Broadcast
The Network Layer
Screening
Connectionless connection ie Computer A does not care if computer B receives the Packet of data or not, Computer A simply sends the packet to computer B.
Each packet carries the address of the intended recipient. Each computer has a unique address. It works rather like the postal system.
Photons
screening
Packet fragmentation attack
A patient information packet
The packet of electromagnetic radiation is the photon.
Any individual IP packet can be communicated electrically over cable, as optical signals over fiber, or wirelessly as radio signals.
six
Usually IP addressing is used.