LAN Switching and Wireless

1. SONET system can use _________.

  1. STS multiplexers
  2. regenerators
  3. add/drop multiplexers
  4. all of the above

Correct answer: (D)
all of the above

2. _________ allow insertion and extraction of signals.

  1. regenerators
  2. ADMs
  3. STS multiplexer/demultiplexers
  4. none of the above

Correct answer: (B)
ADMs

3. _________ are special-interest groups that quickly test, evaluate, and standardize new technologies.

  1. Forums
  2. Regulatory agencies
  3. Standards organizations
  4. All of the above

Correct answer: (A)
Forums

4. _________ are used for cellular phone, satellite, and wireless LAN communications.

  1. Radio waves
  2. Microwaves
  3. Infrared waves
  4. none of the above

Correct answer: (B)
Microwaves

5. _________ augments the CSMA algorithm to detect collision.

  1. CSMA/CA
  2. CSMA/CD
  3. either (a) or (b)
  4. both (a) and (b)

Correct answer: (B)
CSMA/CD

6. _________ cable can carry signals of higher frequency ranges than _________ cable.

  1. Twisted-pair; fiber-optic
  2. Coaxial; fiber-optic
  3. Coaxial; twisted-pair
  4. none of the above

Correct answer: (C)
Coaxial; twisted-pair

7. _________ cable consists of an inner copper core and a second conducting outer sheath.

  1. Twisted-pair
  2. Coaxial
  3. Fiber-optic
  4. Shielded twisted-pair

Correct answer: (B)
Coaxial

8. _________ cable is used for voice and data communications.

  1. Coaxial
  2. Fiber-optic
  3. Twisted-pair
  4. none of the above

Correct answer: (C)
Twisted-pair

9. _________ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.

  1. Coaxial
  2. Fiber-optic
  3. Twisted-pair
  4. none of the above

Correct answer: (B)
Fiber-optic

10. _________ cables carry data signals in the form of light.

  1. Coaxial
  2. Fiber-optic
  3. Twisted-pair
  4. none of the above

Correct answer: (B)
Fiber-optic

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