What is RJ 11 ?

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Sure, here's more detailed information about RJ-11 connectors for the CompTIA A+ exam:

RJ-11 connectors are small plastic connectors used on telephone cables². They are one of the most common types of connectors used in telecommunication applications.
An RJ-11 connector is a six-position, four-conductor** plug. This means it has six positions for contacts, and typically has four contacts installed. These contacts are usually made of a gold-plated material to ensure a reliable connection.
The four wires in an RJ-11 connector are used in two pairs for connections, with one pair typically left unused. This is because most telephone lines only require two wires to function.
RJ-11 connectors are commonly used to connect devices like telephones and modems to telephone lines. They are also used in DSL internet connections².
Despite the availability of newer and more advanced connectors like RJ-45, RJ-11 connectors are still widely used, especially in residential and small office settings.
For the CompTIA A+ exam, it's important to understand the physical characteristics of RJ-11 connectors, as well as their typical uses and applications.

Remember, for the most accurate and detailed information, you should refer to the official CompTIA A+ exam objectives or authorized study materials.

Source:

(1) comptia Network+ : Different Types Of Cabling Standards - ExamGuides.com. https://www.examguides.com/Networkplu....
(2) CompTIA A+ Core 1: Cable Types & Connectors Flashcards. https://quizlet.com/772695174/comptia....
(3) CompTIA ® A+ Exam Notes : Identify The Various Types Of Network Cables .... https://www.examguides.com/Aplus-Esse....