CompTIA Network+ - CH5 - Network Cabling
Which fiber transceiver is the same size as SFP transceivers, but can support network speeds over 10 Gbps?
SFP+
Which part of a toner and probe kit emits an audible tone when it detects electrical activity on a wire pair? a. TDR b. Tone generator c. Tone locator d. Toner
c. Tone locator
What is a twist ratio, and why is it important?
The number of twists per meter or foot. The more twists per foot in a pair of wires, the more resistant the pair will be to cross-talk or noise.
Why do APC ferrules create less back reflection than UPC ferrules?
The end faces are placed at an angle to each other, so the reflection is sent back in a different direction than the source of the signal.
Which kind of multiplexing assigns slots to nodes according to priority and need? a. WDM (wavelength division multiplexing) b. STDM (statistical time division multiplexing) c. TDM (time division multiplexing) d. CWDM (coarse wavelength division multiplexing)
b. STDM (statistical time division multiplexing)
Suppose you're creating patch cables to be used in a government office. What color wire goes in the first pin? a. White/orange b. White/green c. Brown d. Blue
b. White/green
Which of these categories of twisted-pair cable can support Gigabit Ethernet? a. Cat 5, Cat 6, Cat 7 b. Cat 5e, Cat 6, Cat 3 c. Cat 5e, Cat 6a, Cat 7 d. Cat 6, Cat 7a, Cat 5
c. Cat 5e, Cat 6a, Cat 7
What is the earliest twisted-pair cabling standard that meets the minimum requirements for 10GBase-T transmissions? a. Cat 5e b. Cat 5 c. Cat 6a d. Cat 7
c. Cat 6a
What fiber is used in fiber-optic cabling to protect the inner core and prevent the cable from stretching?
Kevlar, a polymeric fiber
Why is SMF more efficient over long distances than MMF?
The core of SMF is much narrower than that of MMF, and reflects very little. The light does not disperse as much along the fiber.
Which transmission characteristic is never fully achieved? a. Latency b. Throughput c. Bit rate d. Bandwidth
d. Bandwidth
Which kind of crosstalk occurs between wire pairs near the source of the signal? a. Alien b. TX/RX reverse c. FEXT d. NEXT
d. NEXT
Suppose you're assisting with a cable installation using fiber-optic cabling that will support Gigabit Ethernet. You're approved to install segments up to 4000 m in length. What kind of cable are you using?
SMF
How is latency measured, and in what unit?
By calculating a packet's RTT, or the length of time it takes for a packet to go from sender to receiver, then back from receiver to sender. RTT is usually measured in milliseconds. (Round Trip Time)
What kind of tool can measure the distance to the location of damage in a cable?
Cable performance tester
What is the difference between short circuits and open circuits?
Open circuit means there is no complete path whereas a short circuit there is a complete path but the flow is not in the way it was intended.
What characteristic of optical transmissions is primarily responsible for the distance limitations of fiber-optic cabling?
Optical loss, which is the degradation of the light signal after it travels a certain distance away from its source
What kind of cable uses BNC connectors? Which connector is likely to be used by cable TV? a. Coaxial cable, F-connector b. Twisted-pair cable, RJ-11 c. Copper cable, RJ-45 d. Fiber-optic cable, MTRJ
a. Coaxial cable, F-connector
Which fiber connector contains two strands of fiber in each ferrule? a. MTRJ b. SC c. ST d. LC
a. MTRJ
What type of fiber cable problem is caused when pairing a 50-micron core cable with a 62.5-micron core cable? a. Dirty connectors b. Wavelength mismatch c. Fiber type mismatch d. TX/RX reverse
c. Fiber type mismatch