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Ch 3

1. What is different about the method used to boost a digital signal's strength, compared with the method of boosting an analog signal's strength?

d. A digital signal requires a repeater, which retransmits the signal in its original form, and an analog signal requires an amplifier, which increases the strength of both the signal and the noise it has accumulated.

2. Which of the following decimal numbers corresponds to the binary number 00000111?

c. 7

3. A wave with which of the following frequencies would have the shortest wavelength?

d. 100 GHz

4. What is the origin of the word modem?

b. Modulator/demodulator

5. With everything else being equal, which of the following transmission techniques is capable of the greatest throughput?

c. Full-duplex (answer d., "All techniques transmit data at equally high throughputs" can be considered correct, if this question is interpreted to mean the throughput of each separate channel)

6. In addition to some types of data networks, which of the following use half-duplex communication?

b. Walkie-talkies

7. In wavelength division multiplexing, two modulated signals are guaranteed to differ in what characteristic?

d. Color

8. Which of the following can increase latency on a network?

c. Adding 50 meters to the length of the network

9. You are helping to install a cable broadband system in your friend's home. She wants to bring the signal from where the service provider's cable enters the house to a room on another floor, which means you have to attach a new cable to the existing one. What type of cable should this be?

a. RG-6

10. What part of a cable protects it against environmental damage?

a. Sheath

11. With everything else being equal, a network using which of the following UTP types will suffer the most cross talk?

a. Cat 3

12. What are two advantages of using twisted pair cabling over coaxial cabling on a network?

b. Twisted pair cable is less expensive &Twisted pair cable is required for modern transmission standards.

13. Which of the following problems could be solved by using a crossover cable?

b. You're missing a connectivity device, but need to exchange data between two laptops.

14. Which of the following network transmission media offers the highest potential throughput over the longest distances?

d. SMF

15. In which of the following network links might you use SC connectors?

d. A fiber-optic connection between a server and router.

16. What type of fiber-optic cable is used most frequently on LANs?

d. Multimode fiber

17. What is the purpose of cladding in a fiber-optic cable?

b. It reflects the signal back to the core.

18. Which of the following is a potential drawback to using fiber-optic cable for LANs?

a. It is expensive.

19. In what part of a structured cabling system would you find users' desktop computers?

d. Work area

20. You've just received a new Cisco router for your data center, and it came with a rollover cable. What can you do with this cable?

a. Make a connection from the router's console port to your laptop's serial port and configure the router from your laptop.

21. What is the maximum distance specified in the structured cabling standard for a horizontal wiring subsystem?

c. 100 m

22. Which of the following can occur as a result of improper cable termination?

d. All of the above

23. If your MDF contains a 66 block, the type of cable terminating at that punch-down block is probably what?

a. UTP designed for telephone signaling

24. Your campuswide WAN is experiencing slow Internet response times. When you call your Internet service provider to ask if they can troubleshoot the problem from their end, they warn you that their responsibilities end at the demarc. What do they mean?

b. They will not diagnose problems beyond your organization's entrance facilities.

25. What is the maximum amount you should untwist twisted pair wires before inserting them into connectors?

b. ½ inch

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