CompTIA Network+ Question D-5

A network technician has been asked to make the connections necessary to add video transported via fiber optics to the LAN within a building. Which of the following is the MOST common connector that will be used on the switch to connect the media converter?

B. Fiber coupler

Correct Answer: D

CompTIA Network+ Question C-87

Which of the following communication technologies would MOST likely be used to increase bandwidth over an existing fiber optic network by combining multiple signals at different wavelengths?


Correct Answer: A

Dense wavelength-division multiplexing (DWDM) is a high-speed optical network type commonly used in MANs (metropolitan area networks). DWDM uses as many as 32 light wavelengths on a single fiber, where each wavelength can support as many as 160 simultaneous transmissions using more than eight active wavelengths per fiber.

CompTIA Network+ Question C-12

A network technician must utilize multimode fiber to uplink a new networking device. Which of the following Ethernet standards could the technician utilize? (Select TWO).

A. 1000Base-LR
B. 1000Base-SR
C. 1000Base-T
D. 10GBase-LR
E. 10GBase-SR
F. 10GBase-T

Correct Answer: BE

1000BASE-SX is a fiber optic Gigabit Ethernet standard for operation over multi-mode fiber with a distance capability between 220 meters and 550 meters. 10Gbase-SR is a 10 Gigabit Ethernet LAN standard for operation over multi-mode fiber optic cable and short wavelength signaling.

CompTIA Network+ Question C-9

A T1 line has lost connectivity to the ISP. The ISP has instructed the technician to place a loopback on a device connecting the T1 line to their central office. On which of the following devices will the technician implement the loopback?

A. Channel remote module
B. Fiber optic modem
C. Channel service unit
D. Digital subscriber line modem

Correct Answer: C

CompTIA Network+ Question B-94

A technician is tasked with connecting a router to a DWDM. The technician connects the router to the multiplexer and confirms that there is a good signal level. However, the interface on the router will not come up. Which of the following is the MOST likely cause?

A. The wrong wavelength was demuxed from the multiplexer.
B. The SFP in the multiplexer is malfunctioning.
C. There is a dirty connector on the fiber optic cable.
D. The fiber optic cable is bent in the management tray.

Correct Answer: A

A multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. A demultiplexer (or demux) is a device taking a single input signal and selecting one of many data-output-lines, which is connected to the single input. Since the signal going in is good, the problem must be with the signal output. If the correct wavelength was demultiplexed, the interface will be displayed on the router.

CompTIA Network+ Question A-42

A network technician has configured a point-to-point interface on a router, however, once the fiber optic cables have been run, the interface will not come up. The technician has cleaned the fiber connectors and used an optical power meter to confirm that light is passing in both directions without excessive loss. Which of the following is the MOST likely cause?

A. Distance limitation
B. Wavelength mismatch
C. cross-talk
E. Macro bend

Correct Answer: B

CompTIA A+ Question D-15

Which of the following cable types is LEAST affected in areas of high EMI?

B. Coax
D. Fiber

Correct Answer: D

Fiber optic cable is not affected by electro magnetic interference because it is related to optics technology and doesn’t have parts that might be affected by EMI.