Question

define router, switch, firewall, and host.

Explanation:

A router is a networking device that forwards data packets between computer networks. A switch connects devices within a local - area network (LAN) and forwards data to the intended device. A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A host is a computer or device that has an IP address and can be accessed over a network.

Answer:

Router: A networking device that forwards data packets between networks.
Switch: Connects devices within a LAN and forwards data to the target device.
Firewall: A network - security system controlling network traffic based on security rules.
Host: A computer or device with an IP address accessible over a network.