Which of the following protocols is said to use a web of tru

Which of the following protocols is said to use “a web of trust”?

A. PKI

B. IGMP

C. PGP

D. PEM

Solution

C. Pretty Good Privacy (PGP) uses a web like model because there are no Certificate Authorities; there are only end users. Anyone who uses PGP must determine whom they trust: Without a Certificate Authority, there is no centralized or governing agency to control and validate other users. Answer A is incorrect because PKI does not use a web of trust. Answer B is incorrect because IGMP is used for multicast router group management. Answer D is incorrect because Privacy Enhanced Email (PEM) is an email-security protocol.