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The Kerberos protocol is composed of three subprotocols.
| Subprotocol | Meaning |
|---|---|
| Authentication Service Exchange |
In this subprotocol, the Key Distribution Center (KDC) gives the client a logon session key and a ticket-granting ticket (TGT). |
| Ticket-Granting Service Exchange |
In this subprotocol, the KDC distributes a service session key and a ticket for the service. |
| Client/Server Exchange |
In this subprotocol, the client presents the ticket for admission to a service. |