ADMS 2511 Chapter Notes - Chapter 4: Synchronous Optical Networking, Internet Protocol Suite, Hypertext Transfer Protocol

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Chapter 4: Networks
4.1 – What is a computer network?
- System that connect computer and other devices via communications media so that data
and info can be transmitted among them
Bandwidth: transmission capacity of a network (stated in bits per second)
Broadband: network transmission capacities ranging from 1 million bits per second – 175
megabits per second
Types of computer networks
Local Area Networks (LAN): connects two or more devices in a limited geographical
region usually within the same building, so that every device on the network can
communicate with each other.
- Every device has a network interface card (NIC) that is connected to the LAN’s
communication medium unshielded twisted – pair line (UTP)
Wide Area Network (WAN): networks covering large geographical area. WAN’s typically
connect multiple LAN’s
Enterprise Networks: Multiple WAN’s and LAN’s interconnected to form an enterprise
network
4.2 – Network fundamentals
Analogue and digital signals:
- Analogue signals are continuous waves that transmit info by altering characteristics of
the wave (2 parameters – amplitude and frequency)
- Digital signals are discrete pulses that are either on or off (series of 0’s and 1’s)
- Function of modems is to convert digital signals to analog signals (modulation) and vice
versa (demodulation)
- 3 types of modems: Dial up, Cable, DSL
Communications media and channels:
- Communicating data from one location to another requires some form of pathway or
medium – communication channels
Channel Advantages Disadvantages
Twisted – pair wire Inexpensive
Widely available
Easy to work with
Unobtrusive
Slow
Subject to interference
Low security
Coaxial cable Higher bandwidth
Less susceptible to
electromagnetic
interference
Relatively expensive
and inflexible
Hard to work with
Fiber - optic cable Very high bandwidth
Relatively inexpensive
Good security
Difficult to work with
Transmission technologies:
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