Certified Protection Professional (CPP) Practice Exam

The most reliable method of protection against telephone line eavesdropping is to avoid discussing sensitive information altogether. This approach is inherently safe because it negates the risk of sensitive data being intercepted during a conversation. By not disclosing any confidential details over the phone, there is effectively no opportunity for eavesdroppers to capture that information, ensuring complete confidentiality.

While other options such as encryption equipment or switching to digital communication can enhance security, they do not guarantee total protection against eavesdropping. Encryption relies on the effective implementation and use of complex technology, which can sometimes be compromised. Similarly, digital communication methods can still be intercepted or hacked. Creating passwords may provide an additional layer of security but does not eliminate the risk of sensitive discussions being overheard.

Therefore, refraining from talking about sensitive subjects is the most straightforward and dependable method to safeguard against the risks of eavesdropping on telephone lines.