A Guide to Networking Essentials

Chapter 3  Questions


1. Of the following cabling elements, which does not commonly occur in coaxial cable?

a. wire braid
b. center conductor
c. outer sheath
d. optical fiber

2. If the center conductor and the wire braid make contact in a coaxial cable, the resulting condition is called a:

a. fault
b. open
c. short
d. dead circuit

3. What surrounds the center in a coaxial cable to separate it from the wire braid?

a. vacuum
b. conductive mesh
c. piezoelectric material
d. insulating layer

4. When a heavy-duty cable such as thickwire or fiber-optic is used to interconnect thinwire or TP segments, this cable is called a:

a. master network
b. bandwidth aggregator
c. backbone
d. inter-network link

5. The condition that requires cables not to exceed a recommended maximum length is called:

a. diminution
b. resistance
c. carrying capacity
d. attenuation

6. What component of a coaxial cable actually carries the data?

a. core
b. insulating layer
c. wire braid
d. sheathing or jacket

7. The space between a false ceiling and the true ceiling where heating and cooling air circulates is called:

a. duct-equivalent airspace
b. conduit
c. return air
d. plenum

8. Cable that is sheathed with this material should not be routed in ceiling or walls:

a. Teflon
b. Kevlar
c. foil
d. PVC (polyvinyl chloride)

9. The kind of fire-resistant cable specified by fire and building codes is rated how?

a. fire-resistant
b. fire-retardant
c. inflammable
d. plenum

10. To build the network in your New York City headquarters, you must run a cable down the elevator shaft from the customer service center in the second floor, all the way up to corporate offices on the 37th floor. The distance is 550 meters. What type of cable must you use?

a. unshielded twisted-pair (UTP)
b. thinwire coax (10Base2)
c. thickwire coax (10Base5)
d. fiber-optic cable

11. Which of the following cables is not suitable for network use of any kind?

a. Category 1
b. Category 2
c. Category 3
d. Category 4

12. Name the type of connector most commonly used with TP network wiring.

a. RJ-11
b. RJ-45
c. BNC
d. ST

13. Both thinwire and thickwire Ethernet use a form of BNC connector. True or False?

14. You’ve been hired to install a network at the Central Intelligence Agency (CIA). They want zero chance of electronic eavesdropping on their network. What kind of cable should you use?

a. UTP
b. STP
c. coaxial
d. fiber-optic

15. You’re preparing to install a conventional Ethernet network in your new office building, but your boss tells you to be ready to handle a switch-over to 100 Mbps Ethernet in 1999. What two types of cable could you install?

a. thinwire
b. thickwire
c. Category 4
d. Category 5
e. fiber-optics

16. When two cables are run side-by-side, the signals traveling down one wire may interfere with the signals traveling on the other wire. What is this phenomenon called?

a. RFI
b. attenuation
c. impedance
d. crosstalk

17. XYZ Corp. operates a thinnet network. When the network administrator goes to the supply room looking for some network cable, he finds a suitable length that ends in BNC connectors. It’s labeled RG-62. Will this cable work?

a. Yes, it’s exactly the right cable.
b. No, it won’t work at all.
c. Yes, it will work but not as well as RG-58.

18. Which of the following cabling elements does not occur in fiber-optic cable?

a. glass or plastic fiber core
b. glass or plastic cladding
c. wire braid
d. Kevlar sheathing
e. plastic or Teflon jacket

19. What benefits does shielding confer on shielded twisted-pair cable? (Choose all correct answers.)

a. improves flexibility
b. lowers susceptibility to interference
c. increased maximum segment length
d. decreases cost

20. If you have only two computers to connect to a network, which of the following cable types is the most appropriate?

a. STP
b. fiber-optics
c. thickwire
d. thinnet

21. The device that’s used to attached a computer to a thickwire cable is called a (n):

a. vampire tap
b. transceiver
c. AUI port
d. access point

22. Baseband transmission sends signals in which of the following forms:

a. analog
b. digital
c. spread-spectrum
d. frequency-hopping

23. Broadband transmission sends signals in which of the following forms:

a. analog
b. digital
c. spread-spectrum
d. frequency-hopping

24. The devices used to manage transmission and reception of data between a wired LAN and wireless components are called:

a. access points
b. gateways
c. wireless interfaces
d. antennae

25. The device that’s used to link buildings without cable is called a:

a. wireless hub
b. wireless router
c. wireless gateway
d. wireless bridge

26. Which of the following technologies might be used in a wireless LAN?

a. narrow-band radio
b. microwave transmission
c. infrared
d. laser

27. Spread-spectrum transmissions occur in which of the following forms?

a. channel-hopping
b. frequency-hopping
c. multiplexed sequencing
d. direct-sequence

28. Which of the following wireless technologies would not be appropriate to link two buildings together?

a. reflective infrared
b. point-to-point infrared
c. spread-spectrum radio
d. terrestrial microwave
e. low-power, single-frequency radio

29. The phenomenon that causes satellite microwave signals as long as 5 seconds to travel from sender to receiver is called:

a. circuit setup time
b. microwave latency
c. propagation delay
d. orbital mechanics

30. To support a population of mobile computing users, which wireless technology is most appropriate?

a. point-to-point infrared
b. satellite microwave
c. terrestrial microwave
d. spread-spectrum radio