Client-Server vs Peer-to-Peer Networks Compared

Client-server networks offer:

• Centralised data storage
• Easier backups
• Strong access control
• Better security management
• Consistent performance

These advantages make client-server networks suitable for medium to large organisations.

Disadvantages of Client-Server Networks

However, they also have limitations:

• Higher setup and maintenance cost
• Requires skilled administration
• Server failure can disrupt the entire network

In IB exams, this is often described as a single point of failure.

What Is a Peer-to-Peer Network?

In a peer-to-peer (P2P) network, all devices have equal roles.

Each device:

• Can request data
• Can provide data

There is no central server. Devices communicate directly with each other.

How Peer-to-Peer Networks Work

In a P2P network:

• Devices share files directly
• Resources are distributed
• Each peer manages its own data

This model is commonly used in:

• Small home networks
• Temporary networks
• File-sharing systems

Advantages of Peer-to-Peer Networks

Peer-to-peer networks offer:

• Low cost
• Simple setup
• No dedicated server required
• No single point of failure

They are ideal for small-scale or informal networks.

Disadvantages of Peer-to-Peer Networks

However, they also have drawbacks:

• Weak security
• No central control
• Difficult to manage as the network grows
• Data inconsistency

As the number of devices increases, performance and organisation can degrade.

Comparing Client-Server and Peer-to-Peer Networks

Strong IB answers compare the models clearly:

• Client-server
  • Centralised control
  • Better security
  • Higher cost
• Peer-to-peer
  • Decentralised
  • Lower cost
  • Limited scalability

The key difference is control and responsibility.

How This Appears in IB Exams

Students may be asked to:

• Compare the two models
• Choose a suitable model for a scenario
• Justify network design decisions
• Discuss security and scalability

Justification is more important than memorisation.

Common Student Mistakes

Students often:

• Say peer-to-peer networks have servers
• Ignore scalability issues
• Forget security implications
• Give one-sided comparisons

Balanced explanations score higher.

Final Thoughts

Client-server and peer-to-peer networks represent two very different ways of organising network communication. Client-server networks prioritise control, security, and scalability, while peer-to-peer networks prioritise simplicity and cost.

Understanding when and why each model is used allows IB Computer Science students to analyse real-world networks accurately and confidently.

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