1. Answer: a Concept: VPN and 802.1x authenticated switches can both be RADIUS clients. To connect to a RADIUS server, a shared secret (sometimes called a Shared Key in the Security+ exam) is required.
2. Answer: b, d, e, f, and g Concept: A natural signature and handwriting are both basically the same. Tap a screen or swiping a card are also something you do. Your gait is how you walk.
3. Answer: d Concept: The attacker has tried different formats of username and password using common standard naming conventions. After this is established, he then tries to guess the password.
4. Answer: f Concept: Authentication between two third parties is federation services, but when the connection method is ...