Amount of time transmitting data. Measured from when the first bit of data is pushed on the wire to the when last bit of data is pushed on the wire.

Time a single bit spends traversing the link. Measured as how long it takes to travel the distance of the wire at approximately the speed of light.

Time spent waiting in a buffer $/$ queue of a switch $/$ router.

Time difference between when the sender starts transmitting the packet, and the time when the receiver receives the complete packet

Total time for a packet to reach destination and a response to return to the sender

Amount of data sent $($or received$)$ per unit time. Measured in bits$/$time$.$