A+ 1101 PM A 67 - 90

A system administrator has received a report of customers receiving  email messages from the company, but upon further analysis the administrator finds the messages were not actually sent by the corporation. Which of the following should be implemented to  prevent these spoofed email messages?

• Add multi-factor authentication to all email logins

• Change the passwords on all email accounts

• Configure an SPF record in the DNS

• Modify the firewall rules to prevent outgoing emails

Answer explanation

The Answer: C. Configure an SPF record in the DNS

An SPF (Sender Policy Framework) record in the DNS (Domain Name System) server provides a list of all servers authorized to send emails for a domain. Any emails not originating from an authorized source can be dismissed as unauthorized or invalid.

The incorrect answers:

A.  Add multi-factor authentication to all email logins

The spoofed email messages did not originate from the corporate network, so modifying the authentication process would not prevent customers from receiving spoofed email messages.

B.  Change the passwords on all email accounts

Since the email messages did not originate from a corporate account, changing the passwords would not prevent the spoofed emails.

D. Modify the firewall rules to prevent outgoing emails

The spoofed email messages were sent from a different network, so modifying the corporate firewall would not block any email spoofing.

More information:

220-1101, Objective 2.6 - DNS Configuration https://professormesser.link/1101020601

A system administrator has configured a VM for dual processors, 16 GB of RAM, and 120 GB of disk space. Which of the following is required to start this VM?

• Shared network address

• Hypervisor

• Virtual switch

• Video display

Answer explanation

The Answer: B. Hypervisor

A hypervisor, or virtual machine manager, is the software that manages the virtual platform and guest operating systems.

The incorrect answers:

A. Shared network address

There are many options for a virtual machine, including shared, bridged, and private network addresses. A shared network address is not required to start a virtual machine.

C.  Virtual switch

Like physical switches, virtual switches can be used to provide connectivity and segmentation for virtual machines. A virtual switch is not a

requirement to start or use a virtual machine

D.  Video display

Many servers operate without a video display, mouse, or keyboard. These systems are "headless," and a video display is not required to start a virtual machine.

More information:

220-1101, Objective 4.2 - Client-side Virtualization https://professormesser.link/1101040201

A site manager has noticed her smartphone has a short battery life when used at work, and the battery life is normal when working from home. The work location has limited mobile service reception, but most office services are provided over the local 802.11 Wi-Fi network. The site manager does not enable Bluetooth on her smartphone. Which of the following would be the BEST way to extend the battery life of her  mobile device?

• Disable 802.11 Wi-Fi

• Disable the cellular radio at work

• Replace the battery

• Enable Bluetooth on the mobile device

Answer explanation

The Answer: B. Disable the cellular radio at work

When a mobile provider's network isn't available, a phone will constantly try to find and reconnect to a cellular network. This reconnection process constantly uses the radio, and subsequently more of the battery is used in the process. To conserve battery life, it would be useful to disable the cellular network connection when outside of a coverage area.

The incorrect answers:

A. Disable 802.11 Wi-Fi

The Wi-Fi network is used at work for office services, so disabling Wi-Fi is not a good option. Since Wi-Fi does not require a constant connection, it's unlikely that the battery usage is associated with the Wi-Fi radio.

C.   Replace the battery

It's possible that the battery in the mobile device could need replacing, but the battery problem doesn't appear to happen while at home. If the battery was the primary issue, the battery would work just as poorly at home as the office.

D.   Enable Bluetooth on the mobile device

Enabling a feature like the Bluetooth radio would increase battery usage. If the battery is the biggest concern and no Bluetooth features are in use, it's a better idea to keep Bluetooth disabled.

More information:

220-1101, Objective 5.5 - Troubleshooting Mobile Devices https://professormesser.link/1101050501

A desktop computer has just abruptly shut off, and pressing the power button doesn’t restart the system. There are no fans spinning, no lights are on, and no messages appear on the display. Which of these would be the MOST likely cause of this issue?

• The BIOS is configured with a startup password

• The LCD display backlight has failed

• The power supply is faulty

• The master boot record is corrupted

• The boot sector is missing

Answer explanation

The Answer: C. The power supply is faulty

A faulty power supply could cause a loss of power across all computer systems, and the lack of fans, lights, and output on the display would be the most likely cause given the available options.

The incorrect answers:

A. The BIOS is configured with a startup password

A startup password would not cause the system to power down, and the password prompt would be presented if the computer was powering on.

B. The LCD display backlight has failed

A failure of the LCD backlight would make it appear the screen is not working, but the fans and lights would still be working normally.

D. The master boot record is corrupted

A corrupted master boot record may prevent a system from booting, but the fans, lights, and screen output would still be working properly.

E. The boot sector is missing

A missing boot sector would not prevent the fans and lights from working properly. The screen would commonly show an error explaining that an operating system was not able to properly start.

More information:

220-1101, Objective 5.2

Troubleshooting Common Hardware Problems https://professormesser.link/1101050201

What kind of device is commonly used to filter traffic based on a predefined set of rules?

• PoE switch

• Repeater

• DSL modem

• Firewall

Answer explanation

The Answer: D. Firewall

A firewall is designed to evaluate inbound traffic, compare that traffic to predefined security policies, and allow or block that traffic from passing through the firewall. Firewalls are common security appliances between an organization's internal network and the Internet.

The incorrect answers:

A.  PoE Switch

PoE (Power over Ethernet) switches are used to provide power to Ethernet-connected devices. This allows devices such as access points, security cameras, and VoIP phones to connect with a single Ethernet link for both data connectivity and device power.

