Configuration must follow a specific logical order:

1. switchport mode access: You must first set the interface to access mode; port security is rejected on ports in dynamic desirable/auto mode.
2. switchport port-security: Enables the port security feature on the interface.
3. switchport port-security maximum 2: Satisfies the requirement to permit exactly two MAC addresses.
4. switchport port-security violation shutdown: Ensures the port is effectively disabled ("unable to flood") if the maximum count is exceeded. The specific MAC commands are incorrect because the requirement is for "random" addresses. The sticky command is incorrect because "at a time" implies dynamic learning (allowing new devices after old ones age out), whereas sticky would permanently hardcode the first two devices.

Cisco Systems. (2016). Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX. "Configuring Port Security." Retrieved from Cisco.com. (Confirming switchport mode access is a prerequisite and shutdown is a violation mode).

Cisco Systems. (2023). Cisco IOS Security Configuration Guide: Securing the Data Plane, Release 15.2(7)E. "Port Security Overview." (Defines dynamic vs. sticky learning; confirms dynamic is used for non-persistent random devices).

Odom, W. (2016). CCENT/CCNA ICND1 100-105 Official Cert Guide. Cisco Press. Chapter 11: "Implementing Port Security," pp. 248-252. (Explicit sequence: Mode -> Enable -> Max/Violation).