(ISC)2 Certified in Cybersecurity Practice Exam

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What is a common application of RJ-11 cables?

High-speed internet connections
Telephone communication
Data transfer between computers
Connecting peripherals to computers

The correct answer is: Telephone communication

RJ-11 cables are primarily designed for telephone communication. They are commonly used to connect traditional landline telephones to wall sockets and provide the necessary interface for analog telephone service. The structure of RJ-11 connectors is optimized for voice frequency signals, making them suitable for carrying voice calls over the Public Switched Telephone Network (PSTN). In the context of the other options, high-speed internet connections typically utilize RJ-45 cables (for Ethernet) rather than RJ-11, as RJ-45 is designed to handle higher data rates and larger bandwidths. Data transfer between computers often uses various high-speed connections like USB or Ethernet rather than the lower bandwidth offered by RJ-11. Connecting peripherals to computers frequently involves USB connections, which are not associated with RJ-11. Thus, the application of RJ-11 cables in the domain of traditional phone communication is the most appropriate choice.