CompTIA A+ Core 1 (220-1201) Practice Questions with Explanations

Correct answer: C

A sandbox is an isolated computing environment designed to restrict a virtual machine's access to network resources and external systems. By definition, sandboxing prevents a VM from communicating with endpoints on the network or the internet, as this isolation is the primary purpose of the sandbox environment.

Why the other options are wrong:

• A. VDI (Virtual Desktop Infrastructure) is a deployment method that still allows network communication.
• B. A private cloud still allows internal network communication between resources.
• D. A Type 1 hypervisor is just the underlying virtualization layer and does not inherently prevent network communication.

Correct answer: C

A Type 2 hypervisor (hosted hypervisor) runs on top of an existing operating system and allows the customer to consolidate multiple bare-metal servers onto virtualized machines while maintaining control over the hardware in their own data center. This addresses both the privacy concern (data stays on-premises) and cost concerns (reducing physical hardware). IaaS would require external hosting, containers don't fully address OS compatibility for Windows/Unix/Linux mixes, and VDI is for desktop virtualization, not server consolidation.

Why the other options are wrong:

• A. IaaS would host infrastructure externally, raising data privacy concerns for a cost- conscious customer.
• B. Containers require containerized applications and don't effectively handle disparate OS requirements like Windows, Linux, and Unix.
• D. VDI (Virtual Desktop Infrastructure) is designed for desktop virtualization, not consolidating multiple bare-metal servers.

Correct answer: B

NFC (Near Field Communication) is specifically designed for short-distance wireless communication, typically within a few centimeters, between two devices. It enables quick data exchange between compatible devices without requiring pairing or complex setup, making it ideal for contactless payments and device communication.

Why the other options are wrong:

• A. NFC is wireless, not wired.
• C. NFC communicates between two devices, not multiple devices simultaneously.
• D. While NFC can facilitate file sharing, it is not limited to direct computer connections and serves many other purposes.

Correct answer: D

After checking for debris, the most cost-effective next step is to replace the keycap, which is a simple, inexpensive component that often resolves stuck or non-responsive keys. If the keycap replacement fails, then progression to replacing the key switch (mechanical component) or keyboard assembly would be warranted. Replacing the circuit board or entire keyboard should only occur after simpler fixes are exhausted.

Why the other options are wrong:

• A. Replacing the entire keyboard is expensive and premature before attempting simpler fixes like keycap replacement.
• B. Replacing the key switch is more costly and complex than first attempting a keycap replacement.
• C. Replacing the circuit board is the most expensive option and should only be considered after all other troubleshooting fails.

Correct answer: C

Infrastructure as a Service (IaaS) is the cloud service model where the provider delivers virtualized computing resources over the internet, including servers, storage, and networking. When a company deploys server machines in a public cloud, they are utilizing IaaS as they are renting and managing virtual server infrastructure rather than purchasing physical hardware.

Why the other options are wrong:

• A. Platform as a Service provides development environments and tools, not raw server infrastructure for deployment.
• B. Anything as a Service is not a standard cloud service model classification.
• D. Software as a Service delivers applications to end users, not server infrastructure for deploying company applications.

Correct answer: B

Port VLAN assignment is a standard feature of managed switches, allowing administrators to assign specific ports to different virtual LANs for network segmentation and traffic control. This is a core management capability that distinguishes managed switches from unmanaged ones.

Why the other options are wrong:

• A. Remote device power delivery is not a standard managed switch feature; that's typically a PoE injector capability.
• C. Content filtering is a firewall or application-layer feature, not a typical managed switch function.
• D. Load balancing is typically handled by dedicated load balancers or routers, not standard managed switches.

Correct answer: C

When a drive in a RAID 5 array shows an amber light, this indicates a failing or failed drive. The correct procedure is to replace the failing drive and allow the RAID controller to rebuild the array using the parity information stored across the remaining drives. RAID 5 can tolerate one drive failure, and the rebuild process will restore full redundancy and resolve both the slow speeds and errors caused by the degraded array state.

Why the other options are wrong:

• A. Network issues would not cause hard drive indicator lights to turn amber or directly cause file retrieval errors from the RAID array.
• B. Upgrading all drives is unnecessary and wasteful; only the failing drive needs replacement, and higher capacity does not address the current failure.
• D. Reformatting all drives would destroy data and is inappropriate; the RAID controller is designed to recover from single drive failures automatically.

