220-1101 Question 10
Single answerWi-Fi antenna connector/placementA technician is replacing a damaged external Wi-Fi antenna on a desktop PC used in a warehouse office. The PC has a wireless adapter with two small threaded antenna ports on the rear bracket. The replacement antenna kit includes cables labeled RP-SMA and SMA. The technician also notices the PC is pushed under a metal desk beside a filing cabinet, and users report weak signal and frequent disconnects. Which action should the technician take FIRST to restore proper Wi-Fi operation while avoiding hardware mismatch?
- A
Verify the adapter uses RP-SMA connectors, attach the correct antenna, and move the antenna/PC away from the metal obstruction if possible
- B
Attach the SMA antenna to either port because Wi-Fi antenna connectors are interchangeable on most consumer adapters
- C
Leave the antenna disconnected and instead increase the access point transmit power to compensate for signal loss
- D
Connect only one antenna, because the second antenna port is used only for Bluetooth on dual-band adapters
Show answer and explanation
Correct answer: A
Explanation
This question tests two practical A+ Core 1 skills: identifying the correct Wi-Fi antenna connector and applying good antenna placement practices. In real deployments, external desktop Wi-Fi antennas commonly use RP-SMA connectors, and technicians must confirm connector type before attaching a replacement antenna. SMA and RP-SMA are visually similar but are keyed differently by the center conductor arrangement. From a placement perspective, RF best practice is to avoid placing antennas behind or under metal surfaces, filing cabinets, and desks because these objects can block, absorb, or reflect signal. Moving the antenna or system to a less obstructed location is often one of the fastest ways to improve signal strength and stability. These actions align with standard wireless troubleshooting guidance from hardware vendors and general WLAN deployment best practices.
- A. Correct.
Correct. Many desktop Wi-Fi adapters use RP-SMA connectors for removable antennas, and using the correct connector type is important to avoid incompatibility or damage. After confirming the proper antenna connection, improving antenna placement by moving it away from metal desks, cabinets, and other obstructions is a practical first step because metal can attenuate and reflect RF signals, reducing signal quality and causing disconnects.
- B. Incorrect.
Incorrect. SMA and RP-SMA are not interchangeable even though they look similar. Their center pin/socket arrangement differs, so forcing the wrong connector can damage the antenna or adapter and will not provide a proper RF connection. This is a common misconception because the threaded shells appear alike.
- C. Incorrect.
Incorrect. A Wi-Fi device should not be operated without the required antenna attached, and changing access point power does not address the immediate issue of a missing or mismatched client antenna. Also, transmit power changes may not solve poor client-side reception caused by bad antenna placement or connector mismatch.
- D. Incorrect.
Incorrect. On many Wi-Fi adapters, two external antenna ports are used for Wi-Fi functions such as MIMO/diversity, not because one is dedicated to Bluetooth. While some combo cards support Bluetooth separately, the visible dual antenna ports on a desktop Wi-Fi bracket are typically both for the WLAN radio system. Using only one antenna can reduce performance and reliability.