CompTIA Security Plus Mock Test Q779

If Organization A trusts Organization B and Organization B trusts Organization C, then Organization A trusts Organization C. Which of the following PKI concepts is this describing?

A. Transitive trust
B. Public key trust
C. Certificate authority trust
D. Domain level trust

Correct Answer: A
Section: Application, Data and Host Security

In transitive trusts, trust between a first party and a third party flows through a second party that is trusted by both the first party and the third party.

Incorrect Answers:
B: Public keys are part of Public Key Infrastructure (PKI) and are used together with private keys in an asymmetrical cryptography system.
C: A Certificate Authority (CA) is responsible for issuing, managing and maintaining certificates in a Public Key Infrastructure (PKI). The certificates are used as a means of
authentication. This, however, is not a trust model.
D: Domains exist within a single organization and represent the trust of entities within the domain. This trust is not extended to third parties.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, pp. 251- 252, 332-333