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To defend against an MITM attack, you should use which of the following?
Passwords
VLAN
PKI
Badges
Public key infrastructure can verify the true identity and thwart Man-In-The-Middle (MITM) attacks using mutual authentication.
EDIT: PKI by itself doesn't do anything. Usage of secure channel (SSL/TLS, etc...), which generally need certificates for mutual authentication & confidentiality, can prevent some MIMTM attack (certificate can be obtained with said PKI). Given the actual choices (Badges, VLAN, PKI, Passwords), the best one would be "VLAN". Please reword the question.
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