5. protocol layering

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Have you ever thought that how the protocols that are required for the effective delivery of the messages from one place to anpther place take place in a real time internet..... This video explains about the concept called PROTOCOL LAYERING, where you can learn the way how the protocols are layered in such a way..

Simple examples are also used to make the concepts clean nd clear.

This video will help you to learn:

What is protocol layering in networks, OSI Model in Computer Networks, Layers of OSI Model, OSI Model, OSI Internet Module, OSI Layers and their Functions, Examples of OSI Models, 7 layers of OSI Models, Principles of Protocol Layering, Why layering the Protocols,


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1. Communication
Networks
-Protocol Layering

2. Introduction / Need for Protocol Layering
•Indatacommunicationandnetworking,a
protocoldefinestherulesthatboththe
senderandreceiverandallintermediate
devicesneedtofollowforeffective
communication.
•Whencommunicationissimple,wemay
needonlyonesimpleprotocol.
•whenthecommunicationiscomplex,we
mayneedtodividethetaskbetween
differentlayers.
•Inthiscaseweneedaprotocolateach
layer,orprotocollayering.
Scenario 1: Simple Communication
Scenario 2: Complex Communication

3. Does layering actually satisfies the needs?
LetsassumethatyouownashopwhereyousellJambreads,Fewpeoplegetssatisfied
withwhatyouserve.NowaFoodiewalksinandasksforcustomization.Canyoureally
satisfyhimwithwhatyouhave?

4. Principles of Protocol Layering
Thefirstprincipledictatesthatifwe
wantbidirectionalcommunication,we
needtomakeeachlayersothatitis
abletoperformtwooppositetasks,
oneineachdirection.
Thesecondprinciplethatweneedto
followinprotocollayeringisthatthe
twoobjectsundereachlayeratboth
sitesshouldbeidentical.

5. The Entire internet operates on a Globally
Accepted Standard / Model to communicate
effectively
•
•
•
•
Network Support
layers
✓Deals with physical aspects
of moving data from one
device to another device
User Support layers
✓Deals with the
interoperability among
unrelated software systems
Transport Layer
✓Ensures the reliable data
transmission
Physical Layer
Data Link Layer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer

6. OSI Model –Open System Interconnect
Alligator
Pet
Steve’s
Touch
Not
Do
Please

7. 1. Physical Layer
Transmission Rate
Bit
Synchronization
Physical Topology

8. 2.Data Link Layer
➢Framing
➢Physical Addressing
➢Flow Control
➢Error Control
➢Access Control

9. 3. Network Layer
Logical Addressing Routing

10. 4. Transport Layer
•Functions:
•Serviceportaddressing
•Segmentationandreassembly
•Connectioncontrol
•Connectionorientedservices
•Connectionlessservices
•Flowcontrolanderrorcontrol

11. Segmentation and reassembly

12. Service Port addressing

13. 5. Session layer
•Functions
•Dialogue control
•This function decides which application send / receive data and
connection type (Simplex or Duplex)
•Synchronization
•Maintains the same data rates at both sender and receiver nodes.

14. 6. Presentation layer
•Functions:
•Translation
•Encryption and decryption
•Compression

15. Presentation layer

16. 7. Application Layer
Email Services
Browsers
Online
Shopping
Services

17. References:
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• ―
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