CompTIA Network+ (N10-007) — Question 356

An office network consists of one two-port router connected to a 12-port switch. A four-port hub is also connected to the switch. On this particular network, which of the following is the number of collision domains that exist?

Answer options

• A. 3
• B. 12
• C. 13
• D. 14
• E. 15

Correct answer: C

Explanation

In this network setup, each port on the switch and the router creates a separate collision domain. The router provides one collision domain, the 12 ports on the switch create 12 collision domains, and the four ports of the hub only add one collision domain due to their shared nature. Therefore, the total number of collision domains is 1 (router) + 12 (switch) + 1 (hub) = 13, making C the correct answer.