- A
Coaxial (F-type)
Why wrong: Coaxial is used for cable internet, not fiber.
- B
RJ11 (phone jack)
Why wrong: RJ11 is used for DSL connections, not fiber.
- C
Ethernet (RJ45)
The ONT outputs Ethernet to connect to a router for fiber internet.
- D
Fiber patch cable (LC connector)
Why wrong: Fiber patch cables connect the ONT to the wall, not typically directly to a router.
Question 422 of 1,020
Fiber Optic Router to ONT Connection Type
This 220-1201 practice question tests your understanding of internet connection types. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is configuring a new router for a client who has a fiber-optic internet connection. Which type of interface is most likely used to connect the router to the ISP's ONT (Optical Network Terminal)?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Quick Answer
The answer is Ethernet (RJ45). This is the correct interface because a fiber optic router connection type relies on the Optical Network Terminal (ONT) to convert the incoming optical light signals into standard electrical signals, which the router then receives through a standard Ethernet port. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of how different WAN technologies physically connect to customer premises equipment; a common trap is confusing the fiber patch cable that links the ONT to the wall with the router’s connection, or mistakenly choosing coaxial (cable internet) or RJ11 (DSL). Remember that the ONT acts as a media converter, so the router always connects to it via a twisted-pair Ethernet cable. A simple memory tip: think “ONT to Router = RJ45,” because the fiber stops at the ONT, and copper Ethernet takes over from there.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ethernet (RJ45)
The correct interface is Ethernet (RJ45) because the ONT typically converts the fiber-optic signal from the ISP into a standard electrical Ethernet signal, which is then delivered to the customer's router via a copper Ethernet cable. Most residential and small business fiber installations use an RJ45 port on the ONT to connect to the router's WAN interface, supporting speeds up to 1 Gbps or higher using 1000BASE-T.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Coaxial (F-type)
Why it's wrong here
Coaxial is used for cable internet, not fiber.
- ✗
RJ11 (phone jack)
Why it's wrong here
RJ11 is used for DSL connections, not fiber.
- ✓
Ethernet (RJ45)
Why this is correct
The ONT outputs Ethernet to connect to a router for fiber internet.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Fiber patch cable (LC connector)
Why it's wrong here
Fiber patch cables connect the ONT to the wall, not typically directly to a router.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'fiber-optic internet connection' and immediately assume the router must use a fiber patch cable (LC connector), forgetting that the ONT already converts the signal to Ethernet, so the router connects via a standard RJ45 Ethernet cable.
Detailed technical explanation
How to think about this question
The ONT acts as a media converter, translating the optical signal (typically using GPON or EPON standards) into an electrical Ethernet signal via an RJ45 port. In some enterprise or high-speed scenarios, a router may have an SFP slot that accepts a fiber transceiver (e.g., 1000BASE-LX), but the question specifies a 'new router' for a client, which in the 220-1201 exam context implies a typical SOHO router with a built-in RJ45 WAN port. The ONT's Ethernet port usually runs at 1000BASE-T, but can also negotiate 2.5GBASE-T or 5GBASE-T on newer models.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Internet Connection Types — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Internet Connection Types — This question tests Internet Connection Types — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ethernet (RJ45) — The correct interface is Ethernet (RJ45) because the ONT typically converts the fiber-optic signal from the ISP into a standard electrical Ethernet signal, which is then delivered to the customer's router via a copper Ethernet cable. Most residential and small business fiber installations use an RJ45 port on the ONT to connect to the router's WAN interface, supporting speeds up to 1 Gbps or higher using 1000BASE-T.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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