40082332
Description
Quiz by Eladio Rocha, updated 11 months ago
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Created by Eladio Rocha
about 1 year ago
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Question 1
Question
What is the role of DNS in the request flow to a web application?
Answer
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Routes HTTP requests to the load balancer.
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Provides the IP address of the requested domain.
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Caches static content for faster delivery.
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Directly manages connections between users and servers.
Question 2
Question
Why is JSON a commonly used API response format for mobile applications?
Answer
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It supports relational joins.
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It requires less storage space than XML.
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It is simple and easy to parse.
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It is compatible with relational databases by default.
Question 3
Question
What is a primary disadvantage of vertical scaling for databases?
Answer
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It does not improve database redundancy.
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It requires splitting data into multiple shards.
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It increases latency for read operations.
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It prevents adding more memory to the server.
Question 4
Question
In the context of sharding, what is the function of a sharding key?
Answer
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It defines relationships between tables in a database.
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It determines how data is distributed across shards.
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It improves the cache hit ratio for frequently accessed data.
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It ensures low latency for all database queries.
Question 5
Question
How does a load balancer improve system reliability?
Answer
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By storing session data for web servers.
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By caching database queries for faster responses.
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By routing traffic to available servers when one fails.
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By replacing offline servers with new hardware.
Question 6
Question
Which caching strategy is most suitable for frequently accessed data that changes rarely?
Answer
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Write-through cache.
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Read-through cache.
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Write-behind cache.
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Cache-first strategy.
Question 7
Question
What is the primary advantage of a stateless web tier?
Answer
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It reduces the need for load balancers.
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It simplifies scaling and improves fault tolerance.
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It allows servers to store session data locally.
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It requires fewer web servers to handle traffic.
Question 8
Question
What challenge does a stateful architecture introduce when scaling horizontally?
Answer
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Increased dependency on CDN services.
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All user requests must be routed to the same server.
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Difficulty in maintaining database consistency.
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Inefficiency in handling write-heavy traffic.
Question 9
Question
What is the purpose of geoDNS in a multi-data center setup?
Answer
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To replicate data across different regions.
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To cache data closer to the user.
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To route traffic to the nearest data center.
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To load balance traffic between multiple servers.
Question 10
Question
What is a critical challenge in implementing a multi-data center setup?
Answer
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Managing server-side caching policies.
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Synchronizing data across data centers.
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Adding redundancy to the load balancer.
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Handling high write-to-read traffic ratios.
Question 11
Question
What is the primary function of a message queue in system design?
Answer
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To handle join operations in sharded databases.
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To distribute and decouple asynchronous tasks.
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To maintain consistency across data centers.
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To balance traffic between database shards.
Question 12
Question
How does sharding improve database scalability?
Answer
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By adding redundancy to the data tier.
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By distributing data across multiple servers.
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By reducing the number of write operations.
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By enabling dynamic joins across databases.
Question 13
Question
What is a common approach to mitigating the “celebrity problem” in sharded databases?
Answer
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Increasing the CPU capacity of affected shards.
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Allocating specific shards to high-traffic users.
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Using vertical scaling to handle additional load.
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Implementing sticky sessions at the web tier.
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