>Is a TCP packet (layer 4) encapsulated by a IP packet (layer 3) which is
>inside a Layer 2 frame?
Yes.
>If so, why the headers of a IP packet and TCP packet look so similar and
>redundant?
You'll learn more if I don't spoon-feed you an answer. Which headers
appear to you to be redundant? The IP version field, for example, is
only in IP.
Yes, I agree there are certain headers that might appear to be
redundant, but they are not. Perhaps it would be useful for many to
discuss these on the list.
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