Quiz

2627 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2627 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture77 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture85 Cost Architecture & FinOps82 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization82 AI-Era Architecture86 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture88 Streaming & Real-Time Data93 Data Governance & Semantics81 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk88

Difficulty Any beginner intermediate advanced

3 questions in Networking.

Quiz

At 09:00 a team creates the DNS record for a new regional endpoint. It resolves from their laptops at once, but part of the fleet keeps getting NXDOMAIN until about 09:20 even though the record's TTL is 60 seconds. Why?

Six backends sit behind one load balancer: two in zone A and four in zone B. The zone A pair runs at 70% CPU while the zone B four sit at 25%. The load balancer's per-zone request counts are even and no target is unhealthy. What is happening?

A 180 KB JSON response takes about 400 ms to reach a client 90 ms away on a connection whose handshake has just finished. The handler took 12 ms and the link has 200 Mbps spare. Measuring from the moment the request is written, what sets the floor?