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What enables users to validate each other's certificate when they are certified under different certification hierarchies?
Correct Answer: A
Explanation/Reference: Explanation: Cross certification allows entities in one public key infrastructure (PKI) to trust entities in another PKI. This mutual trust relationship is typically supported by a cross-certification agreement between the certification authorities (CAs) in each PKI. This agreement determines the responsibilities and liability of each party. A mutual trust relationship between two CAs requires that each CA issue a certificate to the other to establish the relationship in both directions. The path of trust is not hierarchal even though the separate PKIs may be certificate hierarchies. Incorrect Answers: B: Multiple certificates will not allow users to validate each other's certificate when they are certified under different certification hierarchies. C: Redundant certification authorities will not allow users to validate each other's certificate when they are certified under different certification hierarchies. D: A root certification authority is identified by a root certificate, which is an unsigned or a self-signed public key certificate. References: https://msdn.microsoft.com/en-us/library/windows/desktop/bb540800(v=vs.85).aspx https://en.wikipedia.org/wiki/Root_certificate