Practice the English vocabulary and sentence structures for narrating system design during interviews.
0 / 25 completed
1 / 25
An interviewer asks you to design a URL shortener. What is a good opening sentence?
Good system design interviews begin with requirement clarification — scale, access patterns, and constraints before jumping to implementation.
2 / 25
You are explaining a caching layer in your design. Which sentence is most technically precise?
Precise system design language names the technology, its position in the architecture, and the problem it solves.
3 / 25
How would you describe a trade-off between consistency and availability in your design?
The CAP theorem trade-off must be articulated explicitly: what is sacrificed and what is gained for the specific use case.
4 / 25
You need to explain database sharding in your design. Which sentence is best?
Sharding explanations should specify the sharding key, the partitioning strategy, and the scaling problem being solved.
5 / 25
The interviewer asks: How would you handle 10x the current load? What is the best response?
Scaling responses should address each bottleneck tier: application, database, and caching — with specific patterns for each.
6 / 25
During a code review of a new microservice API endpoint, your teammate describes it as 'stateless and horizontally scalable.' You want to ensure you understand their intent fully. What's the most effective way to probe for clarification in this context? Specifically, what aspects are they prioritizing?
Option B is best because it directly challenges the teammate's use of 'stateless,' prompting a deeper discussion about their understanding of session management and its implications. Options A and D focus on misunderstandings or tangential concerns. Option C is too broad; while relevant, it doesn't specifically address the core term being discussed.
7 / 25
During a code review of a new API endpoint designed to handle high volumes of requests, your senior engineer says, 'This needs to be highly available.' You want to ensure you fully understand the implications. Which response best demonstrates your understanding and prompts further discussion about specific strategies?
The correct answer (option 2) acknowledges the importance of high availability while prompting a crucial clarification. It avoids assuming a specific implementation and directly asks for an explanation. Options A and B are too vague or don't actively seek understanding; option D focuses on a superficial monitoring aspect without addressing the core concern of resilience and fault tolerance, which 'high availability' inherently implies.
8 / 25
During a design discussion for a new recommendation engine API, your team lead says, 'We need to ensure low latency for user requests.' You want to delve deeper into the specific technical choices being considered. Which of the following responses best demonstrates you're actively seeking more detail about their approach?
Option 1 directly acknowledges the importance of low latency while requesting further clarification on the *methods* being considered. Options A and C demonstrate a passive acceptance without probing for specifics, while option B suggests a premature commitment to PostgreSQL which isn't necessarily relevant to the question of latency strategies.
9 / 25
You're reviewing a PR for a new rate limiter. The developer states, 'We've implemented a token bucket algorithm to handle bursts.' You want to ensure you fully grasp the implications of this choice. Which response best demonstrates your understanding and prompts further discussion about potential considerations?
Option 1 is best because it directly probes for key details – bucket size and refill rate – which are crucial parameters of a token bucket algorithm. Options B and C simply acknowledge the technique without asking critical follow-up questions. Option D introduces an unrelated technology (Redis) that isn't central to understanding the core design choice.
10 / 25
You're reviewing a pull request for a new API endpoint that processes user profile updates. Your teammate writes in the PR description: 'This service will use optimistic locking to prevent concurrent updates.' During the review, you want to ensure everyone's on the same page about this approach.
The key here is to probe beyond a surface-level understanding. While 'optimistic locking sounds like a good way to avoid race conditions' is true in principle, it doesn't demonstrate an active attempt to understand the implementation details. Option B – asking about *how* it's implemented – pushes for clarification and ensures you grasp the practical mechanics of optimistic locking (e.g., rollbacks). Options A and C are accepting the statement without critical assessment, while option D introduces a potentially incorrect suggestion.
11 / 25
During a code review of a new microservice API endpoint, your teammate describes it as 'stateless and horizontally scalable.' You want to ensure you understand their intent fully. What's the most effective way to probe for clarification in this context? Specifically, what aspects are they prioritizing?
Option B is best because it directly challenges the teammate's use of 'stateless,' prompting a deeper discussion about their understanding of session management and its implications. Options A and D focus on misunderstandings or tangential concerns. Option C is too broad; while relevant, it doesn't specifically address the core term being discussed.
12 / 25
During a code review of a new API endpoint designed to handle high volumes of requests, your senior engineer says, 'This needs to be highly available.' You want to ensure you fully understand the implications. Which response best demonstrates your understanding and prompts further discussion about specific strategies?
