Which of the following best describes the purpose of the TTL field in an IP packet?
To encrypt data payload in the packet for secure transmission
To authenticate the source of the packet
To limit the number of hops a packet can traverse before being discarded
To determine the priority of a packet in a congested network
The TTL field in an IP packet limits how many Layer-3 hops the packet can traverse. Each router decrements the TTL by one, and when the value reaches zero, the router discards the packet and typically sends an ICMP Time-Exceeded message. This mechanism prevents packets from looping indefinitely. The other options describe different network mechanisms and do not match the TTL function.
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