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Lecture 2

CS100 Lecture Notes - Lecture 2: Digital Subscriber Line, Internet Message Access Protocol, Wi-Fi


Department
Computer Science
Course Code
CS100
Professor
Dave Tompkins
Lecture
2

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Module 2.1
Network Organization
Network: all the “components” that are connected together so that two computers can
communicate with each other
Synchronous:When both parties are communicating at the exactly the same time(Real time)
Asynchronous:When there is a time lag in the communication (Post Card)
Communication Layers(Different)
Highest(to out) to lowest(to in)
When you sent a message it goes from the highest to the lowest,
When you receive a message it goes from the lowest to the highest
High layer: context and meaning
Middle layers: interpretations as patterns and symbols
Lower layer: physical interactions and components
Protocols (Hand shakes)
Normal protocols(normal take)
Protocols for post card(postal code,specific address)
Every layer has a protocols
Module 2.2
Physical Layer (Lowest)
We are talking about physical Layer
4Different Physical Layers
Ethernet
Phone,ADSL and Cable Modems
Wifi
Cellular(3G/LTE)
Ethernet:
Connection Device requires unique identifier MAC(Media Access Control) address
Party (will talk at the same time)
Cable Grades&Speeds (one device that slower, it may slow done all the device)
Phone,ADSL and Cable Modems
Phone Modems (tones of the connection in old phone systems)
2-Device communication ( one modems to another)
ADSL(Asymmetric(Download is much faster, Upload are slower) Digital Subscriber Line)
Cable Modems(TV)
High Layer Protocols
Middle:TCP/IP
Low: Physical Layer
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find more resources at oneclass.com
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