6. The voltage difference between the tip and ring lines of the phone line when it is on-hook is:
a. 0V.
7. An integrated circuit that contains both encoding PCM circuitry and decoding PCM circuitry is known as:
a. a modem.
b. an analog to digital converter.
c. a codec.
d. a digital to analog converter.
Answer: c
8. The FM capture effect in cellular telephone systems is hindered from minimizing co-channel interface effects due to:
a. the use of frequency reuse.
b. the narrowband FM bandwidth that is used.
c. Rayleigh fading.
d. the cell splitting process.
Answer: c
9. Which is not a basic mode of switching digital data?
a. circuit switching b. network switching c. message switching d. packet switching
Answer: b
10. Which is not a popular topology for a local area network?
a. star
b. ring
c. bus
d. broadband
Answer: d
11. Which OSI level is associated with handling error recovery, flow control, and sequencing?
a. physical
b. data link
c. network
d. transport
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12. Which OSI level accepts outgoing messages and combines messages into packets, adding a header?
13. Which OSI level is concerned with message integrity between the source and destination?
a. data link
a. Public Branch Exchange b. Private Branch Exchange c. Private Bit Exchange d. Public Bit Exchange Answer: b
15. A circuit connecting one central office to another is a. line
b. link c. trunk d. interface Answer: c
16. A cable with added inductance every 6000, 4500 or 3000 feet is called a:
a. loaded cable b. “L” cable c. minus c cable d. balanced cable Answer: a
17. A situation in a telephone switching office when calls are unable to reach their destination is referred to as:
a. throughput problems b. lag
c. delay d. congestion Answer: d
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18. The process of changing channels for a new cell site is called a:
a. tradeoff b. handoff c. token passing d. frequency transfer Answer: b
19. The most common reason for sending a REL message is a. the destination receives a broadcast
b. the source receives a broadcast c. one party hangs up
d. the ringer voltage has not been set Answer: c
21. CSMA/CD stands for:
a. Carrier Sense Many Applications Common Data b. Carrier Sense Multiple Access with Collision Detection c. Carrier Sense Multiple Access with Common DATA d. None of the above
23. Setting the destination MAC address to all 1’s is called a:
a. broadcast address b. multiple delivery address c. common address
d. router address Answer: a
24. The 8-pin modular connector used to connectorize CAT5/5e/6 cable is:
a. RJ-11 b. RJ-48 c. RJ-45 d. RJ-40 Answer: c
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25. The term 100 baseT means:
a. 100 meters, baseband twisted pair b. 100 Mbps, baseband, twisted pair c. 100 meter, broadband, terminated d. none of the above
Answer: b
26. The CSMA/CA protocol avoids collisions by a. limiting transmission
b. using separate cables
c. waiting for acknowledgement that a packet has arrived d. none of the above
Answer: c
27. A wireless Ethernet standard is the:
a. IEEE 802.11b
29. The V.92/90 standard for high speed modems is a. combination of digital and analog
b. data rate to the service provider is typically at V.34 speeds c. data rate from the service provider is 56 kbps
d. all of the above Answer: d
30. A technique used by cable modems to determine the time it takes for data to travel to the cable head-end is called.
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32. A DSL service that provides 1.544 Mbps form the user to the service provider and up to 8 Mbps back to the user from the service provider is:
a. IDSL
c. Spectrum modulation d. Discrete multi-tone Answer: d
34. The protocol that has been developed to bridge the gap between mobile communications, the internet, and corporate intranets is the :
a. wireless application protocol b. wireless markup language c. wireless telephony applications d. wireless transmission protocol Answer: a
36. When making a total harmonic distortion measurement of a 1kHz sinewave, the fundamental frequency of the test instrument must be set to:
a. 1 kHz b. 3 kHz c. 500 kHz
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37. The 3G wireless system supports data rates up to a. 2 Mbps
a. is a 2G wireless development in the United States b. is a 2.5G wireless development in the United States c. is a 21G wireless development in the United States d. is a 3G wireless development in the United States Answer: d
39. A wireless Ethernet standard is the:
e. IEEE 802.11g f. IEEE 802.3g g. IEEE 802.5b h. IEEE 802.6b Answer: a
40. A wireless Ethernet standard is the:
a. IEEE 802.11b
41. A number that identifies the switch nearest to the caller is called which of the following.
a. Destination Point Code b. Circuit Identification Code c. Source Identification Code d. Origination Point Code
Answer: d
42. A number that identifies the switch nearest to the called party is called which of the following.
a. Destination Point Code b. Circuit Identification Code c. Source Identification Code d. Origination Point Code
Answer: a
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43. In CDMA, which Walsh code is the synchronizing signal.
a. 0
b. 16
c. 32
d. 5
Answer: c
44. In CDMA, the frequency reference is provided by?
a. GPS satellites
b. UPS clocking
c. UTC time code
d. SSBSC
Answer: a
45. How does WiMAX differ from WiFi? (select all that apply) a. WiMAX is a wired technology
b. Frequency assignments differ c. data rates differ
d. WiMax unit only has to compete once to gain entry into the network.
Answers: b,c,d
46. In what frequency band does Bluetooth operate?
a. the 5.2 GHz ISM band.
b. the 2.2 GHz ISM band.
c. the 2.4 GHz ISM band d. the 5.4 GHz ISM band.
Answer: c
47. This is used by Bluetooth to discover other Bluetooth devices or to allow itself to be discovered.
a. inquiry procedure b. paging procedure c. pinging procedure d. all of the above
Answer: a
48. What are the five aspects to consider when securing a communication link? (select all that apply)
a. authentication
b. confidentiality c. integrity
d. non-repudiation
e. availability of the network f. all of the above
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49. In a passive active
a. the bad guy is disrupting the communications link b. the bad guy is outside the system
c. the bad guy is inside the system d. the bad guy is just listening
Answer: d
50. This is a secret code that is used in the encryption algorithm to both create and decode the message a. pn code
b. cipher-key
c. pin key
d. CRC code
Answer: b