Client / Server Network

A client/server network is a network in which one or more computers or devices (clients) request data or services from a central computer (server). The server receives these requests and provides the required data or services.

This network model is commonly used to share files, applications, printers, and other resources among multiple users.

What Is a Client?

A client is a computer or other device that requests data or services from a server.

A client may be a desktop computer, laptop, tablet, or mobile phone. When a user opens a website, accesses a shared file, or uses an application that depends on a server, the client sends a request to the server.

Main characteristics of a client

Requests data, information, or services from a server.
Sends requests through a network.
Receives and uses the response provided by the server.
Can be a desktop computer, laptop, tablet, or mobile phone.

What Is a Server?

A server is a computer that provides data, information, or services to client devices over a network.

A server receives client requests, processes them, and sends back the requested data or service. Depending on its role, a server may store files, manage user accounts, control access to resources, or run applications.

Main characteristics of a server

Receives and processes requests from clients.
Provides data, information, or services to clients.
Can store and share files and manage users.
Can help control security and access to shared network resources.
Can serve multiple clients over the network.

How a Client/Server Network Works

Communication between a client and a server generally follows a request-and-response process.

The client sends a request. A user performs an action, such as opening a web page or requesting a shared file. The client sends a request to the server.
The server receives the request. The server examines the request and identifies the required data or service.
The server processes the request. It locates or creates the required information, subject to its configuration and access permissions.
The server sends a response. The server returns the requested data or a result to the client.
The client receives the response. The client displays or uses the information.

Example: Opening a Web Page

When a student enters a website address in a web browser, the computer or phone acts as the client. It sends a request to the web server that hosts the website. The server responds with the information needed to display the page, and the browser presents it to the student.

Network Operating System (NOS)

A Network Operating System (NOS) is software used to manage a network and its shared resources. In a client/server network, server operating system software can provide services such as user management, file sharing, access control, and network resource management.

A NOS can help an administrator:

create and manage user accounts;
control which users can access particular files or services;
manage shared resources, such as files and printers; and
apply security settings to the network.

Examples of server operating systems include Windows Server and Linux server distributions, such as Ubuntu Server.

Examples of Client/Server Networks

Example: School Computer Network

A school may use a server to store learning materials and shared files. Students and teachers use client computers to request those resources. The server can manage access so that users receive the files or services they are permitted to use.

Example: Office Network

In an office, several employees may use their computers to access files stored on a central file server. Instead of keeping separate copies on every computer, employees can access shared files from the server, depending on their permissions.

Example: Website Access

A web browser on a computer or mobile phone acts as a client. The web server receives the browser's request and sends back the web page data.

Advantages of a Client/Server Network

Centralized management: User accounts, shared files, and some security settings can be managed centrally.
Resource sharing: Multiple clients can access shared resources, such as files, applications, or printers.
Access control: The server can restrict access to resources based on user permissions.
Centralized data storage: Data stored on a server can be managed and backed up in one central location.

Limitations of a Client/Server Network

Dependence on the server: If an essential server becomes unavailable, clients may lose access to the services or resources it provides.
Cost: A dedicated server and its maintenance may require additional hardware, software, and administration.
Administration: The network needs suitable configuration, maintenance, and security management.
Network dependence: Clients generally need a working network connection to access server-based resources.

Client vs Server

Client	Server
Requests data or services.	Provides data or services.
Sends requests to a server.	Receives and processes client requests.
Uses the response received.	Sends a response to the client.
Examples include computers, laptops, tablets, and phones.	Often a computer configured to provide network services.

Exam-Focused Points

Key Idea: A client requests data or services, while a server provides them.

Key Idea: A client/server network can allow many clients to access shared resources provided by a server.

Key Idea: A Network Operating System helps manage users, devices, security, and shared network resources.

For questions about the communication process, remember the order: request from the client → processing by the server → response from the server → use by the client.

Summary

A client/server network uses client devices to request data or services from a server. The server processes requests and provides responses or shared resources. A Network Operating System can help manage users, security, and network resources. This model supports centralized management and sharing, but clients may depend on the availability of the server and the network.

Client/ Server Network

📌 The Short Note

📖 Explanation