A+ 1101 Q05

Which of the following would be BEST reason to use a virtual machine as a sandbox?

• A. To test new software in a safe environment

• B. To increase the efficient use of computing resources

• C. To run multiple machines on the same hardware

• D. To have dedicated hardware for a single system

Answer explanation

A. To test new software in a safe environment

A sandbox is a testing environment that isolates new or untrusted software from the rest of the system, allowing the software to be tested without risking damage to the host system. Using a virtual machine as a sandbox allows the technician to test new software in an isolated environment, which is safe and won't affect the other software and the host operating system. This is considered the best reason to use a virtual machine as a sandbox because it allows the technician to test and evaluate new software, updates, or patches in a controlled and isolated environment before deploying it to the production system.

B. To increase the efficient use of computing resources: Virtualization can help to increase the efficient use of computing resources, but this is not the main reason to use a virtual machine as a sandbox. C. To run multiple machines on the same hardware: Virtualization allows to run multiple machines on the same hardware, but this is not the main reason to use a virtual machine as a sandbox. D. To have dedicated hardware for a single system: Virtualization allows to have dedicated hardware for a single system, but this is not the main reason to use a virtual machine as a sandbox.

A user visits the desk to report that a smartphone takes more than a day to fully charge. The user has already tested multiple wall outlets and swapped the charging cable, but the results are the same. Which of the following should the technician do FIRST?

• A. Verify the power rating of the charger.

• B. Ensure all unnecessary connectivity features are disabled.

• C. Check that all missing smartphone OS updates are applied.

• D. Complete a factory reset of the phone

Answer explanation

A. Verify the power rating of the charger

The first step the technician should take is to verify the power rating of the charger. This will help ensure that the charger is providing enough power to the phone to charge it properly. If the charger has a lower power rating than required, it may not be able to charge the phone quickly enough. It's important to use a charger that meets the phone's specifications, different chargers have different power ratings.

B. Ensure all unnecessary connectivity features are disabled: This step is important to conserve battery life, but it's not the first step that should be done. C. Check that all missing smartphone OS updates are applied: Updating the OS could help with some issues, but not related to charging the phone. D. Complete a factory reset of the phone: Doing a factory reset could help with some issues, but it's not the first step that should be done, it's better to first verify the power rating of the charger.

In which of the following places is a laptop's wireless antenna MOST likely located?

• A. Near the network interface card

• B. Underneath the battery

• C. Integrated into the motherboard

• D. In the bezel of the lid

Answer explanation

D. In the bezel of the lid

A laptop's wireless antenna is most likely located in the bezel of the lid. This is the most common location for the wireless antenna as it provides the best location for the wireless signal to be broadcasted and received. The bezel of the lid is the area surrounding the screen and it's usually made of a plastic or metal material, which makes it a good place to install the antenna.

A. Near the network interface card: It's where the wireless card is located, but the antenna is not placed near the network interface card. B. Underneath the battery: The battery is located in the bottom of the laptop, which is not a good place for the wireless antenna. C. Integrated into the motherboard: The wireless antenna could be integrated into the motherboard, but it's not the most common place to locate it.

A network administrator was notified that laptop users are unable to access or ping any network resources on the corporate network. Which of the following should the network administrator check FIRST?

• A. DHCP

• B. AAA

• C. DHB

• D. ARP

Answer explanation

A. DHCP

The first step the network administrator should take is to check the DHCP (Dynamic Host Configuration Protocol) server. DHCP is responsible for assigning IP addresses to devices on the network, and if the DHCP server is down or not functioning properly, devices may not be able to access network resources. By checking the DHCP server, the administrator will be able to determine if this is the root cause of the problem and take appropriate action.

B. AAA (Authentication, Authorization, and Accounting) is used to control access to network resources and to track user activity, but it's not related to the users not being able to access or ping any network resources. C. DHCP and DHCPv6 (DHCPv6) are related but DHCPv6 is used for IPv6 addressing and it's not the first step that should be taken. D. ARP (Address Resolution Protocol) is used to map a network address to a physical (MAC) address, but it's not the first step that should be taken if the laptop users are unable to access or ping any network resources.

Recently, an organization received a number of spam emails that passed through the spam gateway. The emails contained generally the same information, but the sending domains were different. Which of the following solutions would BEST help mitigate the issue?

• A. Updating the keyword filtering

• B. Editing the sender policy framework

• C. Contacting the gateway vendor

• D. Verifying DMARC is enabled

Answer explanation

D. Verifying DMARC is enabled

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol that allows an email domain owner to publish a policy in their DNS records that specifies which mechanisms are used to authenticate email messages sent from their domain. By enabling DMARC, the organization can ensure that the emails that are being sent from their domain are coming from a legitimate source and not from a spammer using a different domain. Verifying that DMARC is enabled is the best solution to mitigate the issue of spam emails passing through the spam gateway.

A. Updating the keyword filtering: This could help with some spam emails, but not all of them. B. Editing the sender policy framework (SPF): SPF is an email validation system, it's used to verify the sender of an email message and it's related to DMARC, but it's not the best solution to mitigate the issue of spam emails passing through the spam gateway. C. Contacting the gateway vendor: The gateway vendor could help with some configuration or software issues, but it's not the best solution to mitigate the issue of spam emails passing through the spam gateway.

