Which of the following penetration testing techniques automatically tests every phone line in an exchange and tries to locate modems that are attached to the network? 

Answer options:

A. Demon dialing
B. Sniffing
C. Social engineering
D. Dumpster diving

Information about these modems can then be used to attempt external unauthorized access. Answer: B is incorrect. In sniffing, a protocol analyzer is used to

The demon dialing technique automatically tests every phone line in an exchange and tries to locate modems that are attached to the network. most commonly used technique of all, getting information (like passwords) just by asking for them.