CISSP Practice Exam 2025 – Complete Prep Guide

The correct answer highlights a network feature that lacks robust security measures and is easily spoofed or manipulated. Caller ID is a system that transmits the telephone number of the calling party, but it can be easily falsified, allowing individuals to pretend to be someone else. This inherent vulnerability makes it a weak authentication method when relied upon for confirming identities.

In contrast, username and password authentication, while also relatively weak due to susceptibility to phishing and brute force attacks, does offer a more conventional form of identity verification than Caller ID. Two-factor authentication adds an additional layer of security by requiring a second form of identification, significantly strengthening the authentication process. Digital certificates utilize cryptographic methods to establish trust, making them a strong form of authentication when properly implemented. Therefore, Caller ID's superficial verification capability, combined with its ease of manipulation, positions it as the weak authentication method in this context.