In a network with 25 computers, which topology would require the most extensive cabling?

Correct answer: Mesh. In a full mesh every computer connects to every other, which requires n(n − 1)/2 = 300 links for 25 computers.

• Star: A star needs one link per computer (25) to a central hub.
• Bus: A bus uses one shared backbone cable.
• Ring: A ring needs about one link per computer (25).