CCNA 1 v3.1

Module 4 Review

2

What describes frequency? What describes frequency?

• number of cycles each second

3

What are 3 characteristics of sine waves?

What are 3 characteristics of sine waves?

• They repeat the same pattern at regular intervals.

• They occur naturally and change regularly over time.

• No two adjacent points on a graph have the same value.

4

What are 2 common ways in which the capacities of communication

systems are measured?

What are 2 common ways in which the capacities of communication

systems are measured?

• analog bandwidth

• digital bandwidth

5

What are 2 reasons why fiber optic installations would be favored over

copper between buildings?

What are 2 reasons why fiber optic installations would be favored over

copper between buildings?

• attentuation properties

• no electrical interference

6

What are 2 ways binary ones and zeros are represented in fiber

optic installations?

What are 2 ways binary ones and zeros are represented in fiber

optic installations?

• light/no light

• increasing/decreasing light intensity

7

What are 3 factors that contribute to attenuation in a

copper media?

What are 3 factors that contribute to attenuation in a

copper media?

• long cable lengths

• defective connectors

• energy leaks through the insulation of the cable

8

What are 2 problems associated with impedance mismatches in

copper cabling?

What are 2 problems associated with impedance mismatches in

copper cabling?

• jitter

• reflection

9

What are 2 conditions describing the transmission of signals from one wire pair which affects another wire pair?

What are 2 conditions describing the transmission of signals from one wire pair which affects another wire pair?

• noise

• crosstalk

10

What type of wiring problem is depicted in this sample of a

cable tester?

What type of wiring problem is depicted in this sample of a

cable tester?

• an open

11

What 2 factors need to be considered to limit the amount of

signal attenuation in long Ethernet cable runs?

What 2 factors need to be considered to limit the amount of

signal attenuation in long Ethernet cable runs?

• Type of media

• Length of cable

12

What are 3 tests specified by the TIA/EIA-568-B standard for copper

cable?

What are 3 tests specified by the TIA/EIA-568-B standard for copper

cable?

• wire map

• insertion loss

• propagation delay

13

What best describes amplitude?

What best describes amplitude?

• The height of each wave

14

In a new network installation, the network administrator has decided to use a

medium that is not affected by electrical noise. Which cable type will best meet

this standard?

In a new network installation, the network administrator has decided to use a

medium that is not affected by electrical noise. Which cable type will best meet

this standard?

• fiber optic

15

Which of the following are true concerning crosstalk?

(Choose three.)

Which of the following are true concerning crosstalk?

(Choose three.) • FEXT is less of a problem than is NEXT.• Using frequency step sizes that are larger than those

specified by the TIA/EIA standard has no effect on link fault detection.

• A cable with a NEXT measurement of 30 dB would be considered a better cable than one which has a NEXT measurement of 10 dB.

• NEXT needs to be measured from each pair to each other pair in a UTP link, and from both ends of the link.

• FEXT is determined by injecting a signal into a pair of wires and measuring the signal strength on the other end of the same pair of wire.

• FEXT is less of a problem than is NEXT.• Using frequency step sizes that are larger than those

specified by the TIA/EIA standard has no effect on link fault detection.

• A cable with a NEXT measurement of 30 dB would be considered a better cable than one which has a NEXT measurement of 10 dB.

• NEXT needs to be measured from each pair to each other pair in a UTP link, and from both ends of the link.

• FEXT is determined by injecting a signal into a pair of wires and measuring the signal strength on the other end of the same pair of wire.

16

Which frequencies are used by a cable tester to measure

attenuation?

Which frequencies are used by a cable tester to measure

attenuation?

• the highest frequencies that the cable is rated to support

17

What are 3 characteristics about square waves?

What are 3 characteristics about square waves?

• They repeat the same pattern at regular intervals.

• They repeat the flat pattern on both the top and bottom of the wave.

• They do not continuously vary with time.

18

What are 2 purposes of shielding in copper based media?

What are 2 purposes of shielding in copper based media?

• protect one pair of wires within the cable from noise generated by electrical signals on another pair of wires

• protect the data signal from external sources of noise

19

What are pulses and why are they important in digital communication?

(Choose two.)

What are pulses and why are they important in digital communication?

(Choose two.)

• irregular accidental spikes in energy levels

• determine the value of the data being transmitted

• create the timing mechanism for data transmission

• increases in energy which damage data

transmissions

• deliberate, fixed disturbances of predictable

duration

• irregular accidental spikes in energy levels

• determine the value of the data being transmitted

• create the timing mechanism for data transmission

• increases in energy which damage data

transmissions

• deliberate, fixed disturbances of predictable

duration

20

Two wires from different wire pairs are connected to the wrong pins on both ends of a cable. What is

the wire fault name for this connection?

Two wires from different wire pairs are connected to the wrong pins on both ends of a cable. What is

the wire fault name for this connection?

• Split-pair

21

What 3 issues are detected by the wire map test?

What 3 issues are detected by the wire map test?

• Opens

• Reversed-pair faults

• Short circuits

22

What cable test verifies that all eight wires are

connected to the correct pins on both ends of the

cable?

What cable test verifies that all eight wires are

connected to the correct pins on both ends of the

cable?

• Wire map test

23

To ensure reliable LAN communications, what should

a technician be looking for when attaching connectors to

the ends of UTP cable?

To ensure reliable LAN communications, what should

a technician be looking for when attaching connectors to

the ends of UTP cable?

• The wire pairs remain twisted as much as possible

24

What type of shielding does data coaxial cable use?

What type of shielding does data coaxial cable use?

• braided conductive

• foil-screened