Question
Which of the following technologies are X.509 certificates most commonly associated with?
- A. PKI Correct
- B. VLAN tagging
- C. LDAP
- D. MFA
Explanation
X.509 is the standard format for digital certificates used in a public key infrastructure (PKI), where a certificate authority signs certificates that bind a public key to an identity. VLAN tagging is a Layer 2 frame-marking method unrelated to certificates. LDAP can store or serve certificates but is a directory protocol, not the technology certificates belong to. MFA may use certificates as one factor, but X.509 itself is defined for PKI.