Correct answer: C

A LAN (Local Area Network) is the appropriate network type for a group of devices in a single physical location, such as a room. A LAN allows multiple computers to connect to the same server and share internet access within a limited geographic area, making it ideal for friends in a room playing video games together.

Why the other options are wrong:

• A. A SAN (Storage Area Network) is specialized for storage device connectivity, not general gaming or internet access.
• B. A MAN (Metropolitan Area Network) covers a larger geographic area than a room, such as a city or campus.
• D. A PAN (Personal Area Network) is extremely limited in range and connects only a few personal devices, not suitable for multiple users in a room.

Correct answer: A

Slow startup times are most commonly caused by a failing or aging hard disk drive (HDD). HDDs have mechanical components that degrade over time, resulting in slow read/write operations during the boot process. An SSD would dramatically improve startup times, making HDD replacement the most effective solution for this symptom.

Why the other options are wrong:

• B. RAM affects overall system responsiveness and multitasking performance, but insufficient RAM doesn't typically cause slow startup times.
• C. Network interface card issues would affect network connectivity, not system startup speed.
• D. BIOS speed doesn't significantly impact overall startup duration; BIOS execution is a small fraction of boot time.

Correct answer: D

When a computer passes POST (Power-On Self-Test) but fails to boot the operating system, the issue is with storage/boot devices rather than core hardware like the CPU or power supply. The HDD (or storage device) is the most likely culprit, as POST checks basic hardware but does not verify the OS can be loaded from storage.

Why the other options are wrong:

• A. An audio card failure would not prevent the operating system from booting.
• B. A CPU failure would prevent the system from passing POST successfully.
• C. A power supply failure would prevent POST from completing; the system would not power on at all.

Correct answer: C

The vertical line appears only during copying and scanning, not during printing or faxing. This indicates the issue is with the document feeder path, which is used only when scanning or copying documents. The document feeder's rollers or guides would cause a consistent vertical line to appear on the scanned/copied output. Since normal printing and faxing work correctly, the issue is isolated to the input mechanism rather than the imaging drum or corona wire.

Why the other options are wrong:

• A. Pickup rollers feed paper from the tray during printing, but the issue doesn't affect printed or faxed output.
• B. Corona wire issues would affect all imaging processes including printing and faxing, which work correctly here.
• D. Drum assembly problems would cause defects in all output modes, but printing and faxing are unaffected.

Correct answer: A

Since identical tablets show different stylus charging issues and users purchase their own accessories, the problem is most likely caused by third-party cases that interfere with the stylus charging contacts or mechanism. This explains why some users with different cases experience problems while others with compatible cases do not.

Why the other options are wrong:

• B. If tablets needed updating, all identical tablets would exhibit the same issue.
• C. Manufacturing defects would affect the tablets themselves, not specifically the styluses, and would be consistent across identical units.
• D. Firmware updates on styluses would not explain why identical styluses work for some users but not others.

Correct answer: C

A DHCP reservation ensures a specific device receives the same IP address each time it connects to the network, even when the address pool is depleted. This is accomplished by marking specific MAC addresses to always receive predetermined IP addresses outside the normal lease allocation process, guaranteeing the printer always has a consistent IP regardless of overall address availability.

Why the other options are wrong:

• A. VLANs segment networks logically but don't guarantee specific IP address assignment to devices.
• B. A lease is a temporary assignment with an expiration time; it doesn't ensure permanent address retention when the pool is exhausted.
• D. An exclusion removes addresses from the pool so they won't be assigned, the opposite of what's needed to guarantee a specific address.

Correct answer: D

A PIN code is the appropriate security feature for pairing a hands-free car system via Bluetooth. PIN codes (typically 4-6 digits) are used during the initial Bluetooth pairing process to authenticate and establish a secure connection between devices. This prevents unauthorized devices from pairing with the car system.

Why the other options are wrong:

• A. BitLocker is a Windows full-disk encryption technology, not a Bluetooth pairing security mechanism.
• B. Biometrics (fingerprint, facial recognition) are not standard Bluetooth security features for initial pairing.
• C. TPM (Trusted Platform Module) is a hardware security chip for local device encryption and attestation, not Bluetooth authentication.

