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220-1201 Practice Question: A small business owner wants to use a smartphone…
A small business owner wants to use a smartphone as a point-of-sale (POS) terminal for credit card payments. They ask which accessory is essential for this setup. What should you recommend?
⚠ Common exam trap
The 220-1201 exam often tests the distinction between essential accessories for specific functions versus general-purpose accessories; the trap here is that candidates may choose a power bank or rugged case as 'essential' for business use, but the question specifically asks for the accessory required to enable credit card payments, which is the magnetic stripe reader.
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
✓
A magnetic stripe reader that plugs into the headphone jack.
A magnetic stripe reader that plugs into the headphone jack is the essential accessory for using a smartphone as a POS terminal for credit card payments. This reader captures the magnetic stripe data from the card and transmits it to the smartphone via the analog audio interface, enabling the payment processing app to read the card information. Without this reader, the smartphone cannot physically read the magnetic stripe, which is the most common method for swiping credit cards at a POS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A portable Bluetooth speaker for transaction alerts.
Why it's wrong here
A portable Bluetooth speaker is not an essential accessory for enabling a smartphone's Point of Sale (POS) functionality. While it could amplify transaction alerts, the smartphone already possesses a built-in speaker capable of providing audio feedback for successful or failed transactions. The primary requirement for POS is processing payments, not enhanced audio output.
- ✗
A rugged case to protect the phone from drops.
Why it's wrong here
A rugged case provides physical protection against drops and impacts, which is beneficial for device longevity in a business environment. However, it does not add any functional capability required for the smartphone to operate as a Point of Sale system. The core POS functionality relies on software and payment processing peripherals, not external physical durability.
- ✓
A magnetic stripe reader that plugs into the headphone jack.
Why this is correct
A magnetic stripe reader that plugs into the headphone jack is a crucial peripheral for enabling a smartphone to function as a mobile Point of Sale (mPOS) system. This device allows the smartphone to read payment card data from traditional magnetic stripe cards, converting the analog audio signal from the reader into digital data for transaction processing. It directly facilitates the primary function of accepting card payments.
- ✗
A high-capacity power bank for extended use.
Why it's wrong here
A high-capacity power bank is useful for extending the operational time of a smartphone, especially during prolonged use as a POS device without access to a wall outlet. However, it is not an essential component for *enabling* the POS functionality itself. The phone must first be capable of processing transactions, which a power bank merely sustains, rather than provides.
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TCP/IP and Common Ports for A+
Key term
Interface
An interface is a point of connection or interaction between two systems, devices, or software components that allows them to exchange information or signals.
Key term
Smartphone
A smartphone is a handheld mobile device that combines cellular communication with computing capabilities, running an operating system that supports third-party applications, internet connectivity, and a touchscreen interface.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.