and easy:

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!
It is...
TCP and UDP

UDP is when you argue with a friend in communion, sit at different corners of the room and throw fireworks against each other. He threw - hit, threw the next - missed, threw the third. And then, on that side, there’s a cinderella – the server’s response.

TCP – You have two laptops and only one network cable. You get caught up in it from both ends and try to tear each other out of your hands. A rush there - a rush here, each accompanied by maths. The TCP-IP session is installed.