to this: x: What does "ping" mean?
-----------
There is an old fairy tale how to explain "on fingers" some terms
Ping in the same room with you sitting Vasya. You scream Vasya went to #@y in response to you sounds go yourself to #@y
Congratulations you just broke up.
TTL (time to live) life of the package
There is a mother and a hungry son. The son goes to his mother and asks her to feed him. Mom says she is busy and sends it to Dad. Dad is busy and sends to Mom. This is the time until the son dies and there is TTL.
There were other terms. I don’t remember...who knows write!