A technician is monitoring all outbound traffic in a SOHO. Which of the following is the MOST costeffective solution to monitor the traffic?

• A. Spectrum analyzer

• B. Network tap

• C. Lookback plug

• D. Toner probe

Answer explanation

B. Network tap

A network tap is a device that can be used to monitor outbound traffic in a SOHO. A network tap allows the technician to passively monitor all outbound traffic on the network by creating a copy of the data passing through it. Network taps are cost-effective solution as they don't require any software or configuration, and it can be installed in minutes. It can be placed inline, between the switch and the router or firewall and it can be used to monitor all the traffic passing through the network.

A. Spectrum analyzer: Spectrum analyzer is a device used to measure the power of the electromagnetic signals within a certain frequency range, it's not used to monitor the network traffic. B. Lookback plug: A loopback plug is a device used to test network interfaces by sending data back to the sender, it's not used to monitor the network traffic. C. Toner probe: A toner probe is a device used to identify the physical location of a cable, it's not used to monitor the network traffic.

While implementing a non-carrier-grade wireless backhaul, a technician notices the current channel selection is externally polluted with various RF signals. Upon performing a spectral analysis, the technician discovers a channel containing almost no RF pollution. Unfortunately, the technician is unable to select that channel. Which of the following is the MOST likely reason for this issue?

• A. The channel is reserved for licensed band use.

• B. The channel selection is defective, contact the manufacturer.

• C. The channel must be unblocked by the vendor.

• D. The device requires a firmware update to unlock the channel.

Answer explanation

A. The channel is reserved for licensed band use.

The most likely reason the technician is unable to select a channel with low RF pollution is because it is reserved for licensed band use. Some wireless communication channels are reserved for specific uses such as public safety, military or commercial use, these channels are not available for public use, and therefore the technician will not be able to select them. If a channel is reserved for licensed band use, only users that have a valid license will be able to operate on it, and the technician will not be able to use it for non-carrier-grade wireless backhaul.

B. The channel selection is defective, contact the manufacturer: The channel selection may be defective, but this is not the most likely reason, the technician should check the regulations first. C. The channel must be unblocked by the vendor: It's not a common practice, the technician should check the regulations first. D. The device requires a firmware update to unlock the channel: It's not a common practice, the technician should check the regulations first.

A user submits a help desk ticket regarding a smartphone that will no longer accept its charging cable. The assigned technician notices the phone does not have a protective case, and the user constantly transports the phone in a pocket. The technician attempts to use a secondary charger, but the cable falls out of the phone. Which of the following is the MOST likely cause of the issue?

• A. The phone requires a firmware update to address charging issues.

• B. The charge port contains foreign objects, such as lint.

• C. The phone’s battery has swelled, preventing the utilization of the charge port.

• D. The phone has experienced water damage, thus the battery is not charring.

Answer explanation

B. The charge port contains foreign objects, such as lint.

The fact that the phone no longer accepts its charging cable, and that the cable falls out when using a secondary charger, suggests that the charge port may be obstructed. The fact that the phone does not have a protective case and is frequently transported in a pocket, it may be that the charge port has become clogged with lint, dust or other debris. This could be the most likely cause of the issue. A firmware update or water damage is less likely to cause this issue, however, if the technician suspect that the phone has experienced water damage, he should check for water damage indicator.

A user is trying to play a DVD on a projector. The user can hear the audio; however, the projector is showing an error message that states: HDMI Blocked due to Copy Protection Which of the following is the MOST likely cause of the error?

• A. The HDMI cannot carry the signal from the DVD to the projector.

• B. The user needs to switch from HDMI to a cable standard such as DisplayPort.

• C. The projector does not support the necessary HDCP protocol.

• D. The user needs to enable cony-protected sources in the projector's settings.

Answer explanation

The Official CompTIA® A+® Core 1 and Core 2 Student Guide (Exams 220-1001 and 220-1002) | 193 Protected content. If you encounter an error that indicates unauthorized content or an HDCP error: • DVI, HDMI, DisplayPort, and

Thunderbolt all provide support for the Digital Rights Management (DRM) mechanism High-bandwidth Digital Content Protection (HDCP). HDCP allows a content source (such as a Blu-ray disc) to disable itself if the display adapter and

monitor and/or speaker system do not support HDCP and fail to authenticate themselves with the playback source. There have been various iterations of HDCP (at time of writing the current version is 2.2) and backward-compatibility can be

problematic as authentication may fail between devices that support different versions of the standard.

Vertical streaks are appearing on the output of a laser printer. Which of the following items is the MOST likely cause?

• A. Roller

• B. Drum

• C. Transfer belt

• D. Ribbon

Answer explanation

B. Drum

The laser printer drum is the most likely cause of vertical streaks appearing on the output. The drum is a cylindrical component that holds the toner and is responsible for transferring the toner to the paper. Over time, the drum may become worn or damaged, which can result in vertical streaks appearing on the output. The other components such as roller, transfer belt and ribbon, are not as likely to be the cause of this issue, but it could be also possible that they are worn out or damaged, which can cause similar print quality issues.