What is MAC spoofing used for?

The correct answer is C, Bypass filters. In wireless network security, access points may use MAC address filtering to allow only devices whose MAC addresses are listed in the access point’s whitelist. CEH wireless-hacking material explains that MAC spoofing can be used to change a wireless adapter’s MAC address so it matches an allowed MAC address in the access point’s whitelist, thereby bypassing the MAC filter. This does not provide encryption, because encryption protects data confidentiality using cryptographic algorithms. It is also not IDS, because an intrusion detection system monitors and alerts on suspicious activity. Logging records events and activities, which is unrelated to changing a MAC address. MAC spoofing is an impersonation technique: the attacker observes or obtains a valid MAC address and configures their own interface to use it. Therefore, in the context of CEH wireless attacks and access control weaknesses, MAC spoofing is primarily used to bypass MAC-based access filters.