post
office.
Topics discussed in this section
Sender, Receiver, and CarrierHierarchy
4
Figure Tasks involved in sending a letter
5
THE OSI MODEL
Established in 1947, the International Standards
Organization (ISO) is a multinational body
dedicated to worldwide agreement on international
standards. An ISO standard that covers all
aspects of network communications is the Open
Systems Interconnection (OSI) model. It was first
introduced in the late 1970s. ISO is the
organization.OSI is the model.
Topics discussed in this section
Layered ArchitecturePeer-to-Peer
Processes Encapsulation
6
Figure Seven layers of the OSI model
7
Figure The interaction between layers in the OSI
model
8
Figure An exchange using the OSI model
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