In a Kerberos environment, apart from the client and the server it wants to access, what other entitites need to be present?

Question

In a Kerberos environment, apart from the client and the server it wants to access, what other  entitites  need to be present?

Accepted Answer

An authentication server (AS) and a ticket-granting server (TGS)

Answer

A certificate authority (CA) and a registration authority (RA)

Answer

The key distribution center (KDC) and the certificate authority (CA)

Answer

A ticket-granting ticket (TGT) and a service-granting ticket (SGT)

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