The Citadel NXT online assessment (90 to 120 minutes) starts with multiple-choice questions, 8, 14, about 15 or a dozen or so depending on the report, followed by one or two coding problems. Reported multiple-choice topics:
One commenter says the multiple-choice questions are much the same every year.
What passers do: One candidate found the multiple-choice section not very hard: university OS and distributed-systems material.; One candidate passed the OA without being sure how.
Edge cases probed: Which of three shuffle implementations are fair; Write-back vs. write-through caching; Forward vs. reverse proxy; Deadlock; Advantages of NoSQL; Replica control; Space-complexity differences between implementations of the same algorithm
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What you just read — canonical solution, follow-up arc, what passing candidates actually did — exists for all 62 Citadel questions, refreshed monthly from new candidate reports.