Question

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?
1. It can be used to prioritize packets
2. It can be used to reduce delay
3. It can be used to optimize throughput
4. It can be used to prevent packet looping

Answer 1

Correct Answer - Option 4 : It can be used to prevent packet looping

 The router is using the default route to transfer packets if the DIP of the packet does not match with any of the entries in its routing table. Default route leading to infinite looping sometimes, hence TTL (it restricts the life period of the packet) is used to avoid infinite looping.

Hence the correct answer is It can be used to prevent packet looping.