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Multiple choice technology security

In the OSI reference model, on which layer can a telephone number be described?

  1. Layer1, as a telephone number represents a series of electrical impulses

  2. Layer 3, because a telephone number describes communication between different networks

  3. This depends on the nature of the telephony system (for instance, Voice-over-IP versus public switched telephony network (PSTN))

  4. None, as the telephone system is a circuit-based network and the OSI system only describes packet-switched networks
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