- (Topic 2)
A technician receives a ticket that states a mobile payment device is having Issues with Its contactless payment feature. The device is not detecting payment options. Which of the following Is the MOST likely cause of the Issue?
Correct Answer:
A
NFC (Near Field Communication) is the technology used for contactless payment features on mobile payment devices. If a mobile payment device is having issues with its contactless payment feature and is not detecting payment options, it is most likely due to an issue with the NFC functionality of the device.
The contactless payment feature on a mobile payment device uses NFC (Near Field Communication) to detect payment options. If the device is not detecting payment options, the issue may be related to a problem with the NFC feature. References: https://www.techopedia.com/definition/31790/near-field-communication-nfc
- (Topic 4)
Which of the following wireless networking protocols will support both 2.4GHz and 5GHz devices?
Correct Answer:
B
802.11 ax is a wireless networking protocol that supports both 2.4GHz and 5GHz devices, as well as backward compatibility with previous 802.11 standards. 802.11 ax offers higher data rates, lower latency, increased capacity, and improved power efficiency than previous protocols. It is also known as Wi-Fi 6 or High Efficiency Wireless (HEW). Reference: https://www.comptia.org/training/books/a-core-1-220-1101-study-guide (page 82)
- (Topic 1)
A user contacts the help desk in reference to a failing thumbprint scanner. The user states the scanner was functioning correctly yesterday. Which of the following troubleshooting steps should be performed FIRST after the ticket has been filed?
Correct Answer:
A
http://www.221021.com/Hardware/input-output-devices/32310.html
* 1. Identify the problem.
Gather information from the user, identify user changes, and, if applicable, perform backups before making changes.
Inquire regarding environmental or infrastructure changes.
* 2. Establish a theory of probable cause (question the obvious).
If necessary, conduct external or internal research based on symptoms.
* 3. Test the theory to determine the cause.
Once the theory is confirmed, determine the next steps to resolve the problem. If the theory is not confirmed, re-establish a new theory or escalate.
* 4. Establish a plan of action to resolve the problem and implement the solution. Refer to the vendor's instructions for guidance.
* 5. Verify full system functionality and, if applicable, implement preventive measures.
* 6. Document the findings, actions, and outcomes.
- (Topic 4)
A user reports being unable to access the network. A help desk technician notices an APIPA on the user's workstation. Which of the following services should the technician investigate first?
Correct Answer:
B
DHCP (Dynamic Host Configuration Protocol) is a network service that automatically assigns IP addresses and other configuration parameters to devices that request them. DHCP simplifies the management of IP addresses and avoids conflicts and errors67. An APIPA (Automatic Private IP Addressing) is a feature of Windows that assigns a default IP address in the range of 169.254.x.x to a device when it cannot obtain a valid IP address from a DHCP server. An APIPA indicates that there is a problem with the DHCP service or the network connectivity between the device and the DHCP server89. Therefore, the technician should investigate the DHCP service first to check if it is running, configured correctly, and has enough available IP addresses to assign. The other services are not directly related to the IP address assignment. RADIUS (Remote Authentication Dial-In User Service) is a protocol that provides centralized authentication, authorization, and accounting for network access10. AAA (Authentication, Authorization, and Accounting) is a framework that controls the access and usage of network resources11. DNS (Domain Name System) is a service that resolves domain names into IP addresses12.
References
6: What is DHCP (Dynamic Host Configuration Protocol)? - Definition from WhatIs.com 7: How DHCP works - Windows Server | Microsoft Docs
8: What is APIPA (Automatic Private IP Addressing)? - Definition from WhatIs.com 9: How to Fix an IP Address Conflict
10: What is RADIUS (Remote Authentication Dial-In User Service)? - Definition from WhatIs.com
11: What is AAA (authentication, authorization, and accounting)? - Definition from WhatIs.com
12: What is DNS (Domain Name System)? - Definition from WhatIs.com