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GATE CSE 2015 Set 1 | Question: 22

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35 votes
35 votes

Which of the following fields of an IP header is NOT modified by a typical IP router?

  1. Check sum
  2. Source address
  3. Time to Live (TTL)
  4. Length
  • ๐Ÿšฉ Edit necessary | ๐Ÿ‘ฎ Arjun | ๐Ÿ’ฌ โ€œbetter answer neededโ€
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7 Answers

Best answer
42 votes
42 votes
Source Address.
• edited by
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Since it has been asked for IP Header so Source adress will not change but if it was about the frame than source address (i.e MAC Address) is changed.
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Ans B

Length and checksum can be modified when IP fragmentation happens. Time to live is reduced by every router on the route to destination.

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