The correct answer (option 2) acknowledges the importance of high availability while prompting a crucial clarification. It avoids assuming a specific implementation and directly asks for an explanation. Options A and B are too vague or don't actively seek understanding; option D focuses on a superficial monitoring aspect without addressing the core concern of resilience and fault tolerance, which 'high availability' inherently implies.
13 / 25
During a design discussion for a new recommendation engine API, your team lead says, 'We need to ensure low latency for user requests.' You want to delve deeper into the specific technical choices being considered. Which of the following responses best demonstrates you're actively seeking more detail about their approach?
Option 1 directly acknowledges the importance of low latency while requesting further clarification on the *methods* being considered. Options A and C demonstrate a passive acceptance without probing for specifics, while option B suggests a premature commitment to PostgreSQL which isn't necessarily relevant to the question of latency strategies.
14 / 25
You're reviewing a PR for a new rate limiter. The developer states, 'We've implemented a token bucket algorithm to handle bursts.' You want to ensure you fully grasp the implications of this choice. Which response best demonstrates your understanding and prompts further discussion about potential considerations?
Option 1 is best because it directly probes for key details – bucket size and refill rate – which are crucial parameters of a token bucket algorithm. Options B and C simply acknowledge the technique without asking critical follow-up questions. Option D introduces an unrelated technology (Redis) that isn't central to understanding the core design choice.
15 / 25
You're reviewing a pull request for a new API endpoint that processes user profile updates. Your teammate writes in the PR description: 'This service will use optimistic locking to prevent concurrent updates.' During the review, you want to ensure everyone's on the same page about this approach.
The key here is to probe beyond a surface-level understanding. While 'optimistic locking sounds like a good way to avoid race conditions' is true in principle, it doesn't demonstrate an active attempt to understand the implementation details. Option B – asking about *how* it's implemented – pushes for clarification and ensures you grasp the practical mechanics of optimistic locking (e.g., rollbacks). Options A and C are accepting the statement without critical assessment, while option D introduces a potentially incorrect suggestion.
16 / 25
During a code review of a new microservice API endpoint, your teammate describes it as 'stateless and horizontally scalable.' You want to ensure you understand their intent fully. What's the most effective way to probe for clarification in this context? Specifically, what aspects are they prioritizing?
Option B is best because it directly challenges the teammate's use of 'stateless,' prompting a deeper discussion about their understanding of session management and its implications. Options A and D focus on misunderstandings or tangential concerns. Option C is too broad; while relevant, it doesn't specifically address the core term being discussed.
17 / 25
During a code review of a new API endpoint designed to handle high volumes of requests, your senior engineer says, 'This needs to be highly available.' You want to ensure you fully understand the implications. Which response best demonstrates your understanding and prompts further discussion about specific strategies?
The correct answer (option 2) acknowledges the importance of high availability while prompting a crucial clarification. It avoids assuming a specific implementation and directly asks for an explanation. Options A and B are too vague or don't actively seek understanding; option D focuses on a superficial monitoring aspect without addressing the core concern of resilience and fault tolerance, which 'high availability' inherently implies.
18 / 25
During a design discussion for a new recommendation engine API, your team lead says, 'We need to ensure low latency for user requests.' You want to delve deeper into the specific technical choices being considered. Which of the following responses best demonstrates you're actively seeking more detail about their approach?
Option 1 directly acknowledges the importance of low latency while requesting further clarification on the *methods* being considered. Options A and C demonstrate a passive acceptance without probing for specifics, while option B suggests a premature commitment to PostgreSQL which isn't necessarily relevant to the question of latency strategies.
19 / 25
You're reviewing a PR for a new rate limiter. The developer states, 'We've implemented a token bucket algorithm to handle bursts.' You want to ensure you fully grasp the implications of this choice. Which response best demonstrates your understanding and prompts further discussion about potential considerations?
Option 1 is best because it directly probes for key details – bucket size and refill rate – which are crucial parameters of a token bucket algorithm. Options B and C simply acknowledge the technique without asking critical follow-up questions. Option D introduces an unrelated technology (Redis) that isn't central to understanding the core design choice.
20 / 25
You're reviewing a pull request for a new API endpoint that processes user profile updates. Your teammate writes in the PR description: 'This service will use optimistic locking to prevent concurrent updates.' During the review, you want to ensure everyone's on the same page about this approach.
The key here is to probe beyond a surface-level understanding. While 'optimistic locking sounds like a good way to avoid race conditions' is true in principle, it doesn't demonstrate an active attempt to understand the implementation details. Option B – asking about *how* it's implemented – pushes for clarification and ensures you grasp the practical mechanics of optimistic locking (e.g., rollbacks). Options A and C are accepting the statement without critical assessment, while option D introduces a potentially incorrect suggestion.
