A gateway operates at the upper levels of the OSI model and translates information
between two completely different network architectures or data formats.
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Ques 17. What is attenuation?
The degeneration of a signal over distance on a network cable is called attenuation.
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Ques 18. What is MAC address?
The address for a device as it is identified at the Media Access Control (MAC) layer in
the network architecture. MAC address is usually stored in ROM on the network
adapter card and is unique.
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Ques 19. Difference between bit rate and baud rate.
Bit rate is the number of bits transmitted during one second whereas baud rate
refers to the number of signal units per second that are required to represent those
bits.
baud rate = bit rate / N where N is no-of-bits represented by each signal shift.
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Ques 20. What is Bandwidth?
Every line has an upper limit and a lower limit on the frequency of signals it can
carry. This limited range is called the bandwidth.