B.  Repeater

Repeaters are relatively simple devices. Repeaters receive a signal, regenerate that signal, and then resend that signal to another network connection. Repeaters do not make any forwarding decisions and they don't filter based on a set of rules.

C.  DSL modem

DSL (Digital Subscriber Line) is a common Internet connection technology provided over the same twisted pair copper used by analog telephone services. A DSL modem allows the end-user to connect their existing network to the DSL network, but the DSL modem does not filter traffic based on a set of access rules.

More information:

220-1101, Objective 2.2 - Network Devices https://professormesser.link/1101020201

Which of these connection types use coax to provide Internet data, voice, and video over the same wire?

• DSL

• Cable broadband

• ONT

• PoE

Answer explanation

The Answer: B. Cable broadband

Cable television brought video into everyone's home, and now voice and Internet services are included on the same coax cable.

The incorrect answers:

A. DSL

DSL (Digital Subscriber Line) uses a pair of copper wires to provide Internet access over the same connection as a traditional telephone service.

C.   ONT

An ONT (Optical Network Terminal) is a demarcation point commonly used for fiber to the premises. Although the ONT may include a coax connection for television, it does not commonly combine voice, video, and Internet over coax.

D.   PoE

PoE (Power over Ethernet) is a convenient way to provide a power source for a device without connecting to a power outlet. PoE does not provide any consolidation of services over coax cable, however.

More information:

220-1101, Objective 2.7 - Internet Connection Types https://professormesser.link/1101020701

A desktop administrator has been asked to troubleshoot a laptop  computer that beeps during the power on process while the laptop screen remains dark. Which of the following would be the best NEXT troubleshooting step?

• Implement a solution

• Document findings

• Establish a theory

• Evaluate results

Answer explanation

The Answer: C. Establish a theory

Once an issue has been identified, it's important to consider all of the possible reasons the problem may have occurred. It's useful to list all possible causes, even those that might not be obvious.

The incorrect answers:

A.  Implement a solution

The implementation of a solution would occur after possible theories have been determined and tested. Once a plan of action is created, the solution can be implemented.

B.  Document findings

Once the problem has been resolved, the last step of the troubleshooting process is to document the issue, the resolution, and any other important steps during the process.

D. Evaluate results

When testing theories for possible fixes, the results of each test should be evaluated to determine if the fix was successful.

More information:

220-1101, Objective 5.1 - How to Troubleshoot https://professormesser.link/1101050101

A user is pairing a Bluetooth headset to their smartphone. What type of security is used during the pairing process to authorize this connection?

• 802.1X

• Client certificate

• Pre-shared key

• PIN

• Username and password

Answer explanation

The Answer: D. PIN

A PIN (Personal Identification Number) is used to validate the device connecting during the Bluetooth pairing process. This authorization prevents a third-party from connecting to a smartphone or tablet without permission.

The incorrect answers:

A.  802.1X

802.1X is a standard for port-based network access control (NAC). This is commonly used for network authentication, but it is not part of the Bluetooth pairing process.

B.  Client certificate

Adding a client certificate to a device can help with an authentication process, but a client certificate is not used when pairing a Bluetooth accessory.

C.  Pre-shared key

A pre-shared key is a passphrase two devices can use to validate the authentication process. These are commonly used with private wireless networks, but they are not part of the Bluetooth pairing process.

E. Username and password

A username and password are some of the most common ways to provide authentication, but the Bluetooth pairing process does not use usernames or passwords.

More information:

220-1101, Objective 1.4 - Mobile Device Connectivity https://professormesser.link/1101010402

A company has designed a platform to scale up when the application use increases during the day, and scale back down at night. Which of the following BEST describes this characteristic of cloud computing?

• Resource pooling

• Measured service

• Hybrid

• Rapid elasticity

Answer explanation

The Answer: D. Rapid elasticity

Scaling up and down as needed is a significant characteristic of cloud computing. This allows organizations to manage and pay for resources when busy, but save time and money when the resources are no longer needed.

The incorrect answers:

A.  Resource pooling

To provide rapid elasticity, there should be plenty of resources available when needed. Resource pooling puts all of the computing power in one place, and portions of the pool can be distributed as-needed.

B.  Measured service

Tracking costs and utilization is useful for tracking and billing, and a measured service provides a way to monitor and view the use of cloudbased resources.

C.  Hybrid

A hybrid cloud model combines both public and private clouds together. The hybrid cloud does not describe the scalability of these cloud deployment models.

More information:

220-1101, Objective 4.1 - Cloud Models https://professormesser.link/1101040101

A user’s tablet has stopped responding to any type of finger input on the screen. The clock and other tablet functions appear to be working. Which of the following would be the BEST way to correct this issue?

• Replace the screen

• Reset the wireless network

• Connect to a power source

• Restart the tablet

Answer explanation

The Answer: D. Restart the tablet

Before making any changes to hardware or software, it's useful to restart the tablet to see if a software glitch may have been the underlying issue.

The incorrect answers:

A.  Replace the screen

Without running additional tests, it's impossible to know if the screen is actually the issue. Before switching out any hardware, it's useful to restart the system and run some hardware diagnostics.

B.  Reset the wireless network

The wireless network would not have any impact on the screen digitizer. If the tablet was experiencing network issues, then resetting the wireless network may resolve any problems.

C.  Connect to a power source

A tablet will continue to provide input to the digitizer, even in situations of low battery life. Connecting to a power source would not be a common solution for this issue.

More information:

220-1101, Objective 5.5 - Troubleshooting Mobile Devices https://professormesser.link/1101050501