TTL
acronymnetworking
Stands for: Time To Live
A counter that limits how long data lives or how far a packet may travel before being discarded.
In DNS, TTL is how many seconds a record may be cached before it must be looked up again; in IP, it is the hop limit that stops a lost packet from circling forever. Same name, two jobs, both about bounding lifetime.
Also known as: ttl, time to live, hop limit