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GATE | GATE-CS-2006 | Question 5
  • Difficulty Level : Easy
  • Last Updated : 10 Mar, 2014

For which one of the following reasons does Internet Protocol (IP) use the timeto- live (TTL) field in the IP datagram header
(A) Ensure packets reach destination within that time
(B) Discard packets that reach later than that time
(C) Prevent packets from looping indefinitely
(D) Limit the time for which a packet gets queued in intermediate routers.


Answer: (C)

Explanation: following are lines from wikipedia

Time to live (TTL) or hop limit is a mechanism that limits the lifespan or lifetime of data in a computer or network. TTL may be implemented as a counter or timestamp attached to or embedded in the data. Once the prescribed event count or timespan has elapsed, data is discarded. In computer networking, TTL prevents a data packet from circulating indefinitely.

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