1. A __________ signal is a sequence of voltage pulses that may be transmitted over a
wire medium.
a. analog
b. digital
c. optical
2. __________ data takes on discrete values such as integers or text
a. optical
b. analog
c. digital
3. In __________-shift keying, the two binary values are represented by two different
amplitudes of the carrier frequency. This technique is commonly used to transmit
digital data over optical fiber.
a. amplitude
b. frequency
c. phase
4. In __________-shift keying, the two binary values are represented by two different
frequencies near the carrier frequency.
a. amplitude
b. frequency
c. phase
5. In __________-shift keying, the phase of the carrier is shifted to encode data.
a. amplitude
b. frequency
c. phase
6. A __________ is a check bit that is appended to an array of binary digits to make the
sum of all the binary digits always odd or even.
a. FCS
b. Parity
c. CRC
7. In __________ transmission the time of the occurrence of each bit is related to a fixed
time frame.
a. synchronous
b. asynchronous
c. isosynchronous
8. The data along with preamble and postamble are referred to as a __________.
a. block
b. cell
c. frame
9. __________ is a function performed by a receiving entity to limit the amount or rate
of data sent by a transmitting entity.
a. error correction
b. flow control
c. error detection
10. In error __________, redundancy is introduced into the data stream so that the
occurrence of an error will be detected.
a. correction
b. management
c. detection
11. In __________ error correction, a station may send a series of frames sequentially
numbered up to some maximum value, after which the sequence numbers start over
again at 0 zero.
a. go back-N-ARQ
b. go back-N-Go
c. none of the above