One of the header fields in an IP datagram is the Time-to-Live (TTL) field. Which of the following statements best explains the need for this field?
Answer is (D). It can be used to prevent packet looping.
1. TTL decreases by one each time the packet is forwarded by a router.
2. If TTL reaches zero, the packet is discarded.
3. This eliminates packets trapped in routing loops.
ANS - D
TTL decreases by one as it passes to different router . If TTL is not there then packet will get into infinite loop .