User:Amy Suo Wu/Physical Media: Difference between revisions
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> As the engine in the car, but doesn't know how to steer. | > As the engine in the car, but doesn't know how to steer. | ||
> Responsible for routing and fragmentation | > Responsible for routing and fragmentation | ||
ROUTING | |||
> Flexible routing system called hopping, doesn't know final destination, but knows next nearest | > Flexible routing system called hopping, doesn't know final destination, but knows next nearest | ||
> Makes datagram containing "expiring date" | > Makes datagram containing "expiring date" | ||
FRAGMENTATION | |||
> Gets disintegrated into small packages (called datagrams) which can be send over the network. | > Gets disintegrated into small packages (called datagrams) which can be send over the network. | ||
> Packages are then reassembled to make a whole file again | > Packages are then reassembled to make a whole file again | ||
Revision as of 15:08, 27 October 2010
Physical Media
Properties and methods of protocols:
1. TCP (Transmission Control Protocol) > Transport layer (only responsible for making sure everything arrives; data travels to correct destination) > Uses the three way handshake > Creates an imaginary circuit between sender and receiver > Robust quality > Conservative and liberal. Accepts everything, but if it's corrupt will immediately delete.
+ Telephone call ("opening and closing sentences to establish conversation") + Offline meetings (would be nice if entire conversation would end with one miscommunication) + Make the circuit visible by throwing wool or rope of some sort.
2. IP (Internet Protocol)
> Partner of TCP (together they make a protocol suite)
> As the engine in the car, but doesn't know how to steer.
> Responsible for routing and fragmentation
ROUTING
> Flexible routing system called hopping, doesn't know final destination, but knows next nearest
> Makes datagram containing "expiring date"
FRAGMENTATION
> Gets disintegrated into small packages (called datagrams) which can be send over the network.
> Packages are then reassembled to make a whole file again
> Get's refragmentated to fit the network size (smaller "roads" will only allow smaller packages)
+ Chinese whisper (program a hub to change data slightly) + fragmentation reminds of of IKEA + Datagram looking where to go
3. TCP/IP > Fascilitates peer to peer communication > Distributed technology i.e. Rhizome model > Universal language > Robust flexible, strong > Open to broad variety of computers > Result of the action of autonomous agents
4. DNS (domain name system) > Translator from names to numeral (because computers read numbers more easily and humans read words better) > Predecessor was called hosts.txt, and was called namespace (centralized system) > DNS is decentralized database. > Inverted tree like structure (hieracy) > Decentralized because one layer can only talk to the next layer and not deeper layers.
+ current political system (politicians trying to communicate to lower levels) + institution + cross reference (for one document you need another document)
Question: where does DNS live?