Final Review

Comprehensive Review Consolidate your knowledge across all modules

~4 hours Modules 1–8 Self‑paced

This comprehensive review consolidates the key concepts from every module. Use this as your final study guide before the exam. Each section highlights the most important topics, tools, and patterns you need to master.

Module Summaries

M1: Foundations

  • Full‑stack architecture layers
  • HTTP/HTTPS, DNS, web infrastructure
  • Architectural styles & decision making

M2: Frontend (React)

  • Components, props, state, hooks
  • Context API & custom hooks
  • Client‑server interaction (Fetch/Axios)
  • React Query & optimistic updates
  • UI/UX, accessibility, responsive design

M3: Data Management

  • Relational DB: SQL, normalization, ACID
  • NoSQL: Document, KV, Graph, Column
  • Caching strategies (Redis, CDN)
  • ORM: Active Record & Data Mapper

M4: Backend

  • Node.js event loop & Express
  • Middleware, routing, error handling
  • Authentication: JWT, Sessions, OAuth2
  • Role‑Based Access Control (RBAC)

M5: System Design & Deployment

  • Architectural patterns (monolith/microservices)
  • Git branching strategies & PR workflows
  • Docker: images, containers, Compose
  • CI/CD: GitHub Actions / GitLab CI
  • Cloud: IaaS, PaaS, Serverless

M6: Advanced Topics

  • Performance: bundling, lazy loading, caching
  • Real‑time: WebSockets, Socket.io, SSE
  • Monitoring: Prometheus, Grafana, logging
  • Testing: Unit, Integration, E2E (Jest, Cypress)

M7: Capstone

  • Architecture planning & tech stack selection
  • Full‑stack implementation (frontend + backend)
  • Emerging tech: AI/LLM, Edge, Wasm
  • Testing & performance reporting

M8: Specialization

  • Choose your backend framework
  • Framework‑specific patterns and best practices
  • Comparative analysis (if Track G)

Self‑Assessment Quiz

Test your recall with these key questions. Click to reveal the answers.

Question 1

What is the difference between authorization and authentication?

Show answer
Authentication verifies who a user is (login/identity). Authorization determines what a user is allowed to do (permissions/roles).

Question 2

How does React's Virtual DOM improve performance?

Show answer
React maintains a lightweight copy of the real DOM. When state changes, it computes the minimal set of changes (diffing) and applies only those updates to the real DOM, reducing expensive reflows and repaints.

Question 3

Explain the CAP theorem in distributed systems.

Show answer
CAP states that a distributed system can guarantee at most two of: Consistency (every read gets the latest write), Availability (every request gets a response), and Partition tolerance (system continues despite network failures). Most systems choose AP with eventual consistency.

Question 4

What is the N+1 query problem in ORMs and how is it solved?

Show answer
N+1 occurs when an ORM executes one query for parent entities and then N additional queries for their children. Solved by eager loading (e.g., include or join) to fetch all data in a single query.

Question 5

List three caching patterns and briefly describe each.

Show answer
Cache‑Aside: App checks cache; on miss, fetches from DB and stores it. Write‑Through: Writes go to cache first, then synchronously to DB. Write‑Behind: Writes go to cache, then asynchronously to DB (higher throughput, risk of data loss).