networks

Complete

Concept

Internet

network of connected computing devices
network of networks, global ISPs connected via a few Internet exchange points

connecting all the regional ISPs directly results in a complete graph, connections

Authority

Network Information Centre(NIC) - administer IP address and Internet naming
Internet Society(ISOC) - Internet standards, education and policy
Internet Architecture Board(IAB) - issue and update technical standards on Internet protocols
Internet Engineering Task Force(IETF) - branch of IAB, develop and standadize protocols

Network edge

eg. end user, servers
access networks, allow users to access the Internet

Network core

eg. ISPs, routers
mesh of interconnected routers

Circuit switching

end-end resources reserved between source and destination
guaranteed connection, needs setup/teardown
resources cannot be shared

Packet switching

messaged broken into packets, routers provide best effort service
- store and forward: entire packet arrives at router before being forwarded
- routing: routing algorithm to determin path
- addressing: src and dest information to allow replying
no setup/teardown, packets might be dropped
resources are shared