OSI Model

Which layer does ICMP and http work under OSI model ? Does ICMP work on networking while http work on application layer ?

If incoming and outgoing route to / from http application server is different, will it cause any problem ?

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Muhammad BurhanManager I.T.Commented:
Yes, ICMP is categorized as a layer 3 protocol in the OSI model and HTTP is from Application Layer.
incoming/outgoing, from/to traffic doesn't affect HTTP data. Because it is just executes algos or formats.
Just as a F.Y.I, different paths to/from hosts does not affect any IP traffic, this is called asymmetrical routing.   Traffic from host A to host B can take a totally different route/path than traffic from host B to host A.

In fact all packets in a data stream  from host A to host B do not even need to take the same path.

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