A computer network is a system of interconnected devices that communicate and share resources. Nodes (devices like computers or servers) are connected by links (physical or wireless connections) to form a network. These connections facilitate the exchange of data and resources, using protocols that define how information is sent and received
Here’s a more detailed look:
1. Nodes and Links:
- Nodes: These are the devices that are part of the network, such as computers, servers, printers, or other network devices. They can send, receive, and process data.
Links:
These are the physical or wireless connections between the nodes. They can be cables, optical fibers, or wireless signals.
2. Data Transmission:
- Packet Switching: Data is broken down into small packets, which are then transmitted across the network.
Routers:
Routers are devices that forward data packets between networks, determining the best route to the destination.
Switches:
Switches connect devices within a single network, allowing them to communicate with each other.
3. Protocols:
- Communication Protocols: These are sets of rules that define how data is formatted, transmitted, and received across the network. Examples include TCP/IP, HTTP, and SMTP.
IP Addresses:
Each device on a network has a unique IP address, which is used to identify it and route data packets to the correct destination.
4. Types of Networks:
- Local Area Network (LAN): A network that covers a small area, like a home or office.
- Wide Area Network (WAN): A network that covers a larger geographical area, like the internet.
5. Key Components:
- Servers: Central computers that provide resources like files, applications, and web pages to other devices on the network.
- Clients: Devices that request resources from the server.
In essence, a network works by connecting devices, enabling them to communicate and share resources using established protocols and physical or wireless connections.