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Lecture 2

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

Computer Science
Course Code
Dave Tompkins

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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
Phone,ADSL and Cable Modems
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
Low: Physical Layer
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