The Network Layer (Layer 3) is responsible for determining the best path for data to travel from the source to the destination across different networks.
The Transport Layer (Layer 4) ensures reliable data transfer between end systems by handling error checking, data flow control, and re-transmission of lost packets.
A network allows multiple devices to communicate and share resources such as files, printers, and internet connections.
A Local Area Network (LAN) is a network that connects devices within a limited geographic area, such as a home, office, or building.
A switch operates at the Data Link Layer (Layer 2) and is used to connect devices within the same network, forwarding data to the correct device based on MAC addresses.