What refers to legitimate users accessing networked services that would normally be restricted to them?

What refers to legitimate users accessing networked services that would normally be restricted to them?
A .  Spoofing
B .  Piggybacking
C .  Eavesdropping
D .  Logon abuse

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Answer: D

Explanation: Unauthorized access of restricted network services by the circumvention of security access controls is known as logon abuse. This type of abuse refers to users who may be internal

to the network but access resources they would not normally be allowed. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 74).