CISSP All Domains Practice test 14

Kerberos: Authentication protocol that works on the basis of tickets to allow nodes communicating over a non-secure network to prove their identity to each other in a secure manner. It is based on a client–server model and it provides mutual authentication both the user and the server verify each other's identity. Messages are protected against eavesdropping and replay attacks. Builds on symmetric keys and requires a trusted third party, and can optionally use PKI during certain phases of authentication. Uses UDP port 88 by default, used in Active Directory from Windows 2000 and onwards, and many Unix OS’.