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OSI and TCP/IP Layering Models. Presentation slides for the course CSE 323 – Computer Networks by Mohammad Mamun Elahi Assistant Professor Department of Computer Science and Engineering United International University [email protected] services. layer N layer N-1. layer N layer N-1.

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Osi and tcp ip layering models

OSI and TCP/IP Layering Models

Presentation slides for the course

CSE 323 – Computer Networks

by Mohammad Mamun Elahi

Assistant Professor

Department of Computer Science and Engineering

United International University

[email protected]


The osi reference model contd

services

layer N

layer N-1

layer N

layer N-1

PDUs (protocol data unit)

actual data flow on the lowest level

The OSI Reference Model (contd.)

In the late 1970s, to promote the compatibility of network

designs, the International Organization for Standardization

(ISO) proposed an architecture model called the open

systems interconnection references model (OSI model).

Layering Reference Models


The osi reference model contd1
The OSI Reference Model (contd.)

Layering Reference Models


The osi reference model contd2
The OSI Reference Model (contd.)

7

application

application

network services (email, file transfer)

6

presentation

formatting, encryption, and compression

5

session

setup and management of end-to-end conversation

transport

end-to-end delivery of messages

4

3

network

end-to-end transmission of packets

data link

transmission of packets on one given link

2

1

physical

transmission of bits

Layering Reference Models


The osi reference model contd3
The OSI Reference Model (contd.)

Encapsulation

data

H: header

T: trail

Each may be empty.

data

AH

7

application

application

data

AH

PH

6

presentation

data

AH

PH

5

session

SH

data

AH

TH

PH

transport

SH

4

data

AH

TH

PH

NH

3

network

SH

data

AH

DT

TH

PH

DH

NH

data link

SH

2

1

physical

bit streams

Layering Reference Models


The tcp ip reference model
The TCP/IP Reference Model

(Transmission Control Protocol/Internet Protocol)

The TCP/IP Reference Model

Layering Reference Models


The tcp ip reference model contd
The TCP/IP Reference Model (contd.)

Layering Reference Models


Application layer
Application Layer

Layering Reference Models


Transport layer

Process A

Process B

Transport Layer

  • Five basic services

    • Segmenting upper-layer application data

    • Establishing end-to-end operations

    • Sending segments from one end host to another end host

    • Ensuring data reliability

    • Providing flow control

Layering Reference Models


Internet layer
Internet Layer

  • The purpose of the Internet layer is to select the best path through the network for packets to travel.

  • IP performs the following operations:

    • Defines a packet and an addressing scheme

    • Transfers data between the Internet layer and network access layers

    • Routes packets to remote hosts

Layering Reference Models


Network access
Network Access

  • The network access layer is also called the host-to-network layer.

  • Concerned with all of the issues that an IP packet requires to actually make a physical link to the network media.

  • Network access layer functions include mapping IP addresses to physical hardware addresses and encapsulation of IP packets into frames.

Layering Reference Models


Comparison osi and tcp ip model
Comparison: OSI and TCP/IP Model

  • Similarities of the OSI and TCP/IP models:

    • Both have layers

    • Both have application layers, though they include different services

    • Both have comparable transport and network layers

    • Packet-switched, not circuit-switched, technology is assumed

    • Networking professionals need to know both models

  • Differences of the OSI and TCP/IP models:

    • TCP/IP combines the presentation and session layer into its application layer

    • TCP/IP combines the OSI data link and physical layers into 1 layer

    • TCP/IP appears simpler because it has fewer layers

    • TCP/IP transport layer using UDP does not always guarantee reliable delivery of packets as transport layer in the OSI model does

Layering Reference Models



Questions
Questions????

Layering Reference Models


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