Basics of Computer Networking (original) (raw)

Last Updated : 28 Apr, 2026

Computer network is a collection of interconnected devices that communicate with each other to exchange data and resources. It enables efficient communication and supports services like email, file sharing, and internet access.

• Nodes are physical devices such as computers, mobiles, or printers.
• Routers and switches control the flow of information.
• Transmission media carry data from one device to another.
• Wired media includes Ethernet and optical fiber cables.

Basic of Computer Networks

Working

Computer network operates by enabling devices to communicate and exchange data using a shared communication system. Each device in the network follows predefined rules to ensure that data is transmitted accurately, efficiently, and securely.

Working Structure

• A network consists of nodes such as computers, servers, routers, and switches that send or receive data.
• These nodes are connected through links, which may be wired (cables, optical fiber) or wireless (Wi-Fi, radio signals).
• When data is sent, it is broken into small packets and transmitted across the network.
• Protocols define how data packets are formatted, transmitted, received, and acknowledged.
• Each device is identified by a unique IP address, which ensures data reaches the correct destination.
• Network devices like switches and routers forward data packets along the best available path.
• Security mechanisms, such as firewalls, monitor traffic and allow or block data based on security rules.

Types of Computer Network Architecture

Computer Network falls under these broad Categories:

• **Client-Server Architecture: Represents a type of computer network architecture in which nodes function as servers or clients, where the server manages client behavior, known as Client-Server Architecture.
• **Peer-to-Peer Architecture: Operates without any central server, allowing each device to act as either a client or a server, known as P2P (Peer-to-Peer) Architecture.

Network Devices

These are physical devices that connect computers, printers and other electronic equipment to a network and enable data sharing, transferring and managing.

1. Router

Functions as a networking device that connects multiple networks and directs data between them.

• Connects local networks to the internet
• Determines the best path for data packets
• Uses IP addresses to forward data correctly

2. Switch

Connects devices within the same network and manages internal data communication.

• Connects computers, printers, and servers
• Sends data only to the intended device
• Improves network efficiency and performance

3. Hub

Acts as a basic device that connects multiple devices within a network.

• Broadcasts data to all connected devices
• Does not filter or manage traffic
• Less secure and less efficient than a switch

4. Bridge

Connects two network segments and filters traffic between them.

• Reduces unnecessary data transmission
• Improves network performance
• Works using MAC addresses

5. Gateway

Connects two different networks that use different protocols.

• Translates data between different systems
• Enables communication between dissimilar networks
• Commonly used to connect private networks to external networks

6. Access Point (AP)

Provides wireless connectivity to devices in a network.

• Extends a wired network into Wi-Fi
• Allows mobile devices to connect wirelessly
• Improves network coverage area

7. Modem

Converts digital data into signals suitable for transmission and vice versa.

• Connects a home or office network to the ISP
• Converts digital signals to analog and back
• Enables internet access

8. Firewall

Security device that monitors and controls network traffic.

• Blocks unauthorized access
• Filters incoming and outgoing data
• Protects networks from cyber threats

Goals and Uses

• **Resource Sharing: Allow multiple users to share hardware, software, and data resources efficiently.
• **Internet and Cloud Access: Enable access to the Internet, online services, and cloud-based applications.
• **Cost Efficiency: Reduce operational and infrastructure costs through shared resources and centralized systems.
• **Reliability and Availability: Improve system reliability using backup paths and fault-tolerant mechanisms.
• **Scalability and Growth: Support easy expansion by adding new devices and services as demand increases.
• **Security and Control: Protect data and network resources using authentication, access control, and monitoring.