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Suppose you are browsing the world wide web using a web browser and trying to access the web servers. What is the underlying protocol and port number that are being used?

  1. $\textsf{UDP, 80}$
  2. $\textsf{TCP, 80}$
  3. $\textsf{TCP, 25}$
  4. $\textsf{UDP, 25}$
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Best answer
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The underlying protocol for browsing web server is TCP

Why not UDP ? - The UDP is single request and single reply mechanism.

    For that reason UDP is used in

1. DNS Request

2.BOOTP/DHCP

3.Network Time Protocol and many more

But TCP is protocol at Transport Layer. Transport layer is responsible for end-to-end delivery. TCP is a Connection Oriented Protocol .

TCP is the underlying protocol of HTTP. HTTP is used to access the web server ,also the HTTP runs at 80. Its a well-known Port Number.

So the answer is B) TCP,80

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tcp and 80 option b is appropiate one
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