IST 233 Study Guide

IST 233 Study Guide - IST 233: Chapter 1 Network a system...

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IST 233: Chapter 1 Network - a system that permits networked applications running on different hosts to  work together Networked Applications Applications that require a network to function 1970s E-mail, file downloading, and transfers 1990s The Wide Web, instant messaging This century Web 2.0 with user-developed content, e.g., Wikipedia, YouTube Social networking, e.g., Facebook Streaming media Traditional PC / Mainframe Application Terminal-to-Host (Timesharing) Client/Server app processing is split between client and server
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Peer-to-Peer (P2P) Computing Clients provide service to each other. Made possible by growing PC processing power. Hybrid Network Quality of Service Numerical service targets that must be met by networking staff Measurements of network performance Speed Availability Error rate… etc. Key Measures of Network Performance Speed How fast the network is Measured in bits per second (bps) Latency Delay of packets as they move through the network Measured in milliseconds (ms)
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Jitter Variation in latency due to success of packets Makes voice sound jittery Three dimensions of network speed Throughput: speed at application layer Latency: delay between first bit transmitted and received Jitter: variability of latency Shower Analogy High throughput: lots of water pressure Low latency: hot water comes on quickly Low Jitter: constant temperature Data Rate versus Throughput Throughput = Data rate - Overhead If you can’t think of an answer to a question about networks, try overhead! Is 10,000 kbps considered to be an accurate way of expressing the speed of a network?  Why or why not? No, measured in bits per second (bps) Circuit Switching vs. Packet Switching Circuit switching
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Predictable Guaranteed capacity Inefficient for many applications Message or Packet Switching Foundation of modern networking Breaks information into smaller messages Highly efficient and resilient Lacks predictability Why are the key benefits of this design for data transmissions? What are its major  weaknesses? How is packet switching similar to mailing a postcard through the US  Postal Service. Analog and Digital Communications Analog communications Human voice and music is analog when we produce and consume it Information is transmitted over a variable sign wave Broadcast radio and television Legacy land-line phone system
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Music: LP’s and cassette tapes Digital communications Analog content is converted to a digital representation of sign waves Usually some loss of “fidelity” Highly efficient, allows for perfect copies, easy networking Why is digital often faster than binary? Binary signaling transmits with two states 
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This note was uploaded on 02/07/2012 for the course IST 195 taught by Professor Staff during the Spring '08 term at Syracuse.

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IST 233 Study Guide - IST 233: Chapter 1 Network a system...

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