CCNA Module 4

Module 4
1 What conditions are described when transmission signals from one wire pair affects another wire pair? (Choose two.)

*noise
resistance mismatch
jitter
*crosstalk
attenuation


2 Which of the following are detected by the wire map test? (Choose three.)

near-end crosstalk (NEXT)
*opens
propagation delay
return loss
*reversed-pair faults
*short circuits


3 To ensure reliable LAN communications, what should a technician be looking for when attaching connectors to the ends of UTP cable?

that the white-orange/orange pair is attached first
*that the wire pairs remain twisted as much as possible
that one end of the shield is properly ground but not the other
that 50 ohm termination resistors are on both ends


4 What factors need to be considered to limit the amount of signal attenuation in Ethernet cable runs? (Choose two.)

type of users
number of users
*length of cable
type of electrical equipment
*installation of connectors on the cable



5 Which of the following describes frequency?

length of each wave
height of each wave
*number of cycles each second
amount of time between each wave



6 What is expected when crosstalk is present in networks with higher transmission frequencies? (Choose two.)

jitter
*increase in crosstalk
higher signal attenuation
increases in cancellation effect
*destruction of more of the data signal



7 How are binary ones and zeros represented in fiber optic installations? (Choose two.)

+5 volts/-5 volts
0 volts/5 volts
* light/no light
high to low electrical transition
low to high electrical transition
*increasing/decreasing light intensity
8 What is a cause of crosstalk in UTP cable?

cable pairs that are shorted
cable pairs crossed during termination
cabling runs installed in separate conduit
*cable pairs that are untwisted because of poor termination of the cable


9 A small company is experiencing difficulties on its LAN. After performing some tests, a technician has determined that the copper media supporting the LAN is experiencing abnormal attenuation. What are two possible causes of the problem? (Choose two.)

* defective connectors
*excessively long cable lengths
use of higher grade cabling
low frequency signals used in the media
network cable runs isolated from other cables


10 A company needs to extend the LAN to six separate buildings. To limit the amount of signal attenuation on the LAN media, what type of media would be the best to use between the buildings?

air (wireless)
coaxial cable
*fiber
shielded twisted pair
unshielded twisted pair