Correct answer: B

A Network Interface Card (NIC) failure is the most likely cause of slow network speeds. The NIC is the hardware component directly responsible for network communication. A failing NIC can cause reduced throughput, packet loss, and connection instability. While CPU, HDD, or RAM issues can impact overall system performance, a NIC failure specifically and directly affects network speed.

Why the other options are wrong:

• A. CPU issues typically cause slow system performance overall, not specifically slow network speeds.
• C. HDD failure would cause slow disk access and file operations, not network speed problems.
• D. RAM failure would result in system crashes, slowdowns, or errors, but not specifically slow network connectivity.

Correct answer: A

Repeated paper jams in a printer typically indicate worn or damaged internal components such as pickup rollers, separation pads, or feed mechanisms. A maintenance kit includes replacement parts for these wear-prone components and is the appropriate solution to resolve chronic jamming issues.

Why the other options are wrong:

• B. Replacing toner or ink cartridges addresses printing quality or output issues, not mechanical jamming problems.
• C. Installing a new ribbon is relevant only to impact printers, not modern office printers that jam due to mechanical wear.
• D. Changing the printhead addresses print quality defects, not paper feed or jamming issues.

Correct answer: D

A sandbox is an isolated testing environment specifically designed to safely execute and analyze potentially malicious files without risking the host system or network. It allows technicians to observe malware behavior in a controlled, contained space.

Why the other options are wrong:

• A. Multitenancy refers to sharing infrastructure among multiple users/organizations and is unrelated to malware testing.
• B. Test development is a software development practice, not a method for testing potentially malicious files.
• C. Cross-platform virtualization allows running different operating systems but is not specifically designed for safe malware analysis.

Correct answer: A

When deploying desktop PCs to a global, remote workforce, the technician must validate input voltage specifications because different countries use different electrical standards (110-120V vs 220-240V). Confirming compatible input voltage is critical to ensure the equipment will function safely and reliably across all deployment locations worldwide.

Why the other options are wrong:

• B. BIOS language support is a minor localization feature, not a critical specification for global deployment viability.
• C. Supply chain security relates to procurement and product integrity, not to confirming deployment capability to a remote workforce.
• D. While power efficiency is a consideration, it is not the primary specification needed to validate deployment capability across different electrical systems.

Correct answer: C

Intermittent connectivity issues with previous printers indicate that IP address changes or DHCP lease expirations were causing devices to lose connectivity. Assigning a static IP address to the printer ensures its IP address remains constant, preventing the connectivity drops caused by dynamic IP reassignment or lease renewal conflicts.

Why the other options are wrong:

• A. Configuring a gateway IP address is necessary for routing but does not prevent intermittent connectivity issues.
• B. Using DHCP would perpetuate the same problem that caused intermittent connectivity with previous printers.
• D. A public IP address is unnecessary for internal network printers and does not address the connectivity stability issue.

Correct answer: B

The USB-C cable is not compatible with Thunderbolt technology, which is the most likely issue. The laptop works with a USB-C docking station (which may be designed to work with standard USB-C or may have built-in adapters), but the projector requires Thunderbolt support. USB-C is a connector type, while Thunderbolt is a protocol standard. A Thunderbolt 3 or 4 port appears as USB-C physically but requires Thunderbolt-certified cables and devices for proper functionality.

Why the other options are wrong:

• A. Power injectors are not relevant to video/data connectivity issues with projectors.
• C. An adapter would not solve a fundamental protocol incompatibility between USB-C and Thunderbolt standards.
• D. Power delivery is not the issue since the same cable works fine for charging, indicating adequate power transmission capability.

Correct answer: A

The 2.4GHz frequency has longer wavelengths than 5GHz and 6GHz, which allows it to penetrate physical obstacles like walls more effectively. Lower frequency signals generally have better propagation through solid objects, making 2.4GHz the best choice for wall penetration among wireless standards.

Why the other options are wrong:

• B. 5GHz has shorter wavelengths and higher frequency, resulting in poorer wall penetration compared to 2.4GHz.
• C. 6GHz is even higher frequency than 5GHz and provides even worse penetration through physical objects.
• D. NFC (Near Field Communication) is a close-range technology designed for short distances and does not penetrate walls effectively.

