Client-server and peer-to-peer (P2P) networks differ in how devices share resources and responsibilities. In a client-server network, clients request services from a central server; in a peer-to-peer network, each connected device can act as both a client and a server.
The mechanism
In a client-server model, a dedicated server stores data, manages access, or provides services. A client, such as a laptop or phone, sends a request, and the server processes it and returns a response. This creates centralized control, making it easier to apply security rules, back up data, and manage users. However, the server can become a bottleneck or single point of failure.
In a P2P model, devices called peers communicate directly and share resources. A peer may download part of a file from several other peers while also uploading parts to them. This distributes processing and storage, so the network can continue operating even if one peer disconnects. However, management, security, and data availability may be less consistent.
| Client-server network | Peer-to-peer network |
|---|---|
| A central server provides services to clients. | Each peer can provide and request services. |
| Control, security, and backups are easier to coordinate. | Control and responsibility are distributed. |
| Server failure can affect many users. | Failure of one peer usually has a smaller effect. |
| Common in schools, businesses, websites, and cloud services. | Common in direct file sharing and some decentralized systems. |
A common misconception is that P2P networks have no servers at all. Some P2P systems use supporting servers for coordination, authentication, or locating peers, even though the main exchange occurs directly between peers. Also, the internet is the global network infrastructure, while the world wide web is one service that operates over it.
For an IB Digital Society Distinguish question, define both models, compare the direction of communication and control, then explain one advantage and one limitation of each. This topic is shared by SL and HL under networks and the internet.
