Explanation: Fiber-optic connections offer the highest speeds and bandwidth, making it the best choice for fast data transmission between nearby locations.

Explanation: If users are only able to save a small number of pictures on the microSD cards before running out of space, it suggests a formatting issue. Improper or incomplete formatting can lead to the card not utilizing its full storage capacity, resulting in significantly less available space for storing pictures. Formatting the microSD cards correctly would ensure the file system on the cards is set up properly, allowing the devices to use the full capacity of the cards for storage. Compatibility, UHD storage capability, and camera storage settings are less likely to be the issue in this scenario.
References: The necessity of proper formatting for storage devices is a fundamental aspect of managing digital storage, as outlined in the basic principles of digital storage and file systems.

Explanation: The technician has identified the symptoms (slow performance and random pop-ups) and must now establish a theory of probable cause, such as malware or spyware infection. This step aligns with the CompTIA troubleshooting methodology.
✑ Why Not A (Establish a knowledge base): This is irrelevant at this stage;
knowledge bases are used for reference and documentation.
✑ Why Not C (Establish a new theory and consider escalating): The technician has not yet created or tested a theory, making escalation premature.
✑ Why Not D (Establish a plan of action): Planning an action occurs after determining the cause of the problem.
CompTIA A+ Exam Reference: Core 2 (220-1102), Section 3.1, troubleshooting methodology.

Explanation: Dot Matrix printers do not use heat, they use a pin striking an inked ribbon (for the first copy, the subsequent copies are handled by the carbon paper) The ribbon is low on ink or missing and must be replaced to get proper output in a dot matrix printer that uses carbon paper.

References: CompTIA A+ Certification Exam Guide, Exam 220-1001, Page 361

Explanation: DKIM (DomainKeys Identified Mail) is an email authentication method that attaches a digital signature to outgoing emails to verify the email’s authenticity and detect email spoofing.
✑ SPF (Sender Policy Framework): Specifies which mail servers are authorized to send emails for a domain but does not involve digital signatures.
✑ DNS Pointer (PTR): Used for reverse DNS lookups, not email authentication.
✑ MX Records: Specify mail servers for email delivery but do not authenticate emails.
CompTIA A+ Exam Reference: Core 2 (220-1102), Section 2.4, email security and authentication.

Explanation: Client-side virtualization guest machines require isolation from other guest machines to maintain their security. Isolation ensures that each virtual machine is separated from others and runs its own operating system and applications, making it less vulnerable to attacks from other guest machines.
References: CompTIA A+ Certification Exam Objectives 220-1002 - Virtualization and cloud computing - 4.1

Explanation: Printers that use PostScript drivers are designed to handle complex printing tasks, including detailed graphics and images in PDF files. However, if the printer's PostScript driver is outdated, incompatible, or improperly configured, it may struggle to process and print PDF files containing images. Updating or reinstalling the PostScript driver, or choosing a different driver compatible with the printer and document type, can resolve this issue.

Explanation: A swollen battery can prevent a laptop from powering on as it disrupts connectivity or damages internal components. Identifying physical signs such as swelling or bulging is key, which aligns with the CompTIA A+ Core 1 objective on mobile device troubleshooting, specifically battery issues.

Explanation: https://techlibrary.hpe.com/docs/iss/proliant-gen10-uefi/s_enabling_VTd. html Enabling VT-d (Virtualization Technology for Directed I/O) in the server's BIOS settings is required for the hypervisor to run properly.

References: CompTIA A+ Certification Exam Guide, Ninth Edition, Chapter 11

Explanation: After setting up a RAID 5 array, the next step is to make the storage space usable by the operating system. This involves partitioning the array to define how the storage space is organized and then formatting it with a file system that the operating system can understand, thus making it possible to copy files to the array. Decreasing the number of drives, rebuilding the array, or checking the hot spare status would not address the issue of the array not being ready to store files.

Explanation: Client virtualization involves installing an application on a server and enabling multiple users to run the application simultaneously via virtualized sessions. This eliminates the need for individual installations on local machines.
✑ Why Not B (Software as a Service): SaaS delivers software over the internet and does not require local installations but is managed by a third party, not the organization itself.
✑ Why Not C (Sandboxing): Sandboxing is for isolating applications for security testing, not for concurrent user access.
✑ Why Not D (Embedded software): Embedded software is installed on hardware devices, not shared across multiple users.
CompTIA A+ Exam Reference: Core 1 (220-1101), Section 4.2, virtualization concepts.