What happens to a packet's TTL as it traverses a router?

Study for the Internet Protocol Version 4 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Master the exam with confidence!

Multiple Choice

What happens to a packet's TTL as it traverses a router?

Explanation:
The TTL (time-to-live) acts as a hop limit to prevent packets from looping forever. Each router that forwards the packet subtracts one from the TTL. If the TTL reaches zero, the router drops the packet and may send back an ICMP Time Exceeded message to the sender. The TTL is set by the source when the packet is created and is not reset to a default value by routers, nor incremented or left unchanged as it travels. So, the TTL is decremented by 1 at each hop.

The TTL (time-to-live) acts as a hop limit to prevent packets from looping forever. Each router that forwards the packet subtracts one from the TTL. If the TTL reaches zero, the router drops the packet and may send back an ICMP Time Exceeded message to the sender. The TTL is set by the source when the packet is created and is not reset to a default value by routers, nor incremented or left unchanged as it travels. So, the TTL is decremented by 1 at each hop.

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