Final answer:
Physical devices used in access control include card readers, biometric readers, and keypads. The most important issue when using physical access control is security.
Step-by-step explanation:
Examples of physical devices used in access control:
1. Card Readers: These devices read access cards or key fobs with unique identifying information to grant or deny access.
2. Biometric Readers: These devices use unique physical characteristics such as fingerprints, retinas, or facial features to verify a person's identity.
3. Keypads: These devices require users to enter a numeric code to gain access.
The most important issue when using physical access control devices is security.
Physical access control is designed to keep unauthorized individuals out of restricted areas. Therefore, the most important issue is ensuring that the devices are secure and cannot be easily bypassed or tampered with. This includes implementing encryption, regularly updating firmware and software, and maintaining strict access protocols.