Which of the following should a technician implement to prevent external contractors from
physically plugging devices into the company’s network jacks unless such jacks are designated for
guest use?

A.
Disable DHCP and assign a static IP address to each network device physically connected to
the network.

B.
Enable MAC address filtering across all network jacks and record the MAC address of guest
devices.

C.
Disable all switch ports when they are not utilized and enable them on an as needed basis.

D.
Place guest network jacks in public areas and all other jacks in secure areas as needed.

Explanation:

The best way is to disable all switch ports when they are not utilized. Switch them on when you
need them. This way, you can prevent external contractors from physically plugging devices in to
company’s network jacks.