220-1101 Question 220
Single answerSubscriber connector (SC)A technician is patching a multimode fiber run from a wall jack to a switch in a small office. The wall plate is labeled SC, but the patch cable the technician grabbed has smaller duplex connectors that will not fit the jack. Which replacement patch cable should the technician use to complete the connection without an adapter?
- A
An SC-to-SC multimode fiber patch cable
- B
An LC-to-LC multimode fiber patch cable
- C
An ST-to-ST multimode fiber patch cable
- D
An RJ45 Cat 6 patch cable
Show answer and explanation
Correct answer: A
Explanation
This question tests practical identification and use of subscriber connector (SC) fiber hardware. On the A+ Core 1 exam, candidates are expected to recognize common connector types and select the correct cable for the environment. SC connectors are fiber-optic connectors with a square body and push-pull design, while LC connectors are smaller and commonly used in high-density installations. ST connectors use a different locking mechanism and are not interchangeable with SC. Best practice is to match both the connector type and the fiber type, such as multimode versus single-mode, when selecting a patch cable. This aligns with standard networking documentation and cabling guidance used by fiber vendors and training materials, which emphasize verifying connector compatibility before connecting network equipment.
- A. Correct.
Correct. An SC connector is a square, push-pull fiber-optic connector commonly used on patch panels, wall jacks, and some network equipment. If the wall jack is labeled SC and the goal is to connect directly without using an adapter, the technician needs an SC-to-SC multimode fiber patch cable that matches both the connector type and the fiber type in use.
- B. Incorrect.
Incorrect. LC connectors are smaller than SC connectors, which matches the scenario description of the cable that does not fit. LC is a common fiber connector, but an LC-to-LC cable will not connect directly to an SC wall jack without a hybrid cable or adapter.
- C. Incorrect.
Incorrect. ST is a different fiber connector type that uses a bayonet-style twist lock. It is not compatible with an SC wall jack, so an ST-to-ST cable would not solve the problem even if the fiber type were otherwise correct.
- D. Incorrect.
Incorrect. RJ45 is used for twisted-pair copper Ethernet cabling, not fiber-optic wall jacks labeled for SC connectors. This distractor reflects a common mistake of confusing network media types when patching connections.