Though defined in terms of seconds, a TTL value is implemented as a number of hops that a packet can travel before being discarded by a router.

Name: Though defined in terms of seconds, a TTL value is implemented as a number of hops that a packet can travel before being discarded by a router.
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The TTL (Time to Live) value is indeed defined in seconds, but it is implemented as a hop count, which decreases by one each time the packet passes through a router.

Though Defined in Terms of Seconds, a TTL Value Is