CCNA 4

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. What conditions are described when transmission signals from one wire pair affects another wire pair? (Choose two.)
• noise
• resistance mismatch
• jitter
• crosstalk
• attenuation

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. 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