CompTIA Security+ Question E-66

Which of the following types of trust models is used by a PKI?

A. Transitive
B. Open source
C. Decentralized
D. Centralized

Answer: D

Explanation:
PKI uses a centralized trust model. In a simple PKI a single centralized certification authority (CA). In a hierarchical trust model the root CA is the center of the model, with subordinate CAs lower in the hierarchy. Note: A public key infrastructure (PKI) is a set of hardware, software, people, policies, and

procedures needed to create, manage, distribute, use, store, and revoke digital certificates. A trust Model is collection of rules that informs application on how to decide the legitimacy of a Digital Certificate.

CompTIA A+ 220-902 Question I-64

Which of the following is a difference between Android and iOS operating systems?

A. Screen sizes are larger in iOS devices
B. iOS is an open source operating system
C. Android does not have NFC technology
D. Android allows the use of various application sources

Correct Answer: D

CompTIA A+ 220-902 Question D-4

Which of the following is one of the key differences between iOS smartphones and Android- based smartphones?

A. Android phones cannot adjust Bluetooth visibility timeouts
B. iOS phones have to install apps from a PC
C. Android has an open source application store
D. iOS phones cannot use “Airplane Mode”

Correct Answer: C

CompTIA A+ Question H-54

Android smartphones are typically different from other smartphone devices in that:

A. Android devices use apps that are more secure than other devices.
B. Android devices use open source operating systems.
C. Android devices can only operate with a proprietary operating system.
D. Android devices can receive apps from different sources.

Correct Answer: B