This is the MCQs in Telephone and Cable Networks from book the Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in Electronics Systems and Technologies (Communications Engineering) this will definitely help you before taking the Board Exam.
In this particular topic you have learned how the two public networks, telephone and cable TV, can be used for data transfer. If you skip the summary visit Using Telephone and Cable Networks for Data Transmission.
Begin and Good luck!
Choose the letter of the best answer in each questions.
1. To use a cable network for data transmission, we need two key devices: a ______ and a _________
- A) CT; CMTS
- B) CM; CMTS
- C) CM; CMS
- D) none of the above
2. A local telephone network is an example of a _______ network.
- A) packet-switched
- B) message-switched
- C) circuit-switched
- D) none of the above
3. A traditional cable TV network transmits signals ______.
- A) downstream
- B) upstream
- C) upstream and downstream
- D) none of the above
4. The traditional cable TV system used ________cable end to end.
- A) twisted-pair
- B) fiber-optic
- C) coaxial
- D) none of the above
5. The telephone network is made of ______ major components.
- A) 4
- B) 3
- C) 2
- D) none of the above
6. Data from a computer are _______; the local loop handles _______ signals.
- A) analog; analog
- B) digital; digital
- C) digital; analog
- D) analog; digital
7. The original telephone network, which is referred to as the plain old telephone system (POTS), was an ________ system.
- A) analog
- B) digital
- C) digital as well as analog
- D) none of the above
8. The protocol that is used for signaling in the telephone network is called ______.
- A) SSS
- B) SS7
- C) POP
- D) none of the above
9. _______technology is a set of technologies developed by the telephone companies to provide high data rate transmission.
- A) LDS
- B) ASL
- C) DSL
- D) none of the above
10. The local loop has _______ cable that connects the subscriber telephone to the nearest end office.
- A) fiber-optic
- B) coaxial
- C) twisted-pair
- D) none of the above
11. The second generation of cable networks is called a(n) _________ network.
- A) HCF
- B) HFC
- C) CFH
- D) none of the above
12. The largest portion of the bandwidth for ADSL carries _______.
- A) upstream data
- B) downstream data
- C) control data
- D) voice communication
13. _______ is suitable for businesses that require comparable upstream and downstream data rates.
- A) SDSL
- B) ADSL
- C) VDSL
- D) (b) and (c)
14. The carrier that handles intra-LATA services is called a(n) _____ .
- A) IXC
- B) LEC
- C) POP
- D) none of the above
15. DMT is a modulation technique that combines elements of _______ and _______.
- A) FDM; QAM
- B) FDM; TDM
- C) PSK; FSK
- D) QDM; QAM
16. The carrier that handles inter-LATA services is called a(n) _______.
- A) IXC
- B) LEC
- C) POP
- D) none of the above
17. The modern telephone network is now ________.
- A) digital
- B) digital as well as analog
- C) analog
- D) none of the above
18. In an HFC network, the upstream data are modulated using the _______ modulation technique.
- A) ASK
- B) PCM
- C) QAM
- D) QPSK
19. _______ was designed as an alternative to the T-1 line.
- A) ADSL
- B) HDSL
- C) VDSL
- D) SDSL
20. HDSL encodes data using _______.
- A) 2B1Q
- B) 1B2Q
- C) 4B/5B
- D) 6B/8T
21. In an HFC network, the downstream data are modulated using the _______ modulation technique.
- A) PCM
- B) QAM
- C) PSK
- D) ASK
22. Another name for the cable TV office is the _______.
- A) head end
- B) combiner
- C) fiber node
- D) splitter
23. The term modem is a composite word that refers to the two functional entities that make up the device: a signal _______ and a signal _______.
- A) demodulator; modulator
- B) modulator; demodulator
- C) modern; demo
- D) none of the above
24. The two most common digital services are ________ service and ______.
- A) switched/56; DDS
- B) switched/56; switched/64
- C) DDS; switched 64
- D) leased; out-of-band
25. The United States is divided into many _______.
- A) IXCs
- B) LECs
- C) LATAs
- D) none of the above
26. The standard for data transmission over an HFC network is called _______.
- A) ADSL
- B) CMTS
- C) DOCSIS
- D) MCNS
27. In ________signaling, a portion of the bandwidth is used for signaling and another portion for data.
- A) mixed
- B) in-band
- C) out-of-band
- D) none of the above
28. Telephone companies provide two types of analog services: analog _______ services and analog _____services.
- A) leased; out-of-band
- B) out-of-band; in-band
- C) switched; in-band
- D) switched; leased
29. The HFC network uses _______ cable.
- A) coaxial
- B) twisted-pair
- C) fiber-optic
- D) a combination of (a) and (c)
30. In ______signaling, the same circuit is used for both signaling and data.
- A) mixed
- B) out-of-band
- C) in-band
- D) none of the above
31. Most popular modems available are based on the ________standards.
- A) X-series
- B) V-series
- C) VX-series
- D) none of the above
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