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Beginner Topic 2 of 51 Distributed Systems & Cloud

Client-Server Model

Clients requesting services from central servers.

How it works

In the client-server model, clients send requests and servers, which provide resources or services, process them and return responses. Servers are typically always on and listen at well-known addresses, while clients initiate communication. Protocols such as HTTP, SQL and gRPC define the exchange, and servers may be stateless, treating each request independently, or stateful, remembering sessions. Multi-tier designs separate presentation, application logic and data into different servers.

Where it is used

Web browsing, email, databases, file shares, online games and mobile apps follow this model, with load balancers and replicas used to scale servers.

Common pitfall

The server is a central point of failure and a bottleneck unless replicated. Many clients can overload it, so use rate limiting, caching and scaling. Stateful servers complicate failover and scaling, so store session state externally. Network failures leave clients unsure whether a request was processed, so make operations idempotent and handle timeouts and retries gracefully.

Where it fits in the course

Client-Server Model is topic 2 of 51 in Distributed Systems & Cloud, rated Beginner. It follows What is a Distributed System. The next topic is Peer-to-Peer Systems.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Distributed Systems & Cloud quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Client-Server Model?
Clients requesting services from central servers. It belongs to Distributed Systems & Cloud and is a beginner-level topic.
Where do people use Client-Server Model?
Web browsing, email, databases, file shares, online games and mobile apps follow this model, with load balancers and replicas used to scale servers.
What is the most common mistake with Client-Server Model?
The server is a central point of failure and a bottleneck unless replicated.
What should I learn before this topic?
Start with What is a Distributed System, the topic just before it in Distributed Systems & Cloud.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Distributed Systems & Cloud quiz.
Is Client-Server Model hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Client-Server Model?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Client-Server Model?
What is a Distributed System, Peer-to-Peer Systems, Scalability are closely connected. The full list is in the related topics section of this page.
What should I study after Client-Server Model?
Continue with Peer-to-Peer Systems, the next topic in Distributed Systems & Cloud.

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