What method helps mitigate the threat of IP spoofing?

A.
Access control

B.
Logging

C.
SNMP polling

D.
Layer 2 switching

Explanation:
The most common method for preventing IP spoofing is to properly configure access control. To reduce the effectiveness of IP spoofing, configure access control to deny any traffic from the external network that has a source address that should reside on the internal network.
REF;Safe white papers;page 67
SAFE: Extending the Security Blueprint to Small, Midsize, and Remote-User Networks