TTL = Time to live. It's a setting which prevents packets from living
eternally within the net. Each time a router forwards a packet it's supposed
to decriment the packet's ttl. Eventually when a the value drops to zero the
packet will be gone for good. The expectation is that the packet will get to
its destination before that period, but if it doesn't, the network isn't
bogged down with such things.
In a ping, the data flow speed is kinda listed with the time value measured
in miliseconds, though this isn't a truly accurate value since it's just
calculating how long it took for the ping to get to the remote computer +
the time it took for the response + the time it took for the remote computer
to get around to responding.
