Which of the following is NOT part of the Kerberos authentication protocol?

Which of the following is NOT part of the Kerberos authentication protocol?
A .  Symmetric key cryptography
B .  Authentication service (AS)
C .  Principals
D .  Public Key

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Answer: D

Explanation: There is no such component within kerberos environment. Kerberos uses only symmetric encryption and does not make use of any public key component.

The other answers are incorrect because :

Symmetric key cryptography is a part of Kerberos as the KDC holds all the users’ and services’ secret keys. Authentication service (AS) : KDC (Key Distribution Center) provides an authentication service

Principals : Key Distribution Center provides services to principals , which can be users , applications or network services. References: Shon Harris , AIO v3 , Chapter – 4: Access Control , Pages : 152-155.