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Computer Networks and the Internet - Coggle Diagram
Computer Networks and the Internet
Protocol
A protocol defines the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.
The Network Edge
Physical Media
Terrestrial Rado Chanels
Coaxial Cable
Twisted-Pair Copper Wire
Fiber Optics
Satellite Radio Channels
Acces Networks
Access in the Enterprice (and the Home): Ethernet and Wifi
Home Access: DSL, Cable FTTH, and 5G Fixed Wireless
Wide-Area Wireless Access: 3G and LTE 4G and 5G
The Network Core
Packet Switching
Store-and-Forward Transmission
2L/R Delay for 1 packet over 2 links
(n+1)L/R for n packets over 2 links
d(end-to-end)=NL/R for N links of rate R
P packets sent of N links
Delay end-to-end = (N+P)L/R
Routers
Link-layer switches
Queuing Delays and Packet Loss
Output buffer/Output queue
Queuing delays
Packet loss
Forwarding Tables and Routing Protocols
Forwarding table
routing protocols
Use on demand
Circuit switching
end-to-end conneciton
Circuit
Silent periods
Pre-allocates use of transmission link regardless of demand
Multiplexing in Circuit-Switched Networks
Frequency-division multiplexing FDM
Bandwidth
Time-devision multiplexing
Time slots with all of the bandwidth