NETWORKS – DATA TRANSMISSION. Vocabulary Review Protocol Agreed set of rules Data packet Envelope of data sent across a network Contains Source address.

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NETWORKS – DATA TRANSMISSION. Vocabulary Review Protocol Agreed set of rules Data packet Envelope of data sent across a network Contains Source address.

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Presentation transcript:

NETWORKS – DATA TRANSMISSION

Vocabulary Review Protocol Agreed set of rules Data packet Envelope of data sent across a network Contains Source address Destination address Sequence # Timestamp Data itself And more!

Why does data transmission speed vary?

Transmission Media/Medium Metal conductors Ethernet cables Coaxial cables Phone lines Fiber optics Made from glass or plastic Example: FIOS Wireless (i.e. radio waves)

Transmission Media Characteristics Speed Reliability Cost Security Evaluate each of the transmission medias.

Transmission Media/Medium MediumSpeedReliabilityCostSecurity Metal Conductors Fiber Optics Wireless

What is data compression? Taking data and packaging it to a smaller size Examples of data compression: ZIP (archives multiple files and uses some compression) JPEG - images MP3 - audio H.264 – video (e.g. Blu-ray, YouTube)

Why is data compression used to transmit across a network?

Circuit-switched vs. Packet-switched Networks Circuit-switched Network Example: Phone Network ngNetworks.htm ngNetworks.htm t_a_Bell_System_Telephone_Switchboard_( ).jpg t_a_Bell_System_Telephone_Switchboard_( ).jpg What are the problems with circuit-switched networks? Packet-switched Network Example: The Internet

Packet Switching Break data up into packets & transmit Individual packets are not all necessarily transmitted through the same links Each packet travels over the best available link at the time Packets may arrive at destination out of order  must be re-ordered and reassembled