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Chapter 1: Intro (Data Representation (Text, Numbers, Images, Audio,…
Chapter 1: Intro
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Data Flow
Simplex: 1 transmit, 1 receive
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Network Criteria
Reliability
Measure
- Frequency of failure
- Time for a link to recover from failure
- Network's robustness in a catastrophe
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Performance
Measure
- Transmit time
- Response Time
Depends
- Num of users
- Type of transmission medium
- Hardware
- Software
Categories of network
Local Area Network (LAN)
- in a single building or campus
Metropolitan Area Network (MAN)
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Physical Structures
Types of connection
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Multipoint (multidrop)
- Multipoint line more than 2 devices
Physical topology
Mesh
- n(n-1)/2
- has a dedicated point to point link
Advantage:
- each connection can carry its data load, eliminate traffic problems
- 1 link become unstable, not effect the entire system
Disadvantage:
- more cabling, num of I/O port required, hardware can be expensive
Star
- has a dedicated point to point link only to a central controller (hub)
Advantage:
- Less expensive, easy to install and configure
- 1 link fails, others not affected (robustness)
Disadvantage:
- Dependency, if hub down, whole system dead.
Bus
- Backbone link all devices (Multipoint connection)
- Drop lines: connection between device and main cable
- Taps: connector between drop line and main cable
Advantage:
- ease of installation, less cabling
Disadvantage:
- difficult to reconfigure and fault isolation
Ring
- dedicated point to point connection with only 2 devices on either side of it
- Repeater, regenerates the bits and passes them along
Advantage:
- easy to install and reconfigure and fault isolation simplified
Disadvantage:
- a break in the ring can disable the entire network
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