Understanding the basics of computer networking
A network is a group of devices connected together to share data, resources, and services.
Networking enables communication, centralized control, security, and scalability.
Networking devices are hardware components used to connect, manage, and control data flow between devices in a network. Each device has a specific role in network communication.
A Network Interface Card (NIC) allows a device to connect to a network. It can be wired (Ethernet) or wireless (Wi-Fi). Each NIC has a unique MAC address used for identification at Layer 2.
A hub is a basic networking device that connects multiple computers in a LAN. It operates at the Physical Layer (Layer 1) and broadcasts data to all ports, which makes it inefficient and insecure.
A switch is a Layer 2 device that forwards data using MAC addresses. Unlike hubs, switches send data only to the intended destination, improving performance and security.
A router operates at the Network Layer (Layer 3) and is used to connect different networks together. It forwards packets based on IP addresses and is commonly used to connect local networks to the internet.
An Access Point allows wireless devices to connect to a wired network. It acts as a bridge between wireless clients and the LAN.
A modem converts digital data from a computer into signals suitable for transmission over ISP lines and vice versa. It is commonly used for internet connectivity.
A firewall is a security device that monitors and controls incoming and outgoing network traffic based on predefined security rules. Firewalls can be hardware-based or software-based.
A gateway connects networks using different protocols. It acts as an entry and exit point between different network environments.
A repeater is used to regenerate and amplify signals to extend the distance of network communication.
A bridge connects two LAN segments and filters traffic based on MAC addresses. It helps reduce collisions and improve network performance.