(ISC)2 Certified in Cybersecurity Practice Exam

What are RJ-11 cables primarily used for?

1. Computers

2. Monitors

3. Printers

4. Telephone connections

The correct answer is: Telephone connections

RJ-11 cables are primarily used for telephone connections. This specific type of cable is designed to connect telephones to wall jacks or to connect various telecommunication devices. RJ-11 connectors are typically found in residential and commercial telephone systems, handling standard analog phone signals as well as some digital signals used in voicemail and other services. The infrastructure of RJ-11 cables allows for the transmission of voice and, in some cases, limited data over short distances, making them essential for traditional telephony. Their construction supports a simpler design compared to cables used for more data-intensive applications, such as Ethernet (which commonly uses RJ-45 connectors). While there are other options such as computers, monitors, and printers, these devices typically rely on different types of connections. Computers and printers usually employ USB or Ethernet connections for data transfer, while monitors use VGA, HDMI, or DisplayPort connections for video. Hence, RJ-11's role is distinctly focused on telephone communication.