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Why we need IP and How URL Works

1. Why does the Internet need HTTP, TCP, IP and DNS? Why isn't the Internet Protocol (IP) enough to do the job? Please reply to these specific points of confusion.
2. Another thing that puzzles me is that sometimes when I type a uniform resource locator (URL), I was told that the host named in the URL does not exist. Yet often this is a host name I have been using successfully for months or even years. What is going on?

Thanks in advance for helping me answer these questions.

Solution Preview

These are interesting questions. I will try to answer them as follows.

A) According to the International Standards Organizations (ISO) Open Systems Interconnect (OSI) model [1], there are seven abstract layers for network communication. Internet Protocol occupies layer 3, the network layer which is responsible for providing the functional and procedural means of sending packets from a source to a destination via one or more networks ...

Solution Summary

Explains in detail the following points:
a) hy does the Internet need HTTP, TCP, IP and DNS? Why isn't the Internet Protocol (IP) enough to do the job? Please reply to these specific points of confusion.
b) Why does a URL does not work now, even though it was working some time ago.

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