Free FOA Certified Fiber Optic Specialist, Design certification exam Practice Questions

Sample Practice Questions

Try these 10 sample questions from the FOA Certified Fiber Optic Specialist, Design certification exam practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1Before selecting cable for a new network, which information should establish the design requirements?

   1. A. The distributor's current cable inventory and reel sizes
   2. B. The required communications services, speeds and distances
   3. C. The installation crew's preferred connector and splice methods
   4. D. The labeling scheme and final acceptance report format

   Answer: B

   Explanation: FOA states, "One must first look at the types of equipment required for the communications systems, the speed of the network and the distances to be covered before considering anything related to the cable plant." The services and their performance requirements control the design; purchasing, installation preferences and report formats do not establish those requirements.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — The Communications System

2. 2Who should participate when a fiber designer coordinates a project that also includes building construction and IT systems?

   1. A. The cable supplier alone, because component selection determines every requirement
   2. B. The fiber installer alone, because construction drawings do not affect cabling
   3. C. The purchasing department alone, because vendor selection settles the technical design
   4. D. Relevant IT staff, building designers and contractors involved in the project

   Answer: D

   Explanation: FOA states, "Designing a network requires working with other personnel involved in the project, even beyond the customer." The paragraph includes IT engineers, architects, engineers and construction contractors. Their interfaces require coordination; a single supplier, installer or purchasing function cannot represent them all.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — Working With Others

3. 3A cable route is 2.4 km long. What is that length in meters?

   1. A. 24 m
   2. B. 240 m
   3. C. 2400 m
   4. D. 24,000 m

   Answer: C

   Explanation: FOA states, "1000 meters / 3,281 feet / 0.62 miles." A kilometer is 1000 meters, so 2.4 × 1000 = 2400 m. The other values apply incorrect powers of ten.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Jargon - Illustrated — The Metric System — Kilometer

4. 4An OSP route crosses properties controlled by several organizations. What should the design schedule allow for before construction?

   1. A. A single approval from the cable equipment supplier
   2. B. Permission only from the owner of the endpoint building
   3. C. Approval from the entities controlling the proposed route
   4. D. A permit obtained after each completed cable segment

   Answer: C

   Explanation: FOA advises, "And you have to plan for adequate time to get approval from everyone who is involved." Route permissions can involve multiple controlling entities. Supplier approval, endpoint permission alone or approval after construction does not resolve those access requirements.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — Planning The Route — Site Visits

5. 5How should the backup for a fiber project's main manager be prepared?

   1. A. Be involved enough to answer most questions, with authority limits understood
   2. B. Receive only the final report after the main manager becomes unavailable
   3. C. Assume full decision authority without being briefed on the design
   4. D. Handle purchasing without knowing the project's personnel or schedule

   Answer: A

   Explanation: FOA states, "The backup person should also be involved to such a degree that they can answer most questions, may even be more technically savvy on the project, but may not have full decision-making authority." A prepared backup supports continuity without assuming authority that has not been assigned. Late briefing, uninformed decisions and isolation from project information undermine that role.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — Planning for the Installation — The Project Manager

6. 6Estimate the loss of a 4 km fiber path with attenuation of 0.4 dB/km, four mated connections at 0.3 dB each and two splices at 0.1 dB each. What is the total?

   1. A. 3.0 dB
   2. B. 1.6 dB
   3. C. 2.8 dB
   4. D. 4.8 dB

   Answer: A

   Explanation: FOA states, "multiplying the length (km) by the attenuation coefficient (dB/km), then adding the loss from connectors and/or splices" Fiber loss is 4 × 0.4 = 1.6 dB, connection loss is 4 × 0.3 = 1.2 dB, and splice loss is 2 × 0.1 = 0.2 dB. Their sum is 3.0 dB. The alternatives omit terms or incorrectly combine them.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Data Links — Loss Budgets

7. 7Existing building drawings omit a wall that obstructs the proposed cable path. How should the designer establish a usable route?

   1. A. Retain the original drawing and resolve its discrepancies only during cable pulling
   2. B. Plan from the original drawing and defer checking the route until final acceptance
   3. C. Check the equipment rooms but leave the intermediate cable path unverified
   4. D. Inspect the actual route and revise the drawing to record the obstacles found

   Answer: D

   Explanation: FOA states, "mark up drawings to reflect reality, especially all obstacles to running cabling and hardware and walls requiring firestopping that are not on the current drawings." The route must be inspected and the drawing corrected to reality. A and B postpone discovering known drawing errors; C checks endpoints but not the obstructed path.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — Planning The Route — Site Visits

8. 8A project manager lacks the technical competence to judge a serious installation defect. What staffing arrangement supports proper site control?

   1. A. Allow each crew to decide whether its own work needs correction
   2. B. Defer all technical decisions until the customer's final payment review
   3. C. Provide a qualified technical person authorized to stop work or require fixes
   4. D. Replace technical oversight with the supplier's product warranty paperwork

   Answer: C

   Explanation: FOA states, "If the project manager is not technically qualified, having someone available who is technical is important. That person should have the authority to stop work or require fixes if major problems are found." Qualified oversight with appropriate authority can address major defects. Self-approval, delayed review or warranty records do not fill the manager's technical competence gap.

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — Planning for the Installation — Developing A Project Checklist

9. 9A transmitter's minimum output is −3 dBm and its receiver sensitivity is −21 dBm. What is their optical power budget before reserving any margin?

   1. A. 3 dB
   2. B. 21 dB
   3. C. 24 dB
   4. D. 18 dB

   Answer: D

   Explanation: FOA states, "The power budget is the difference between the output power of the transmitter and the input power requirements of the receiver." Subtract receiver sensitivity from minimum transmitter output: −3 − (−21) = 18 dB. The alternatives use the magnitude of transmitter output alone (3), the magnitude of receiver sensitivity alone (21), or the sum of the two magnitudes (24).

   Reference: The FOA Reference For Fiber Optics - Fiber Optic Data Links — Power Budget

10. 10What is the principal design purpose of a cable plant loss budget?

    1. A. Estimate passive link loss for comparison with the transmission system's allowance
    2. B. Determine the transmitter-to-receiver power allowance from their active specifications
    3. C. Determine the maximum data rate solely from the fiber's bandwidth specification
    4. D. Measure the received data's error rate while the complete system is operating

    Answer: A

    Explanation: FOA states, "It is used to estimate the loss of a cable plant being installed, determine if the cable plant will work with any given transmission system and provide an estimate for comparison to actual test results." The cable loss budget estimates passive loss. B describes the active power budget, C a bandwidth limit, and D an operating-system error measurement.

    Reference: The FOA Reference For Fiber Optics - Fiber Optic Network Design — Cable Plant Link Loss Budget Analysis, opening paragraph