Correct answer: D

SMB (Server Message Block) is the protocol used for accessing shared network folders and printing to network printers on Windows networks. Since the user needs to print from a shared network folder without public internet, SMB provides the necessary file sharing and print service functionality across the local network infrastructure.

Why the other options are wrong:

• A. ADF (Automatic Document Feeder) is a scanner hardware component, not a printing or network protocol.
• B. USB is a physical connection method and doesn't enable printing from a remote shared network folder.
• C. PCL (Printer Command Language) is a printer language for formatting print jobs, not a network file or print sharing protocol.

Correct answer: D

A Syslog server is specifically designed to collect, aggregate, and store log data and event information from network devices and hosts. It provides centralized logging for monitoring system events, errors, and diagnostic information across the network infrastructure.

Why the other options are wrong:

• A. DNS servers translate domain names to IP addresses; they don't collect event data.
• B. Mail servers handle email transmission and storage, not network event logging.
• C. Print servers manage printer resources and job queues, not system event collection.

Correct answer: D

When a monitor shows the same content as the laptop screen, it's configured in mirror/duplicate mode rather than extended mode. To use the monitor as an additional screen, the user must access Windows Display settings and configure the external monitor as an extended display, which will allow them to use both screens for different content simultaneously.

Why the other options are wrong:

• A. Hardware assistants are not needed for modern monitors; display configuration is handled through OS settings.
• B. A docking station is not required to resolve this issue; the monitor is already connected and recognized.
• C. Windows tiling arranges windows on existing displays but does not change the display mode from mirrored to extended.

Correct answer: C

The symptoms described-high CPU/memory usage and frequent pop-ups-are classic indicators of malware infection rather than network or driver issues. Updating anti-malware signatures and performing a system scan is the appropriate next step to identify and remove any malicious software causing these resource-intensive symptoms.

Why the other options are wrong:

• A. Network connectivity issues would not cause high local CPU/memory usage or pop- ups.
• B. Driver updates are unrelated to the malware symptoms being exhibited.
• D. DHCP and wireless settings would not cause the specific symptoms of malware activity like pop-ups and excessive resource consumption.

Correct answer: A

Infrastructure as a Service (IaaS) is the most suitable model for a disaster recovery solution based on virtual machines because it provides on-demand access to computing resources, storage, and networking infrastructure. Organizations can provision virtual machines, replicate data, and maintain failover capabilities without owning physical infrastructure. IaaS gives the control and flexibility needed for DR planning.

Why the other options are wrong:

• B. Security as a Service focuses on security controls and threat protection, not infrastructure provisioning for DR.
• C. Platform as a Service provides development frameworks and middleware, not the infrastructure-level control needed for VM-based disaster recovery.
• D. Software as a Service delivers applications to end-users, not the underlying infrastructure required for disaster recovery solutions.

Correct answer: A

A loudly running fan and display distortion are classic signs of overheating. The system increases fan speed to cool down when internal temperatures rise excessively, and thermal stress causes display artifacts and pixel errors. Both symptoms occurring together point directly to a thermal management problem.

Why the other options are wrong:

• B. Sluggish performance alone wouldn't typically cause display distortion or excessive fan noise.
• C. Overclocking CPU might increase fan speed but doesn't typically cause display distortion unless combined with instability.
• D. Crashing applications wouldn't cause continuous loud fan operation or display distortion as primary symptoms.

Correct answer: A

VDI (Virtual Desktop Infrastructure) is defined as streaming a graphical user interface to thin clients from a centralized server. This allows users to access their desktop environment remotely while the actual processing and storage occurs on the server. Option A correctly describes this architecture where the GUI is rendered and transmitted to lightweight client devices.

Why the other options are wrong:

• B. Provisioning a sandbox is a testing/isolation technique unrelated to VDI desktop delivery.
• C. High-performance workstations with local OS represent traditional computing, not VDI which centralizes resources.
• D. Launching a virtual machine on a hypervisor describes virtualization but not specifically VDI desktop infrastructure.

Correct answer: A

A private cloud model exclusively utilizes a local data center owned and operated by the organization. It provides dedicated infrastructure for a single customer with complete control over data and security. Public clouds use shared infrastructure managed by third parties, hybrid clouds combine both private and public elements, and community clouds serve specific groups but may not be entirely local.

