CML CML Access Control & Electromechanical Systems 2

Question 1

What does 'Wiegand' refer to in access control systems?

Accepted Answer

A communication protocol used between card readers and access control panels

Answer

Wiegand is a widely-used serial data protocol that transmits card data (typically 26-bit format) from a reader to an access control panel.

Question 2

Which type of credential provides the HIGHEST security against cloning attacks in modern access control?

Accepted Answer

13.56 MHz smart cards with mutual authentication (e.g., MIFARE DESFire)

Answer

13.56 MHz smart cards using encrypted mutual authentication are significantly harder to clone than older 125 kHz proximity cards, which can be copied with inexpensive readers.

Question 3

A 'request to exit' (REX) device in an access-controlled door is used to:

Accepted Answer

Signal the access control system that an authorized user is exiting, preventing a door-forced alarm

Answer

A REX device signals the panel that egress is intentional, which suppresses the door-forced alarm that would otherwise trigger when the door opens from the secured side.

Question 4

What is 'tailgating' (also called 'piggybacking') in physical security?

Accepted Answer

An unauthorized person following an authorized person through an access-controlled door without using their own credential

Answer

Tailgating is a social engineering vulnerability where an unauthorized individual gains access by following closely behind a credential holder through a secured door.

Question 5

When a CML installs an electric strike on a hollow metal door frame, which step is critical to prevent premature failure?

Accepted Answer

Ensuring the strike is rated for the door's swing direction (LH, RH, LHR, RHR) and properly mounting with the supplied fasteners

Answer

Installing an electric strike with the wrong handing or using incorrect fasteners can cause misalignment, mechanical failure, and void the product warranty.

(CML) Certified Master Locksmith Practice Test

(CML) Certified Master Locksmith Practice Test

CML CML Access Control & Electromechanical Systems 2