Client-Server and Peer-to-Peer Models
1. Client-Server Model
In this model, distinct roles are assigned. A Central Server provides resources, services, or data, while Clients (workstations) request them.
| Advantages | Disadvantages |
|---|---|
| Centralized Security: All backups and security updates happen on the server. | Single Point of Failure: If the server goes down, the whole network stops. |
| Shared Resources: Users can access files/printers from any client machine. | High Cost: Requires expensive server hardware and specialized OS (e.g., Windows Server). |
Example: A school network where your files are stored on a central file server, or a web server hosting your e-consult.co.ke site.
2. Peer-to-Peer (P2P) Model
In a P2P network, there is no central server. Every computer (peer) has equal status and can act as both a client and a server, sharing its own files and resources.
| Advantages | Disadvantages |
|---|---|
| Easy Setup: No specialized network OS or expensive server needed. | Decentralized Backups: Each user is responsible for their own data. |
| Robust: If one peer fails, the rest of the network remains functional. | Performance: Sharing files can slow down an individual computer for its user. |
Example: A small home Wi-Fi network where computers share a printer, or file-sharing protocols like BitTorrent.
3. Key Differences at a Glance
| Feature | Client-Server | Peer-to-Peer |
|---|---|---|
| Management | Centralized (Network Admin) | Decentralized (User-managed) |
| Security | Strong (controlled at server) | Weak (depends on individual peers) |
| Scalability | Easier to add many clients | Becomes chaotic with many peers |
⚠️ AS-Level Focus: The Thin vs. Thick Client
- Thin Client: A computer with minimal processing power that relies heavily on the server to do the work (e.g., a Chromebook).
- Thick Client: A powerful computer that can process data locally even if disconnected from the server (e.g., your Core-i7 32GB RAM laptop).