Why the other options are wrong:

• B. Public clouds use shared infrastructure managed by third-party providers, not local data centers.
• C. Hybrid clouds combine both private and public cloud resources, not exclusively local.
• D. Community clouds serve multiple organizations but are not exclusively limited to a single local data center.

Correct answer: C

A hybrid cloud architecture allows organizations to keep sensitive data on private infrastructure while leveraging public cloud resources, enabling them to meet data residency and regulatory requirements that mandate data remain within specific geographic regions or under direct organizational control. This is a primary advantage over pure public cloud solutions where all data is hosted on the provider's infrastructure.

Why the other options are wrong:

• A. Hybrid cloud typically increases management overhead compared to public cloud due to managing both private and public environments.
• B. Cross-platform virtualization is not inherently tied to hybrid cloud architecture and can be used in any cloud model.
• D. Both public and hybrid clouds can leverage IaaS and PaaS; this is not a distinguishing advantage of hybrid cloud.

Correct answer: A

Devices assigned IP addresses starting with 169.254 are using APIPA (Automatic Private IP Addressing), which occurs when DHCP fails to assign addresses. Rebooting the wireless router will restart the DHCP service, allowing it to properly detect and configure connected devices with valid IP addresses from the DHCP pool. This is the quickest and most direct troubleshooting step for DHCP failures in a SOHO environment.

Why the other options are wrong:

• B. Shortening the lease time does not address the root cause of DHCP failure; devices still need DHCP to respond initially.
• C. Using static IP addresses bypasses DHCP but is impractical in a SOHO environment with multiple dynamic devices and does not fix the underlying router issue.
• D. Increasing the DHCP pool size is irrelevant if the DHCP service itself is not responding; the pool size is not the problem.

Correct answer: A

Toner coming off the page when wiped indicates a fusing problem. The fuser applies heat and pressure to permanently bond toner to paper. If toner doesn't adhere properly, the fuser is malfunctioning and should be replaced next. Since replacing the toner cartridge didn't resolve the issue, the problem is with the fuser mechanism, not the toner supply.

Why the other options are wrong:

• B. A faulty drum would cause image quality issues but would not result in toner wiping off after printing.
• C. Developer roller problems would affect toner distribution and image quality, not toner adhesion to paper.
• D. A discharge lamp issue would affect image formation and contrast, not toner permanence on the page.

Correct answer: C

3840x2160 is the standard resolution for Ultra HD (UHD) or 4K displays. It represents four times the pixel count of 1080p and is the widely adopted consumer and professional standard for ultra-high-definition content.

Why the other options are wrong:

• A. 1920x1080 is Full HD, not Ultra HD.
• B. 2048x1080 is a cinema-specific resolution, not a standard Ultra HD format.
• D. 7680x4320 is 8K resolution, which exceeds Ultra HD specifications.

Correct answer: A

The MX (Mail Exchange) record is the DNS record type that specifies mail servers and prioritizes email delivery to the correct mail server. To redirect email flow to different mail servers or change email routing, an administrator must modify the MX records.

Why the other options are wrong:

• B. TXT records store text information for various purposes like verification but do not control email flow routing.
• C. SPF records specify which servers are authorized to send email but do not redirect email flow themselves.
• D. CNAME records create aliases for domain names but are not used to redirect email flow to different mail servers.

Correct answer: D

The technician has already verified configuration settings, tested the physical cable, and replicated the issue with a known-good workstation on the same cable. This indicates the problem is with the network infrastructure itself. Checking network logs for port flapping would reveal if the switch port is rapidly cycling up and down, which would explain the dropping and reconnecting behavior observed by users.

Why the other options are wrong:

• A. Adding new hardware would not address the root cause and is premature without identifying the actual problem.
• B. Static IP assignment would not resolve a physical layer or switch port issue causing intermittent connectivity.
• C. While interference could cause issues, the fact that a known-good workstation replicated the problem on the same cable points to the switch port as the source.

Correct answer: C

A modular power supply allows technicians to connect only the necessary cables, leaving unused cables disconnected and hidden, thereby minimizing visible internal cabling. SATA drives still require visible cables, liquid cooling systems have visible tubes and fittings, and wireless NICs don't address internal cable visibility.

