A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on pre-defined security rules. It acts as a barrier between a private network and the public internet, preventing unauthorized access and protecting data from malicious attacks.

Server

A server is a computer that provides resources and services to other computers on a network. It can be used to store and share files, provide email services, host websites, and run applications.

Switch

A switch is a network device that connects multiple network devices together. It forwards traffic between devices based on their MAC addresses. This allows devices on the same switch to communicate directly with each other, without having to go through the switch's CPU.

A hub is a network device that connects multiple network devices together, similar to a switch. However, unlike a switch, a hub broadcasts all traffic to all connected devices, regardless of the destination address. This can cause congestion on the network and can make it more difficult to secure data.

Ethernet cable

An Ethernet cable is a physical cable used to connect devices to a network. It consists of four pairs of twisted copper wires that are shielded to reduce interference. Ethernet cables are available in different lengths and speeds, and they are the most common type of cable used for wired networks.

Host

A host is any device that is connected to a network. This includes computers, servers, printers, routers, and other devices.