Computer Networking flashcards

Data Communication

Data communicates from host-to-host

Computer Network

Internet is the “network of networks”

How do hosts communicate?

Hosts communicate using protocols
Protocols are the format, order of messages, actions taken,

Inter-networking principles

Minimalism, autonomy, best-effort service model, stateless routing, decentralized control

Characteristics of the Internet

• host-to-host communication

• packet switching

• best-effort service

• stateless routing

• autonomy

circuit switching

continuous connection

end-end resources are reserved

packet switching

simpler, great for bursty data → can support more users
only when you need it
on-demand resource allocation (resources are allocated only when necessary)
message → multiple packets (messages into smaller chunks → packets)
store and forward
can lead to packet queuing and loss

Best-effort service

In the event of packet queuing and loss
the best-effort service approach is to → Do NOTHING

Autonomy

each network has complete control over itself

network structure

network edge
- hosts: clients and servers
network core
- interconnected routers
- network of networks

Network core

mesh of interconnected routers
packet switching
- forward packets from one router to the next, across links on path from source to destination
- each packet transmitted at full link capacity

Internet Protocol Stack

application
transport
network
link
physical

Four sources of packet delay

transmission, propagation, nodal processing, queueing

Transmission delay