Why the other options are wrong:

• A. SATA drives still require visible data and power cables to connect to the motherboard and power supply.
• B. Liquid cooling systems include visible radiators, tubes, and hoses that add to internal cable clutter.
• D. A wireless NIC addresses network connectivity, not the number of visible internal cables.

Correct answer: C

When a manufacturer identifies a security vulnerability and provides notification, the appropriate remediation step is to update the printer's firmware. Firmware updates patch security vulnerabilities and should be applied promptly to protect the device from exploitation and maintain network security.

Why the other options are wrong:

• A. Disabling wireless connectivity is an overly restrictive workaround that limits functionality rather than fixing the underlying vulnerability.
• B. Enabling audit logging helps monitor activity but does not remediate the actual security vulnerability.
• D. Disabling the default gateway is not a standard remediation for printer vulnerabilities and would impair device functionality.

Correct answer: B

The error message indicates the computer cannot reach the domain controller to process the password change. When working from home, the user's computer is disconnected from the corporate network and cannot communicate with the domain controller. Connecting to the VPN establishes a secure tunnel to the corporate network, allowing the machine to reach the domain controller and complete the password reset. Restarting the computer, resetting the account in Active Directory, or joining Wi-Fi alone would not resolve the connectivity gap to the domain controller.

Why the other options are wrong:

• A. Restarting the computer will not resolve the underlying issue of being unable to reach the domain controller.
• C. Resetting the account in Active Directory requires administrative access and is not the user's responsibility; VPN connectivity is the missing link.
• D. Simply joining the Wi-Fi network does not provide access to the corporate domain controller unless it is a VPN connection.

Correct answer: B

The default gateway is the critical setting that routes traffic destined for networks outside the local subnet to the internet. If the firewall update misconfigured or blocked the default gateway setting, users can still access local resources (which don't require the gateway) but cannot reach the internet. Static IP assignments, subnet masks, and VLANs would not selectively block only internet access while preserving local network access.

Why the other options are wrong:

• A. Static IP assignments alone do not determine internet connectivity; the gateway is what enables external routing.
• C. An incorrect subnet mask would prevent access to both local and remote networks, not just internet access.
• D. VLAN configuration affects local network segmentation but would not selectively block only internet while allowing local access.

Correct answer: A

Bluetooth is a wireless personal area network (PAN) technology that connects devices over short distances (typically up to 10-100 meters). PANs are designed for interconnecting personal devices in a limited area, which is exactly what Bluetooth accomplishes.

Why the other options are wrong:

• B. LAN (Local Area Network) typically covers a larger area like an office or building and uses different technologies.
• C. WAN (Wide Area Network) covers much larger geographic distances and is not appropriate for Bluetooth's short-range design.
• D. SAN (Storage Area Network) is specifically for storage device connectivity and is unrelated to Bluetooth technology.

Correct answer: A

When a user copies configurations from an existing workstation to a new device without modification, both machines will have identical IP addresses. This creates an IP address conflict, causing both devices to experience unreliable network connectivity as the network switches between the two machines with the same address. This is a classic duplicate IP scenario.

Why the other options are wrong:

• B. DNS registering both hostnames would not prevent network access; it would simply create duplicate DNS entries.
• C. An improperly terminated cable would affect only that cable's connectivity, not cause issues with both devices when turned on.
• D. Switchport security settings would typically block or restrict a port, not cause connectivity issues for both devices simultaneously.

Correct answer: C

After a drop, the tablet fails to charge, indicating potential physical damage to the charging port. The USB-C port should be inspected first for debris, bent pins, or internal damage that would prevent proper connection and power transfer. This is the most direct cause of the charging failure and should be examined before attempting repairs that might mask a more serious underlying issue.

Why the other options are wrong:

• A. A hard restart won't resolve a hardware charging port issue; the problem is physical, not software.
• B. Battery replacement is premature before determining if the port itself is damaged and preventing charge detection.
• D. Digitizer diagnostics address the display's touch functionality, not the charging failure symptom.

Correct answer: A

Port 21 is the standard port number used for FTP (File Transfer Protocol), which is used for transferring files over a network. Port 53 is for DNS, port 68 is for DHCP, and port 389 is for LDAP.

Why the other options are wrong:

• B. Port 53 is used for DNS (Domain Name System), not file transfer.
• C. Port 68 is used for DHCP (Dynamic Host Configuration Protocol), not file transfer.
• D. Port 389 is used for LDAP (Lightweight Directory Access Protocol), not file transfer.

