CompTIA A+ 220-902 Question J-29

A user has moved into a building and is installing a new wired network. There is existing cabling throughout the building. The user would like to prevent hardware that they do not own from connecting to the network. Which of the following actions would BEST prevent outside users from connecting?

A. Enable static IPs
B. Disable DNS
C. Disable local proxy server
D. Enable MAC filtering

Correct Answer: D