The major criteria that a data communication network must meet are:
Performance
Consistency
Reliability
Recovery
Security
Performance is the defined as the rate of transference of error-free data. It is measured by the response time. Response time is the elapsed time between the end of an inquiry and the beginning of a response, e.g. requesting a file transfer and starting the file transfer. Factors that affect response time are:
Number of Users: The more users are on a network, the slower the network will run
Transmission Speed: The speed that the data will be transmitted at measured in bits per second (bps)
Media Type: The type of physical connection used to connect nodes together
Hardware Type: Slow computers such as XT, or fast ones such as Pentiums
Software Program: How well is the network operating system (NOS) written
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