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

86 questions in Networking.

Quiz

A video platform moves from HTTP/2 over TCP to HTTP/3 over QUIC. Which specific problems does this solve for video delivery, and what new operational costs appear?

You migrate a mobile API to HTTP/2 and p99 latency gets worse for users on cellular networks, while p50 improves. Explain and decide what to do.

A chat platform's Layer 7 proxy tier holds millions of WebSocket connections. Every proxy deployment disconnects everyone. What would you change?

A service has widely varying request costs — most complete in 10 ms, some take 5 s. Under round robin some instances are overwhelmed while others idle. What do you change?

One instance passes its health checks but serves requests ten times slower than its peers. Why is it still receiving traffic and what would you change?

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 batch job's networking costs are three times its compute cost. It reads several terabytes from object storage. What is happening?

A platform running thousands of concurrent isolated sessions starts seeing intermittent connection failures to external sites. Ports are available and CPU is low. What is the likely cause?

A service intermittently times out connecting to a managed database. The database is healthy, nothing changed, and failures correlate with traffic volume. Where do you look?

An observability platform's cloud bill shows an unexpectedly large data-processing charge from NAT gateways. What is happening, and what are the architectural fixes?

A blockchain infrastructure provider serves RPC requests where a small number of query types are enormously more expensive than the rest. How should the request path be structured?

An API platform serving millions of external developers must place authentication, rate limiting, quotas, retries, idempotency and tenant isolation. Which belong at the gateway and which must live deeper?