220-1201 Practice Question: A technician is configuring a new router for a…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

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  Coaxial (F-type)

  Why it's wrong here

  Coaxial cables with F-type connectors are primarily utilized for traditional cable television and cable internet services, employing DOCSIS technology. These cables transmit radio frequency signals over copper, which is fundamentally different from the optical signals used in fiber internet. Therefore, an F-type coaxial connection cannot interface with a router for a fiber optic internet service, as the underlying transmission medium and signal type are incompatible.

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  RJ11 (phone jack)

  Why it's wrong here

  An RJ11 connector, commonly known as a phone jack, is designed for analog telephone lines and Digital Subscriber Line (DSL) internet services. DSL transmits data over standard copper telephone lines using specific modulation techniques. Fiber optic internet, however, relies on light pulses transmitted through glass or plastic fibers, making the RJ11 interface entirely unsuitable for connecting a router to a fiber optic network. The physical and electrical characteristics are incompatible with fiber technology.

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  Ethernet (RJ45)

  Why this is correct

  For fiber internet installations, the Optical Network Terminal (ONT) converts the incoming optical signal from the fiber optic line into an electrical signal. This electrical signal is then outputted via a standard Ethernet port, typically an RJ45 connector. The router's WAN (Wide Area Network) port is designed to accept this Ethernet connection, establishing the internet link from the ONT to the router for distribution within the local network. This is the standard interface for connecting a consumer router to a fiber-based internet service.

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  Fiber patch cable (LC connector)

  Why it's wrong here

  While fiber optic cables with LC connectors are indeed integral to fiber internet infrastructure, connecting the fiber line from the street to the Optical Network Terminal (ONT) inside the premises, they are not typically used to directly connect the ONT to a standard consumer router. Consumer routers are almost universally equipped with RJ45 Ethernet WAN ports, not fiber optic input ports. The ONT performs the crucial optical-to-electrical conversion, presenting an Ethernet signal to the router rather than a raw fiber connection.

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