CDA FINAL EXAM
1. According to a famous communications theorem created by Nyquist,
the sampling rate using pulse code modulation must be at least three times
thehighest frequency of the original analog waveform.
Answer: FALSE
2. When a signal is amplified by an amplifier, the signal gains in .
Answer: DECI-BELS
3. Unfortunately, noise itself occurs as a(n) waveform, and
this makesit challenging, if not extremely difficult, to separate noise from
an analog waveform that represents data.
Answer: ANALOG
4. The digital encoding scheme is similar to the Manchester scheme in
that there is always a transition in the middle of the interval.
Answer: DIFFERENTIALMANCHESTER
5. The amplitude of a signal can be expressed as volts, , or
watts.
Answer: -AMPS
6. The NRZ-L encoding scheme is simple to generate and inexpensive
toimplement in hardware.
,Answer: TRUE
7. One encoding technique that converts analog data to a digital signal is
.
Answer: PULSE CODE MODULATION (PCM)
8. transmission requires the use of a very thin fiber-optic cable
and avery focused light source, such as a laser.
Answer: SINGLE-MODE
9. Fiber-optic cable cannot generate nor be disrupted by
electromagneticinterference.
Answer: TRUE
10. twisted pair wire is used in environments that have a
noticeableamount of electromagnetic interference.
Answer: SHEILDED
11. Wireless transmissions generally do not have to deal with right-of-
wayissues.
Answer: TRUE
12. cable is a thin glass cable, a little thicker than a human hair,
surround-ed by a plastic coating.
, Answer: FIBER-OPTIC
13. division multiplexing is a good technique for transmitting
multipleconcurrent signals over a fiber-optic line.
Answer: WAVELENGTH
14. The protocol is a high-speed protocol commonly found on
Applelaptops and incorporates two currently existing standards.
Answer: THUNDERBOLT
15. Because USB provides a digital interface, it is necessary to convert
thedigital signals of the microcomputer to analog signals for transfer
over a connection.
Answer: FALSE
16. The layer of the OSI model performs end-to-end connection
control.
Answer: TRANSPORT (LAYER 4)
17. The layer of the OSI model performs a series of
miscellaneous functions necessary for presenting the data package
properly to the senderor receiver.
Answer: PRESENTATION (LAYER 6)
18. The network layer of the OSI model is an end-to-end layer.
1. According to a famous communications theorem created by Nyquist,
the sampling rate using pulse code modulation must be at least three times
thehighest frequency of the original analog waveform.
Answer: FALSE
2. When a signal is amplified by an amplifier, the signal gains in .
Answer: DECI-BELS
3. Unfortunately, noise itself occurs as a(n) waveform, and
this makesit challenging, if not extremely difficult, to separate noise from
an analog waveform that represents data.
Answer: ANALOG
4. The digital encoding scheme is similar to the Manchester scheme in
that there is always a transition in the middle of the interval.
Answer: DIFFERENTIALMANCHESTER
5. The amplitude of a signal can be expressed as volts, , or
watts.
Answer: -AMPS
6. The NRZ-L encoding scheme is simple to generate and inexpensive
toimplement in hardware.
,Answer: TRUE
7. One encoding technique that converts analog data to a digital signal is
.
Answer: PULSE CODE MODULATION (PCM)
8. transmission requires the use of a very thin fiber-optic cable
and avery focused light source, such as a laser.
Answer: SINGLE-MODE
9. Fiber-optic cable cannot generate nor be disrupted by
electromagneticinterference.
Answer: TRUE
10. twisted pair wire is used in environments that have a
noticeableamount of electromagnetic interference.
Answer: SHEILDED
11. Wireless transmissions generally do not have to deal with right-of-
wayissues.
Answer: TRUE
12. cable is a thin glass cable, a little thicker than a human hair,
surround-ed by a plastic coating.
, Answer: FIBER-OPTIC
13. division multiplexing is a good technique for transmitting
multipleconcurrent signals over a fiber-optic line.
Answer: WAVELENGTH
14. The protocol is a high-speed protocol commonly found on
Applelaptops and incorporates two currently existing standards.
Answer: THUNDERBOLT
15. Because USB provides a digital interface, it is necessary to convert
thedigital signals of the microcomputer to analog signals for transfer
over a connection.
Answer: FALSE
16. The layer of the OSI model performs end-to-end connection
control.
Answer: TRANSPORT (LAYER 4)
17. The layer of the OSI model performs a series of
miscellaneous functions necessary for presenting the data package
properly to the senderor receiver.
Answer: PRESENTATION (LAYER 6)
18. The network layer of the OSI model is an end-to-end layer.
