Which statement best describes the role of data-link security in BCC operations?

• A. It reduces data integrity.
• B. It increases system vulnerability.
• C. It only affects physical security.
• D. It ensures encryption and authentication for data integrity, mitigates spoofing/jamming risks, and may trigger degraded operations if compromised.

Answer: (D)

Data-link security in BCC operations is about protecting information as it moves across the network link. It provides encryption and authentication so data cannot be read or altered in transit and so commands come from trusted sources, preserving data integrity. It also helps mitigate spoofing and jamming risks by verifying the identity of devices and detecting abnormal patterns. If a breach or failure is detected, the system can trigger degraded operations to maintain safety and limit impact.

So, it’s not about reducing integrity or increasing vulnerability, and it isn’t limited to physical security—the protection at the data-link layer supports both confidentiality and trust in the communication path.