TCP does require some overhead. This overhead is used to fulfill several useful functions, such as ensuring that all data is sent, but the overhead has its "costs" with respect to efficiency. In cases where reliability is less important than speed, other alternatives (often based on UDP) are used.
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The port number lets IP know which service should be presented a data packet.
By the Port Number
The more data you have, the more accurate your information. If you have a large amount of evidence of one result, it makes it look correct.
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