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How to identify which protocol belongs to transport layer and which protocol belongs to network layer?

author
Asish Bhandari

How to identify which protocol belongs to transport layer and which protocol belongs to network layer

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author
Mr. Mohit Bhalla

To be precise , we cannot use any logic to identify a protocol by its name that it belong to which layer. For this we have to always remember it.

for eg ip belongs to layer 3 i.e network layer . 
but I want to clarify another thing here that even ip belongs to layer 3 but tcp that is a layer 4 protocol it also uses ip very frequently. 

so we have to understand that protocols actually doesn't belong to a certain layer instead it's there lookup which we generally misunderstood with there belonging. 

ip lookup is done at layer 3 where it checks the ip header's protocol field which reveals it  has received a tcp information or udp and accordingly tcp protocol's lookup is done at layer 4 . 

 

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