What high level design encompasses in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify a key component of high level design.

HLD

High level design primarily focuses on [1] of the system.

Drag options to blanks, or click blank then click option'

Aarchitecture

Bcoding

Cdebugging

Dtesting

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing design with coding or testing.

High level design mainly deals with the architecture or overall structure of the system.

2fill in blank

medium

Complete the code to specify what high level design defines.

HLD

High level design defines the [1] between system components.

Drag options to blanks, or click blank then click option'

Auser interface

Bcode syntax

Cdatabase schema

Ddata flow

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing UI design or database details with high level design.

High level design shows how data flows between different parts of the system.

3fill in blank

hard

Fix the error in the statement about high level design.

HLD

High level design does not include detailed [1] of each module.

Drag options to blanks, or click blank then click option'

Auser manuals

Btesting plans

Ccode implementation

Ddeployment scripts

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking high level design covers coding details.

High level design does not include detailed code implementation; it focuses on overall structure.

4fill in blank

hard

Fill both blanks to describe what high level design includes.

HLD

High level design includes [1] and [2] of system components.

Drag options to blanks, or click blank then click option'

Astructure

Bdetailed code

Cinteraction

Dtest cases

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing design with coding or testing.

High level design includes the structure and interaction of system components.

5fill in blank

hard

Fill all three blanks to complete the description of high level design.

HLD

High level design defines [1], [2], and [3] of the system.

Drag options to blanks, or click blank then click option'

Aarchitecture

Bcomponent interaction

Cdata flow

Dcode syntax

Attempts:

3 left

💡 Hint

Common Mistakes

Including code syntax as part of high level design.

High level design defines architecture, component interaction, and data flow of the system.

Practice

1. What does a high level design (HLD) primarily show in a system?

easy

A. The user interface colors and fonts

B. The main components and how they connect

C. The detailed database schema

D. The exact code for each module

Solution

1. Step 1: Understand the purpose of HLD

   HLD focuses on the big picture, showing main parts and their relationships.

2. Step 2: Differentiate from detailed design

   Detailed code or UI specifics are not part of HLD but come later in design phases.

3. Final Answer:

   The main components and how they connect -> Option B

4. Quick Check:

   HLD = Big parts and connections [OK]

Hint: HLD = big parts + connections, not code or UI [OK]

Common Mistakes:

• Confusing HLD with detailed design
• Thinking HLD includes UI styling
• Assuming HLD shows exact code

2. Which of the following is a correct element to include in a high level design document?

easy

A. Component diagrams showing system parts

B. Detailed API code snippets

C. Exact SQL queries for database

D. Pixel-perfect UI mockups

Solution

1. Step 1: Identify typical HLD contents

   HLD includes diagrams of components and their interactions, not code or UI details.

2. Step 2: Eliminate incorrect options

   Code snippets, SQL queries, and UI mockups belong to detailed design or implementation.

3. Final Answer:

   Component diagrams showing system parts -> Option A

4. Quick Check:

   HLD = component diagrams [OK]

Hint: HLD shows diagrams, not code or UI details [OK]

Common Mistakes:

• Including code snippets in HLD
• Confusing HLD with low-level design
• Adding UI mockups in HLD

3. Given a high level design showing components A, B, and C connected in sequence, what is the most likely data flow?

medium

A. Data flows from A to B to C

B. Data flows from C to B to A

C. Data flows randomly between components

D. No data flows between components

Solution

1. Step 1: Analyze component connections

   Sequence connection means data moves in order from first to last component.

2. Step 2: Determine flow direction

   Data flows from A to B to C as per the sequence shown.

3. Final Answer:

   Data flows from A to B to C -> Option A

4. Quick Check:

   Sequence = A -> B -> C data flow [OK]

Hint: Follow arrows in sequence for data flow direction [OK]

Common Mistakes:

• Reversing data flow direction
• Assuming random data flow
• Ignoring component connections

4. A high level design diagram shows a database connected directly to the user interface without any backend service. What is the main issue here?

medium

A. Database should connect only to frontend

B. Too many components included

C. Missing backend layer to handle business logic

D. User interface should connect directly to database

Solution

1. Step 1: Identify missing architectural layer

   Backend services handle logic and security between UI and database.

2. Step 2: Understand why direct UI to database is bad

   Direct connection risks security and breaks separation of concerns.

3. Final Answer:

   Missing backend layer to handle business logic -> Option C

4. Quick Check:

   Backend needed between UI and database [OK]

Hint: UI never connects directly to database [OK]

Common Mistakes:

• Thinking UI can safely connect to database
• Ignoring backend role
• Confusing component count with design quality

5. When creating a high level design for a scalable web application, which of the following should be included?

hard

A. Detailed SQL queries for data retrieval

B. Exact CSS styles for responsive design

C. User passwords and encryption keys

D. Components like load balancers, web servers, and databases with their interactions

Solution

1. Step 1: Identify scalable system components

   Load balancers, web servers, and databases are key parts for scalability.

2. Step 2: Exclude irrelevant details

   CSS styles, SQL queries, and sensitive data are not part of HLD.

3. Final Answer:

   Components like load balancers, web servers, and databases with their interactions -> Option D

4. Quick Check:

   HLD = scalable components + interactions [OK]

Hint: Include scalable components, exclude code and secrets [OK]

Common Mistakes:

• Adding UI styles in HLD
• Including sensitive data in design
• Confusing HLD with implementation details