21 / 25
During a code review of a new microservice API endpoint, your teammate describes it as 'stateless and horizontally scalable.' You want to ensure you understand their intent fully. What's the most effective way to probe for clarification in this context? Specifically, what aspects are they prioritizing?
Option B is best because it directly challenges the teammate's use of 'stateless,' prompting a deeper discussion about their understanding of session management and its implications. Options A and D focus on misunderstandings or tangential concerns. Option C is too broad; while relevant, it doesn't specifically address the core term being discussed.
22 / 25
During a code review of a new API endpoint designed to handle high volumes of requests, your senior engineer says, 'This needs to be highly available.' You want to ensure you fully understand the implications. Which response best demonstrates your understanding and prompts further discussion about specific strategies?
The correct answer (option 2) acknowledges the importance of high availability while prompting a crucial clarification. It avoids assuming a specific implementation and directly asks for an explanation. Options A and B are too vague or don't actively seek understanding; option D focuses on a superficial monitoring aspect without addressing the core concern of resilience and fault tolerance, which 'high availability' inherently implies.
23 / 25
During a design discussion for a new recommendation engine API, your team lead says, 'We need to ensure low latency for user requests.' You want to delve deeper into the specific technical choices being considered. Which of the following responses best demonstrates you're actively seeking more detail about their approach?
Option 1 directly acknowledges the importance of low latency while requesting further clarification on the *methods* being considered. Options A and C demonstrate a passive acceptance without probing for specifics, while option B suggests a premature commitment to PostgreSQL which isn't necessarily relevant to the question of latency strategies.
24 / 25
You're reviewing a PR for a new rate limiter. The developer states, 'We've implemented a token bucket algorithm to handle bursts.' You want to ensure you fully grasp the implications of this choice. Which response best demonstrates your understanding and prompts further discussion about potential considerations?
Option 1 is best because it directly probes for key details – bucket size and refill rate – which are crucial parameters of a token bucket algorithm. Options B and C simply acknowledge the technique without asking critical follow-up questions. Option D introduces an unrelated technology (Redis) that isn't central to understanding the core design choice.
25 / 25
You're reviewing a pull request for a new API endpoint that processes user profile updates. Your teammate writes in the PR description: 'This service will use optimistic locking to prevent concurrent updates.' During the review, you want to ensure everyone's on the same page about this approach.
The key here is to probe beyond a surface-level understanding. While 'optimistic locking sounds like a good way to avoid race conditions' is true in principle, it doesn't demonstrate an active attempt to understand the implementation details. Option B – asking about *how* it's implemented – pushes for clarification and ensures you grasp the practical mechanics of optimistic locking (e.g., rollbacks). Options A and C are accepting the statement without critical assessment, while option D introduces a potentially incorrect suggestion.
What will I practice in "System Design Interview Narration"?
This is an Architecture Diagrams exercise set. It walks through 25 scenario-based multiple-choice questions built around real usage of Architecture Diagrams terminology that IT professionals encounter on the job.
Is this exercise free to use?
Yes. Every exercise on CoderSlingo, including this one, is free to complete with no account, sign-up, or paywall.
How many questions are in this exercise?
This set contains 25 questions. Each one shows immediate feedback and a detailed explanation after you answer, so you learn the correct usage right away rather than waiting for a final score.
Do I need prior experience to complete this exercise?
No prior experience is required. Each question includes a full explanation covering the reasoning behind the correct answer, so the exercise itself teaches the Architecture Diagrams vocabulary as you go.
Can I retry the exercise if I get questions wrong?
Yes — use the "Try again" button on the results screen to reset your answers and go through all the questions again. There is no limit on attempts.
Is my progress saved?
Your answers and score for the current session are tracked in the browser as you go. No account or login is needed, and there is nothing to install.
What if I don't understand a term used in a question?
Read the explanation shown after you answer each question — it breaks down the correct term in plain English with a real-world example. You can also check the site Glossary for quick definitions.
How is this different from reading a blog article on the topic?
Exercises like this one are interactive drills that test and reinforce specific vocabulary through multiple-choice questions, while blog articles explain concepts in prose. Practising here after reading builds active recall, not just passive recognition.
Where can I find more Architecture Diagrams exercises?
See the Architecture Diagrams exercises hub for the full set of related pages, or browse all exercise categories from the main Exercises index.
Can I use this exercise to prepare for a technical interview?
Yes — Architecture Diagrams vocabulary comes up often in technical discussions and interviews. Pair this exercise with our dedicated Interview Preparation section for role-specific practice.