Free BICSI DCDC Sample Quiz — 10 Questions

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1. Question 01 · Concept Planning & Analysis

   A regional bank must move customer account data out of colocation because regulators now require the institution to maintain direct physical control of the hardware and its audit trails. The board keeps calling the project "our new cloud." Which business driver should actually shape the design?

   1. AControl and compliance — regulated data that must live in a company-controlled building with auditable physical securityCorrect answer
   2. BGrowth — the bank has outgrown its colocation footprint
   3. CCost reduction — at this scale, owning always beats renting
   4. DLatency — the trading desks need single-digit millisecond response

   The regulator mandate is the driver, and it forces physical control and auditability into the design. Cost and growth are real pressures but neither explains the mandate; latency belongs to a different workload entirely.

2. Question 02 · Concept Planning & Analysis

   Site A offers the region's cheapest industrial power rate, but the utility quotes a four-year queue for the substation upgrade your ultimate load needs. Site B's rate is 15% higher, but capacity is available on your schedule. Applying the chapter's criterion ranking, which site leads and why?

   1. ANeither — pick a third site
   2. BSite B — power availability is criterion number one; you can negotiate rates but not physics, and a multi-year queue kills projects while cost is modeled, not wished awayCorrect answer
   3. CSite A — queues always clear early
   4. DSite A — power cost dominates the 15-year opex model

   Availability outranks cost: "you cannot negotiate physics." The queue is a schedule-killer; the rate difference is a modeling input. (B) assumes away the constraint.

3. Question 03 · Concept Planning & Analysis

   The geotechnical report shows poor bearing soils at a candidate site. Why does this matter in concept planning rather than later?

   1. AAll soils support slab-on-grade equally
   2. BGeotechnical work is strictly a construction-phase activity
   3. CBearing capacity determines foundation type and cost — a concept-phase capex input that can reorder the site rankingCorrect answer
   4. DSoil conditions only affect landscaping choices

   Foundation cost driven by soils is a site-selection variable, not a detail to discover after choosing. A site needing deep foundations can lose to a runner-up once the real capex is modeled.

4. Question 04 · Systems: Architectural/Space/Mechanical/Electrical

   A developer is planning an enterprise data center with 20,000 sq ft of gross building area. Using the common enterprise planning figure that white space runs roughly 40–60% of gross area, about how much floor area should be planned for racks?

   1. A16,000 sq ft
   2. B20,000 sq ft
   3. C2,000 sq ft
   4. D10,000 sq ftCorrect answer

   At a 50% planning figure (illustrative, inside the 40–60% range), 20,000 × 0.5 = 10,000 sq ft of white space; the rest goes to support functions. D is the trap — the answer is never "all of it," because support space competes for the same building.

5. Question 05 · Systems: Architectural/Space/Mechanical/Electrical

   The cooling tower vendor's proposal lists water consumption from evaporation, drift, and blowdown. The owner asks why a cooling device consumes water at all. What is the answer?

   1. ATowers reject the chiller's heat to the atmosphere by evaporating water, and water also leaves as drift (carried droplets) and blowdown (discharged to control mineral buildup) — which is why water availability was a site-selection criterionCorrect answer
   2. BOnly the pumps consume water
   3. CIt doesn't — the vendor is padding the proposal
   4. DWater is consumed only during maintenance

   Evaporative heat rejection *is* water consumption: evaporation carries the heat away, drift escapes as droplets, and blowdown purges concentrated minerals. That's the physical reason a water-cooled plant ties the site to a water supply.

6. Question 06 · Systems: IT / Ancillary / Communications Connectivity

   A network engineer traces a packet from a VM in Rack 12 to a VM in Rack 30. It crosses exactly two switches: up from the rack switch to a core switch, then back down to the destination rack switch. Which topology produces this pattern?

   1. AThree-tier core/aggregation/access
   2. BSpine-leaf fabricCorrect answer
   3. CRing topology
   4. DCollapsed backbone with daisy-chained IDAs

   Spine-leaf is defined by the two-hop rule: leaf to spine to leaf, with no leaf talking directly to another leaf. A three-tier design would cross four or five hops through an aggregation layer.

7. Question 07 · Systems: IT / Ancillary / Communications Connectivity

   Dust from construction triggers a smoke detector in a single-interlock pre-action zone. No sprinkler head has fused. What happens?

   1. AFull sprinkler discharge
   2. BThe clean agent dumps
   3. CDetection admits water into the piping, but no sprinkler discharges until a head fusesCorrect answer
   4. DNothing at all

   Single interlock: detection charges the pipes with water; fused heads are still required for discharge. The pipes are now wet and waiting — which is exactly why data halls prefer double interlock.

8. Question 08 · Data Center Operations & Maintenance Assessment

   A colocation customer's IT load dropped from 900 kW to 450 kW after a virtualization project, and the site's PUE climbed from 1.45 to 1.78. Total facility energy use fell by 380 kW. The facility manager wants a project to "fix the PUE." What should the assessment recommend instead?

   1. AReplacing the UPS because a PUE of 1.78 indicates UPS failure
   2. BRecomputing PUE with a different formula that excludes lighting
   3. CAdding load banks to push IT load back up and restore the old PUE
   4. DTargeting the newly freed fixed overhead — consolidate UPS modules, shut down unneeded CRAH units, raise setpointsCorrect answer

   This is the textbook denominator effect: fixed overhead didn't shrink proportionally with IT load, so PUE rose while total energy fell. The building is cheaper to run, not broken. The right move is shedding stranded overhead to right-size the plant to the new load — not chasing the ratio itself. Adding load banks (B) would burn energy to make a number look good.

9. Question 09 · Security Assessment

   A threat model describes: "Asset — the UPS and switchgear rooms. Threat actor — a trespasser who enters through the propped loading dock door. Attack vector — crossing the warehouse to the electrical room. Vulnerability — the electrical room door is never locked because maintenance finds it inconvenient." Which link in the chain identifies *how* the trespasser reaches the asset?

   1. AThe attack vector — crossing the warehouse from the loading dockCorrect answer
   2. BThe threat actor — the trespasser
   3. CThe vulnerability — the unlocked electrical room door
   4. DThe asset — the UPS and switchgear rooms

   The attack vector is the *how*: the path the attacker takes to reach the asset. The vulnerability (C) is the weakness exploited along that path, not the path itself. The asset (A) is the *what*, and the threat actor (B) is the *who*.

10. Question 10 · Construction Administration & Commissioning

    The contractor submits product data for the UPS battery strings, but the cut sheets show a 10-minute runtime at full load while the specification requires 15 minutes. The reviewer marks the discrepancy on the submittal and sends it back. Which disposition applies, and may the contractor order the batteries?

    1. AApproved — the reviewer's marks are advisory only
    2. BRevise and Resubmit — the contractor must correct the submittal and may not proceed until it is re-reviewedCorrect answer
    3. CApproved as Noted — the contractor may proceed and sort out the runtime later
    4. DRejected — the contractor is barred from submitting battery product data again on this project

    Revise and Resubmit means "don't proceed; fix the noted issues and send it back." The runtime shortfall is a conformance failure against the spec, so procurement must wait for a corrected, re-reviewed submittal. A is the trap: "Approved as Noted" means proceed *with* the corrections incorporated, and a wrong runtime isn't a minor mark — it's a non-conformance. D overstates Rejected, which means start the submittal over, not that the contractor is barred from resubmitting.

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