Correct answer: B

Plenum-rated cabling is specifically designed for use in plenum spaces-the shared air space above drop ceilings used for ventilation and air circulation. These cables use fire- retardant materials that produce minimal smoke and toxic fumes if they burn, meeting building codes and safety regulations for these critical spaces.

Why the other options are wrong:

• A. Shielded twisted pair addresses electromagnetic interference but has no special fire- safety rating for plenum use.
• C. Optical fiber doesn't require plenum-rating; it's used for long-distance high-speed connections, not typically overhead runs.
• D. Coaxial cable is rarely used for modern network installations and has no plenum- rating certification.

Correct answer: D

Lightning connectors are reversible by design, so the need to flip the cable to establish recognition indicates a physical port problem. The charging port is likely dirty (debris preventing proper contact) or internally damaged (bent or misaligned pins/contacts). Since the issue is specific to this one device and doesn't occur with other identical devices, it's a hardware defect in the port, not the cable itself.

Why the other options are wrong:

• A. A restart wouldn't resolve a hardware charging port recognition issue; the port either makes contact or it doesn't.
• B. A swelling battery would prevent charging entirely, not cause intermittent recognition based on cable orientation.
• C. If the cable were failing, flipping it wouldn't reliably resolve the issue, and the problem would likely occur with other devices too.

Correct answer: C

A community cloud is shared among multiple organizations with common interests, concerns, or missions-such as those in the same industry. This model allows organizations to share infrastructure and resources while maintaining separation from the general public cloud and other industries.

Why the other options are wrong:

• A. A public cloud is open to all users and not specific to organizations within a particular industry.
• B. A hybrid cloud combines public and private clouds but is not specifically designed for industry-specific organizational sharing.
• D. A private cloud is dedicated to a single organization and would not be shared among multiple companies in the same industry.

Correct answer: A

A dual-BIOS motherboard has a primary and secondary BIOS chip specifically designed for recovery scenarios. When a firmware update fails and corrupts the primary BIOS to the point where the UEFI menu is inaccessible and the system cannot boot, enabling the secondary BIOS configuration is the recovery method built into the motherboard design to restore functionality.

Why the other options are wrong:

• B. Downgrading firmware via USB would require accessing the UEFI menu or a recovery interface, which is not available in this scenario.
• C. Warranty repair is premature when a dual-BIOS motherboard's recovery feature is available and designed for exactly this situation.
• D. Reapplying thermal paste has no relevance to a firmware corruption issue and would not resolve the boot loop problem.

Correct answer: B

A PoE (Power over Ethernet) switch provides electricity to devices through network cables. PoE switches inject DC power onto standard Ethernet cables, allowing connected devices such as IP cameras, wireless access points, and VoIP phones to receive both data and power from a single cable connection, eliminating the need for separate power supplies.

Why the other options are wrong:

• A. An edge router routes network traffic but does not provide power delivery through network cables.
• C. An access point provides wireless connectivity but does not inherently deliver power through network cables unless it is a PoE-powered device itself.
• D. A patch panel is a passive connectivity device for organizing and terminating network cables; it does not provide electrical power.

Correct answer: A

The Power Supply Unit (PSU) is the most likely component to cause a complete system failure where the desktop PC does not turn on at all. If the PSU fails, no power is delivered to any component, preventing the entire system from starting. Without power, the system cannot reach POST or any operational state.

Why the other options are wrong:

• B. A failed GPU would not prevent the system from powering on; it would either not display video or fail after POST.
• C. Faulty RAM would cause POST failures or system hangs, but the system would still power on.
• D. A failed CPU would prevent POST completion, but the system would still attempt to power on and may show signs of trying to start.

Correct answer: B

Type 2 hypervisors (also called hosted hypervisors) run on top of an existing host operating system and require that OS to function. Unlike Type 1 bare-metal hypervisors, they depend on the underlying OS for hardware access and management.

Why the other options are wrong:

• A. Bare-metal installation is a characteristic of Type 1 hypervisors, not Type 2.
• C. Type 2 hypervisors can support remote management depending on the host OS capabilities.
• D. Type 2 hypervisors are less demanding hardware-wise than Type 1 since they leverage the host OS.