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Normal private branch exchange (PBX) or POTS/PSTN voice communications are vulnerable to all of the following except:
Eavesdropping
Interception
Tapping
Phishing
The correct answer is phishing. Phishing is a form of social engineering that attempts to trick users into giving up sensitive information, opening an attachment, or clicking a link. (Source: (ISC)2 Official Study Guide, 7th Edition). Correct answer should be Vishing. Unless you know something about getting emails to your POTS (you can't.)
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