Change for a Quarter How many different ways can you make change for a quarter? (Differentarrangements of the same coins are not counted separately.)
1-28 Intro to Networks Network applications- applications that need more than 1 host to run Email, facebook, youtube IP Address- get through software/protocol Physical Address (MAC)- unique address on NIC Terminal Host- dumb terminal that cannot do any processing , only sends request to Host which does all processing and sends back to Terminal Client/Server- 30% processing run on client, most processing 70- 80% done on server Peer to Peer (P2P)- clients provide service to each other Skype Cloud Computing- resources are outsourced to a provider who is accessed via network Google docs Transmission Speed Measures in bits (bps) File size measured in bytes (Bps) Kilo 10^3 Mega 10^6 Giga 10^9 CIRCUIT SWITCHING Using only one wire Good for telephone lines but not data Because of long silencing o Request page and stay on it for a long time to read PACKET SWITCHING Packets- putting data in small blocks to transfer Multiple computers share same wire- Trunk line Lowers $$$ Packet switches do not know the entire path, just the next switch Deals with physical address (MAC) 1-28 Intro to Networks Internet Layer- deals with IP address which is requested from software (Router) ANALOG, BINARY, and DIGITAL TRANSMISSION Analog is continuous, Digital is not All information saved in your computer is Binary (Digital) Modems job -Transfer Analog to Digital through voltage Modulate- convert binary to voltage to send to network Demodulate- convert back to binary