Chapter 4

1. Which of the following is a characteristic of fiber-optic cable?( D)

A. It uses an intense incandescent light

B. Its core is made of highly reflective Kevlar

C. It relies on total internal cancellation to guide light for long distances

D. It is capable of higher data rates than other types of networking media

2. Which of the following describes attenuation?(A)

A.A loss of signal strength

B. An increase in signal amplitude

C. The delay experienced during signal travel

D. The time it takes a signal to teach it destination

3. Which of the following is a cause of crosstalk?(A)

A. Poorly terminated network cabling

B. The loss of a signal‘s ground reference

C. AC line noise coming from a nearly video monitor or hard disk drive

D. FM radio signal, TV signals, various types of office equipment

4. Which of the following are tests specified by the TIA/EIA-B standard for copper cable?(C.E.F)

A. signal harmonics B. Conductive response

C. Wire map D. Signal absorption

E. Insertion loss F. Propagation delay

5. What are three distinct kind of crosstalk?(A.B.E)

A. NEXT B.PEXT

C. ANEXT D.SPNEXT

E. PSNEXT

6. In designing a network, what would be used to calculate an optical link loss budget?(C)

A. Amount of data lost during impendence mismatch events

B. Amount of attenuation signal loss that can occur before data becomes corrupt

C. Amount of signal power loss that can occur without dropping below receiver requirements

D. Total of amount of data that can be lost before regeneration of signal

7. Which numbering system uses 2as its base?(C)

A. Octal B. Hexadecimal

C. Binary D. ASCII

8. Which of the following describes a common function of a cable-testing device?(D)

A. TDR test and detects faulty virtual circuits

B. TDR test provide information about the location of a cabling run

C. Wire maps provide information about the distance to a cabling fault

D. Cable testers can detect open circuits in existing cabling installations

9. Which electronic device is used to view electrical signals such as voltage waves and pulses?(D)

A. Multileter B. Autocollimator

C. Spectrum analyzer D. Oscilloscope

E. Spectroscope F. Spectophotometer

10. Through wire testing, electrical interference and signal loss can be measured. Match the names on the left column with the definitions on the right column.

答：

计算机网络第四章题库