RADIUS (Remote Authentication Dial-In User Service)provides centralized Authentication, Authorization, and Accounting (AAA) for users who connect and use a network service.

FromQuentin Docter – CompTIA A+ Complete Study Guide:

“RADIUS is a widely used protocol for implementing AAA in network environments, allowing centralized control over user access and accounting.”

Multifactor authentication (MFA) is considered one of the most effective security measures for cloud environments. It requires users to verify their identity using two or more factors (e.g., password + phone app code), making it significantly harder for external attackers to gain access, even if the primary password is compromised.

B. Encryption is important for data protection but doesn’t prevent unauthorized logins.

C. Backups protect against data loss but don’t stop breaches.

D. Strong passwords are helpful but can still be phished or cracked — MFA adds a critical extra layer.

A low-cost home lab for practicing server management and scripting strongly points to Linux because it is widely available at no cost and is designed to support many server-style workloads. The All-in-One guide states plainly: “Linux is a popular, free, open source operating system,” and notes that there are many distributions (distros), giving flexibility for different needs. Quentin Docter adds key context about Linux’s purpose: Linus Torvalds created it as “a completely open source operating system for the world to use… completely free for anyone to use,” and highlights that many Linux distributions exist today.

From a cost standpoint, Docter’s licensing section defines open source as “not only… free, but the source code… is also shared,” and explicitly lists “OSs such as Linux” as open source examples. This directly supports “low-cost.”

Finally, Linux is a common target environment for real server administration and scripting practice (shell tools, package repositories, services), making it the best match versus ChromeOS/macOS/Windows for this lab goal.

Public Wi-Fi networks often usecaptive portals, which require accepting terms or authenticating via the pop-up page before full access is granted. Closing it prematurely stops full connection.

FromTravis Everett – All-in-One Exam Guide:

“Captive portals intercept the first HTTP request and present a login or acknowledgment screen. Without completing it, access is denied.”

Event Viewer is the best tool to analyze the root cause of service failures in Windows. It provides detailed logs from system processes, including errors, warnings, and crash reports related to services and applications. When a service starts and stops unexpectedly, Event Viewer will often record the cause, such as dependency failures or access violations.

B. Task Manager shows active processes but doesn ' t retain logs or causes of failure.

C. Internet Options is used for configuring browser settings, not troubleshooting services.

D. Process Explorer is powerful but more suited for live monitoring and detailed process trees, not post-failure log analysis.

The correct answer is C. XDR (Extended Detection and Response), which is designed to provide holistic security visibility across endpoints, networks, servers, cloud workloads, and email systems. Unlike traditional endpoint-only solutions, XDR correlates data from multiple security layers to detect and respond to advanced threats.

According to the Quentin Docter – CompTIA A+ Complete Study Guide, XDR expands upon EDR by integrating telemetry from network traffic, firewalls, identity systems, and cloud platforms. This enables detection of threats that move laterally or originate outside a single host.

The Travis Everett & Andrew Hutz – All-in-One Exam Guide explains that XDR is specifically designed to detect attacks that bypass endpoint protections by analyzing network-level behavior, command-and-control traffic, and cross-system activity.

The Mike Meyers / Mark Soper Lab Manual contrasts XDR with other options: RADIUS is an authentication protocol, UAC is a local Windows privilege control, and antivirus focuses only on known malware signatures at the host level. None of those provide network-wide visibility and coordinated response.

Because the question explicitly mentions traffic outside the host and at the network level, XDR is the only technology designed to meet that requirement, making C the correct answer.

The first step in the IT change management process is to identify and propose the change. In this case, the technician notices a need (end-of-life network switches), so the appropriate action is to formally propose a change. This proposal would be documented and submitted for approval before any planning or implementation occurs.

According to the CompTIA A+ 220-1102 objectives under Operational Procedures (Domain 4.0), the change management process follows these typical steps:

Submit a change request (Propose the change)

Review and approval (Approve the change)

Planning and scheduling (Schedule the change)

Implementation

Documentation and review

Therefore, proposing the change is the correct first step in accordance with standard ITIL-based change management practices.

The correct answer is A. SOP (Standard Operating Procedure) because SOPs are specifically designed to document roles, responsibilities, workflows, and support expectations for systems and applications within an organization. When deploying a new application, clear documentation is essential to ensure consistent support, escalation, maintenance, and troubleshooting.

The Quentin Docter – CompTIA A+ Complete Study Guide defines SOPs as formal documents that outline who performs specific tasks, how tasks are performed, and when escalation is required. SOPs are commonly used by IT departments to standardize support processes and ensure continuity, especially when multiple technicians or teams are involved.

The Travis Everett & Andrew Hutz – All-in-One Exam Guide explains that SOPs are a key component of operational maturity, ensuring that support staff understand their responsibilities and follow approved procedures when responding to incidents or service requests related to an application.

The Mike Meyers / Mark Soper Lab Manual further clarifies that documents such as NDAs focus on confidentiality, EULAs define usage rights for end users, and DRM is a technical mechanism—not a documentation framework. None of those options describe internal support roles.

Because the scenario explicitly mentions documenting roles and responsibilities, the correct and intended document type is a Standard Operating Procedure, making A the correct answer.

The correct answer is A. Reinstalling the application, because the issue appears to be application-specific rather than system-wide. The problem only affects one game, the operating system is fully updated, and there are no storage constraints. These indicators strongly suggest corrupted application data or a faulty app installation.

According to the Quentin Docter – CompTIA A+ Complete Study Guide, when a single application crashes repeatedly, the first recommended troubleshooting step is to remove and reinstall the app. This clears corrupted files, resets application settings, and ensures the latest compatible version is installed.

The Travis Everett & Andrew Hutz – All-in-One Exam Guide emphasizes that factory resets should only be used as a last resort, as they are disruptive and erase user data. Disabling background applications may help performance issues but does not typically resolve persistent crashes tied to one specific app.

The Mike Meyers / Mark Soper Lab Manual further clarifies that date and time misconfiguration usually affects authentication or certificate validation, not game stability.

Because the symptoms are isolated to a single application and basic system factors have already been ruled out, reinstalling the application is the most appropriate first troubleshooting step, making A the correct answer.

An " OS Not Found " error typically indicates that the computer is attempting to boot from a drive that doesn ' t contain a valid operating system or bootable partition. The presence of a USB drive might be confusing the boot order. Therefore, the first step a technician should take is to verify and adjust the boot sequence in the system’s firmware (BIOS or UEFI). It ' s possible that the USB drive is being prioritized over the internal hard drive, which may cause the system to miss the OS entirely.

A. Running data recovery tools is premature before confirming boot order.

B. Repartitioning the disk would destroy existing data—this should not be done until confirmed the OS is actually missing.

D. Switching between UEFI and BIOS (legacy mode) might help in rare cases, but it is not the first step in standard OS boot issue troubleshooting.