What LLD covers vs HLD - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

Difference between LLD and HLD focus areas

Which of the following best describes the primary focus of Low-Level Design (LLD) compared to High-Level Design (HLD)?

A LLD focuses on user interface design; HLD focuses on network protocols

B LLD defines system architecture and components; HLD specifies database schemas

C LLD details module internals and algorithms; HLD outlines system architecture and components

D LLD describes business goals; HLD describes coding standards

💡 Hint

Think about which design level zooms into the details inside modules.

LLD breaks down system components into detailed modules and algorithms, while HLD provides an overview of system architecture and major components.

❓ Architecture

intermediate

Components described in HLD vs LLD

Which components are typically described in High-Level Design but not in Low-Level Design?

A System modules and their interactions

B Class diagrams and method implementations

C Database table structures and indexes

D Detailed API request and response formats

💡 Hint

Consider which design level shows the big picture of the system.

HLD shows system modules and their interactions, while LLD focuses on internal details like classes and methods.

❓ scaling

advanced

How LLD supports scalability compared to HLD

In what way does Low-Level Design (LLD) contribute to system scalability differently than High-Level Design (HLD)?

A LLD creates deployment diagrams; HLD creates class diagrams

B LLD optimizes algorithms and data structures; HLD plans distributed system components

C LLD manages user roles; HLD manages database replication

D LLD defines network topology; HLD writes code for caching

💡 Hint

Think about how detailed design affects performance inside modules.

LLD focuses on optimizing algorithms and data structures for performance, while HLD plans system distribution and component scaling.

❓ tradeoff

advanced

Tradeoffs between LLD and HLD detail levels

What is a key tradeoff when choosing the level of detail between High-Level Design (HLD) and Low-Level Design (LLD)?

A HLD is only for small projects; LLD is only for large projects

B HLD requires coding skills; LLD requires business analysis

C HLD focuses on UI design; LLD focuses on database tuning

D HLD is faster to create but less precise; LLD is detailed but time-consuming

💡 Hint

Consider the effort and precision involved in each design level.

HLD provides a broad overview quickly but lacks detail; LLD provides detailed design but takes more time and effort.

❓ estimation

expert

Estimating effort for LLD vs HLD in a large system

You are tasked with designing a large, complex system. Which statement best estimates the relative effort required for Low-Level Design (LLD) compared to High-Level Design (HLD)?

A LLD requires significantly more effort than HLD due to detailed module design

B LLD and HLD require equal effort since both cover the entire system

C LLD requires less effort than HLD because it reuses existing components

D LLD requires no effort if HLD is well done

💡 Hint

Think about the depth of detail and documentation needed for each design level.

LLD involves detailed design of each module, which is more time-consuming than the broader HLD.