GATE IT 2004 | Question: 86

Question

In the TCP/IP protocol suite, which one of the following is NOT part of the IP header?

• A. Fragment Offset
• B. Source IP address
• C. Destination IP address
• D. Destination port number

Answer 1

Answer is D: Destination Port number.

Why? Because the IP header has nothing to do with the port number.

Port numbers are used by the transport layer to ensure process to process delivery.

Comments

No. IP header do have destination Port with it.

http://en.wikipedia.org/wiki/Transmission_Control_Protocol

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I don't think we have a field for the port number in it. Do we?

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:P I was looking TCP header and not IP header. You are right :)

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@Arjun sir this proves even greats can made mistakes!

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I was thinking the same :-)

Answer 2

Option D::

Destination port number.

Actually source port number and destination port number is present in heder format of UDP as well TCP not in IP.

Answer 3

Ans: D

data link belongs to next hop address

n/w layer belongs to destination ip address where data packet actually going to transfer/send

transport layer belongs to destination port no (it define which service (in a destination system) belongs to arrived data packet)

Answer 4

Option D

Destination port number.

In TCP/IP protocol suite  destination port no is not a part of the IP header.