Question 1

What is System Design?

Accepted Answer

System design is about planning how a system should be built by deciding its overall structure, how different components interact, and how data is managed. It involves thinking systematically about infrastructure, communication between services, and data storage.

Question 2

How to prepare for System Design Interviews?

Accepted Answer

Learn fundamental concepts like scalability, load balancing, caching, databases, microservices, and distributed systems. Practice designing real-world systems like WhatsApp, Netflix, Twitter, and Uber.

Question 3

What are CAP Theorem and ACID?

Accepted Answer

CAP Theorem states you can have Consistency, Availability, or Partition tolerance. ACID ensures database transactions are reliable with Atomicity, Consistency, Isolation, and Durability.

Question 4

What is the difference between HLD and LLD?

Accepted Answer

High-Level Design (HLD) defines the overall system architecture — services, databases, APIs, load balancers, and how they communicate. Low-Level Design (LLD) focuses on the internal design of individual components — class structures, design patterns, SOLID principles, and code organization. Both are tested in software engineering interviews.

Question 5

Is this system design course free?

Accepted Answer

Yes! Crack System Design offers free preview content covering core system design topics including scalability, databases, caching, load balancing, and architecture patterns. A full ebook with all 56+ HLD topics and 76+ LLD concepts is available for purchase.

Question 6

What topics are covered in system design interviews?

Accepted Answer

System design interviews typically cover: load balancing, caching, database sharding, microservices, message queues, CAP theorem, API design (REST, GraphQL, gRPC), and real-world system designs like designing WhatsApp, Netflix, Twitter, Uber, and URL shorteners.

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