A company determines a need for additional protection from rogue devices plugging into physical ports around
the building.
Which of the following provides the highest degree of protection from unauthorized wired network access?

A.
Intrusion Prevention Systems

B.
MAC filtering

C.
Flood guards

D.
802.1x

Explanation:
IEEE 802.1x is an IEEE Standard for Port-based Network Access Control (PNAC). It is part of the IEEE 802.1
group of networking protocols and provides an authentication mechanism to wireless devices connecting to a
LAN or WLAN.