CompTIA Network+

Answer: D - If you want to separate every host on your network such that each of them has its own collision domain, use a switch.

Key Takeaway: A collision domain is one of the logical network segments in which the data packets can collide into each other. Collisions occur when multiple devices are trying to transmit packets at the same time. More collisions in a network result in lesser efficiency of the network. Switches should be used to reduce collisions on a network. Every port on a switch represents a collision domain. Each collision domain is made up of only one system. Without multiple systems in a collision domain, collisions cannot occur.