Update apcsp-internet-simulation.md
Update apcsp-internet-simulation.md

Addition
Standard: ACSN-1.C.3.
Add to section: What is packet transfer?
Packet transfer is a way of moving data through the Internet. It involves breaking up the data into smaller pieces, called packets, when sending it over a network. Packets may arrive at the destination in order, out of order, or not at all.
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