CompTIA Network+ N10-006 Q481

Given the following system requirements:
Automatically assigns IP addresses
Only authorized workstations can be connected
Notify the network administrator of potentially malicious activity
Which of the following must be implemented to satisfy these conditions? (Select three.)

A. DNS
B. Content filtering
C. MAC filtering
D. NIDS
E. VPN
F. RADIUS
G. DHCP server
H. URL cache
I. Load balancer

Correct Answer: CDG

Explanation/Reference:
https://en.wikipedia.org/wiki/MAC_filtering
https://en.wikipedia.org/wiki/Intrusion_detection_system
http://whatismyipaddress.com/dhcp