A+ 1101 PM Review Day 8

Both Apple and Samsung have released their own versions of contactless mobile payment solutions. For example, Apple Pay allows users to place their iPhone or Apple Watch within an inch of a credit card machine at a store to make a payment. Which of the following wireless technologies do these types of payment systems rely upon?

• Wi-Fi
• Infrared
• Bluetooth
• NFC

Answer explanation

NFC, or near-field communication, is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm of each other. This is commonly used for contactless payment systems, transferring contacts, or transferring a file from one device to another.

You are connecting a laptop to a brand-new digital high-definition TV. Unfortunately, the laptop is a little outdated and only has an analog display output. Which of the following adapters could you use to convert the signal from analog to digital for use with the new television?

• RJ-45 to RJ-11
• HDMI to VGA
• VGA to DVI-D
• DVI-D to HDMI

Answer explanation

To convert from analog to digital, you need a VGA (analog) to DVI-D (digital) adapter.

What RAID level requires at least three hard disks to operate?

• RAID 10
• RAID 1
• RAID 0
• RAID 5

Answer explanation

RAID 5 uses block-level striping with distributed parity, requiring at least three disks to ensure redundancy

Which of the following is an example of a valid IPv4 address?

• ::1
• 192.168.1.254
• 00:AB:FA:B1:07:34
• 192:168:1:55

Answer explanation

An IPv4 address is written in dotted decimal notation, such as 192.168.1.254.

A workstation shows a "bootable device not found" error, and the hard drive is not recognized in UEFI. What is the likely cause?

• Boot order is incorrect
• Workstation is overheating
• Mixed DDR3 and DDR4 modules
• Hard drive failure

Answer explanation

If properly cabled but unrecognized, the hard drive has likely failed.

Which of the following is the MOST dangerous type of threat when using virtualization?

• VM escape
• VM sprawl
• Rogue VM
• Virtual NIC duplication

Answer explanation

VM escape is the biggest threat in virtualized systems, where malware on a guest OS can jump to another guest or the host. Keeping hypervisor code up-to-date is essential to mitigate this risk. Other issues like VM sprawl and rogue VMs are less critical.

WolfTech utilizes a strong authentication model for all of its internal services. If an employee needs to access one of the company's internal applications, they use their username, a password, and a one-time code texted to their smartphone to log in. Which of the following types of authentication is this known as?

• SSO
• TouchID
• FaceID
• MFA

Answer explanation

Multifactor Authentication (MFA) combines at least two factors: something you know (password) and something you have (one-time code).

During a disaster recovery, which of the following statements is true?

• Both a virtual machine and a physical server have the same downtime
• A virtual machine cannot be used for redundancy or load balancing
• A virtual machine has more downtime than a physical server
• A virtual machine has less downtime than a physical server

Answer explanation

Virtual machines can be restored much faster than physical servers, which require hardware replacement and driver configuration. Virtual machines can be recreated using backups, instances, or clones, leading to lower downtime compared to physical servers.

A printer user complains of non-functionality. You ask follow-up questions about error messages. What troubleshooting step is this?

• Identify the problem
• Test the theory to determine the cause
• Verify full system functionality
• Establish a plan of action

Answer explanation

Gathering details from the user is part of identifying the problem.

Which of the following devices should be installed as an intermediary between your clients and the web servers they want to connect to make an HTTP request from the client, check it, and then forward it to its destination?

• DHCP server
• DNS server
• File server
• Proxy server

Answer explanation

Proxy servers act as intermediaries, forwarding client HTTP requests to their destinations and filtering responses.