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Layered Tasks-Basic Data Communication Systems-Lecture Slides, Slides of Digital Systems Design

Birla Institute of Technology and Science Digital Systems Design

This lecture is part of lecture series on Data Communication Systems. It was delivered by Prof. Prajin Ahuja at Birla Institute of Technology and Science. Its main points are: Layered, Tasks, Carrier, Internation, Standard, Organziation, Architecture, Encapsulation, Network, Physical

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2011/2012

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2.2

2-1 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.

Sender, Receiver, and Carrier

Hierarchy

Topics discussed in this section:

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2-1^ LAYERED TASKS We use the concept of layers in our daily life. As anexample, let us consider two friends who communicatethrough postal mail. The process of sending a letter to afriend^ would^ be^ complex 2.

if^ there^ were^ no^ services available from the post office.^ Topics discussed in this section:^ Sender, Receiver, and CarrierHierarchy

Figure 2.1 Tasks involved in sending a letter 2.
Note ISO is the organization.OSI is the model. 2.
Figure 2.2 Seven layers of the OSI model 2.
Figure 2.3 The interaction between layers in the OSI model 2.
Figure 2.4 An exchange using the OSI model 2.
2-3 LAYERS IN THE OSI MODEL In this section we briefly describe the functions of eachlayer in the OSI model. Topics discussed in this section: Physical LayerData Link LayerNetwork LayerTransport LayerSession LayerPresentation LayerApplication Layer2.
Figure 2.5 Physical layer 2.
Note The physical layer is responsible for movements ofindividual bits from one hop (node) to the next.2.
Figure 2.6 Data link layer 2.
Note The data link layer is responsible for movingframes from one hop (node) to the next.2.
Figure 2.7 Hop-to-hop delivery 2.
Figure 2.8 Network layer 2.
Note The network layer is responsible for thedelivery of individual packets fromthe source host to the destination host.2.
Figure 2.9 Source-to-destination delivery 2.
Figure 2.10 Transport layer 2.
Note The transport layer is responsible for the deliveryof a message from one process to another.2.
Figure 2.11 Reliable process-to-process delivery of a message 2.
Figure 2.12 Session layer 2.

Layered Tasks-Basic Data Communication Systems-Lecture Slides, Slides of Digital Systems Design

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Download Layered Tasks-Basic Data Communication Systems-Lecture Slides and more Slides Digital Systems Design in PDF only on Docsity!

2-1^ LAYERED TASKS We use the concept of layers in our daily life. As anexample, let us consider two friends who communicatethrough postal mail. The process of sending a letter to afriend^ would^ be^ complex 2.