OSI Model

OSI Model

In the complete session of OSI model you would be able to give the ans of following Questions :;

• what is OSI model?
• what are the advantages and limitations of osi model
• how to remember all seven layers
• what are the functions of all layer
• which layer contain the physical address of device
• which layer is responsible for forwarding the packets

While studding for Networking it is very obvious to start with OSI Model, it is the basic building block for managing Network, You should be familiar with the OSI model because it is the most widely used method for understanding and talking about network communications. However, remember that It is only a theoretical model that defines standards for programmers and network administrators, not a model of actual physical layers.

OSI model & Its advantages:

• Divides networking tasks into logical layers for easier comprehension
• Provides a common language or reference point between network professionals
• Allows specialization of features at different levels
• Aids in troubleshooting
• Promotes standards between networks and devices
• Developers can change features without Changing the entire approach

Limitations of the OSI model.

• OSI layers are theoretical and do not actually perform real functions.
• Industry implementations rarely have a layer-to-layer correspondence with the OSI layers.
• Different protocols perform different functions that help send or receive the overall message.
• A particular protocol implementation may not represent every OSI layer (or may spread across multiple layers).

How to Learn all Seven layers of OSI model ?

Basically there is seven layers in OSI Model which could be tedious to remember, we could help you to remember the layers by adding mnemonics 

                         Layer Name ......Bottom to top ........Top to bottom)

• Layer 7 Application ................Away..................... All
• Layer 6 Presentation................Pizza ......................People
• Layer 5 Session...................... Sausage ..................Seem
• Layer 4 Transport....................Throw ....................To
• Layer 3 Network..................... Not..................... ...Need
• Layer 2 Data Link................... Do ..........................Data
• Layer 1 Physical......................Please......................Processing

Have some fun and come up with your own mnemonic for the OSI model, but stick to just one so

you don't get confused.