User:Amy Suo Wu/Physical Media
< User:Amy Suo Wu
Revision as of 15:10, 27 October 2010 by Amy Suo Wu (talk | contribs)
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?