GUIDED PRACTICE

Quiz: CAP Theorem

Five scenario questions with explanations and a visual checkpoint.

A AceYourInterviews editorial · 8 min study

Visual checkpoint

Use this diagram to locate the state and failure boundaries tested by the questions. Answer all five questions before revealing feedback; the result is a study checkpoint rather than a certification.

Buyer Alice → Replica A (reserve); Replica A → Partition (cannot reach B); Replica B → Partition (cannot reach A); Buyer Bob → Replica B (reserve); One-owner invariant → Replica A (requires authority); One-owner invariant → Replica B (requires authority) — Scroll to inspect the diagram, or open it at full size.

Figure — Buyer Alice → Replica A (reserve); Replica A → Partition (cannot reach B); Replica B → Partition (cannot reach A); Buyer Bob → Replica B (reserve); One-owner invariant → Replica A (requires authority); One-owner invariant → Replica B (requires authority)

Review your reasoning

After checking answers, identify the incorrect assumption behind each missed question. Rewrite it as a rule with a concrete exception or failure case, then return to the lesson.

Can both isolated replicas confirm the final seat and still guarantee that only one buyer owns it?

8:00Self-guided practice timer

The timer resets when you leave this page. Save your design separately.

Your challenge

Can both isolated replicas confirm the final seat and still guarantee that only one buyer owns it?

Your design draft

Clarify assumptions, explain your approach, and test the difficult cases. Save your draft, then compare it with the study notes.

Read study notes

Self-review checklist

I clarified the requirements and constraints.I explained why the approach works.I considered failures, boundaries, and alternatives.I identified one improvement for my next attempt.

Self-guided practice. Automated AI feedback and code execution are not connected.