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Which of the following BEST describes the service that …

A network administrator is looking for a way to automatically update company browsers so they import a list of
root certificates from an online source. This online source will then be responsible for tracking which certificates
are to be trusted or not trusted. Which of the following BEST describes the service that should be implemented
to meet these requirements?

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A.
Trust model

B.
Key escrow

C.
OCSP

D.
PKI

Explanation:
In this scenario we can put a CA in the local network and use an online CA as root CA in a hierarchical trust
model.
A trust Model is collection of rules that informs application on how to decide the legitimacy of a Digital
Certificate.
In a hierarchical trust model, also known as a tree, a root CA at the top provides all of the information. The
intermediate CAs are next in the hierarchy, and they trust only information provided by the root CA. The root CA
also trusts intermediate CAs that are in their level in the hierarchy and none that aren’t. This arrangement
allows a high level of control at all levels of the hierarchical tree.

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