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MAC address spoofing is an attack on:
Integrity
Availability
Confidentiality
Authentication
All of the above, depending on the intended use of the spoofed MAC Address.
It is an attack on authentication, since it allows an unauthorized device to connect to the network when 'MAC filtering' is in place.
Edit: the correct answer could be confidentiality if the attacker uses a spoofed MAC to get data not intended for them, it could be availability if the spoofed MAC is used to deny another device access to the network.
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