A. Defense against flood attacks can be used to defend against Ping of Death attacks.

B. Attack defense allows APs to analyze the contents and behaviors of incoming packets on ports to determine whether packets have attack characteristics. The APs then take defense measures on the packets that have attack characteristics.

C. Attack defense can defend against spoofing packet attacks, malformed packet attacks, fragmentation attacks, and flood attacks.

D. Fragmentation attack defense enables a device to detect packet fragments in real time and discard or rate-limit them to protect the device.