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An intranet connected to the internet is often protected by __________

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in Analog Communications by (122k points)
An intranet connected to the internet is often protected by __________

(a) a DNS

(b) a “brick wall”

(c) a “fire wall”

(d) antivirus

The question was asked in final exam.

My question comes from Digital Multiplexing in portion Multiplexing & Sampling of Bandpass Signal of Analog Communications

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Correct answer is (a) a DNS

The explanation is: Intranet uses internet technologies, but is insulated from the global internet. An intranet connected to the internet is often protected by DNS.

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