The goal of what type of security is to adequately supervise and protect the communications between the alarmed area and the monitoring station to prevent modification and substitution of the transmitted signal.

• A. Perimeter security
• B. Transmission Line
• C. Network security
• D. Electronic security

Answer: (B)

Securing the communications channel between the protected area and the monitoring station focuses on keeping the alarm signal intact and authentic as it travels. The aim is to prevent anyone from altering or substituting the transmitted signal, which would undermine the alarm’s reliability. This is what transmission line security covers: protecting the path that carries the alarm data, using measures such as line supervision, tamper-resistant cabling, encryption, authentication, and sometimes redundancy to detect tampering. Other concepts like perimeter security, network security, or broad electronic security don’t specifically target the integrity of the signal as it moves from the monitored area to the monitor, making transmission line security the best fit.