Project ForgeComputer Networks
OSI/TCP-IP Layers & Routing
GATE 2010
Medium
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?
- AIt can be used to prioritize packets.
- BIt can be used to reduce delays.
- CIt can be used to optimize throughput.
- It can be used to prevent packet looping.
Explanation
TTL is decremented at each router hop and the packet is dropped when it reaches zero — this bounds a packet's lifetime and prevents it from circulating forever in a routing loop.
Source: GATE CS 2010 (2010)
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