220-1101 CompTIA Exam Lab Questions

DKIM (DomainKeys Identified Mail) is an email authentication method that attaches a digital signature to outgoing emails to verify the email’s authenticity and detect email spoofing.

SPF (Sender Policy Framework): Specifies which mail servers are authorized to send emails for a domain but does not involve digital signatures.

DNS Pointer (PTR): Used for reverse DNS lookups, not email authentication.

MX Records: Specify mail servers for email delivery but do not authenticate emails.

CompTIA A+ Exam Reference: Core 2 (220-1102), Section 2.4, email security and authentication​.

A sandbox is a virtualization solution that allows a legacy application to run in an isolated environment without affecting other applications or systems. A sandbox can emulate an older operating system or hardware configuration that is compatible with the legacy software. A hybrid cloud is a combination of public and private cloud services that share data and resources. Infrastructure as a service is a cloud computing model that provides servers, storage, networking, and software over the internet. Public cloud is a cloud computing model that provides services and resources to anyone over the internet. Private cloud is a cloud computing model that provides services and resources to a specific organization or group over a private network. 

One of the possible causes of random and incorrect characters appearing on print jobs sent to a laser printer is an outdated or corrupted driver. The driver is a software component that communicates between the operating system and the printer, and converts data into a format that the printer can understand. If the driver is outdated or corrupted, it may send incorrect or garbled data to the printer, resulting in poor print quality or errors. The technician should update the driver to the latest version from the manufacturer’s website, or uninstall and reinstall it if necessary. Reference: ia.org/training/books/a-core-1-220-1101-study-guide (page 47)

Quad-channel memory architecture allows the CPU to access four memory modules simultaneously, increasing the memory bandwidth and performance. DDR4 RAM is a type of memory that has higher speed and lower power consumption than DDR3. SODIMM is a smaller form factor of memory that is typically used in laptops, not desktops. ECC RAM is a type of memory that can detect and correct errors, but it is more expensive and slower than non-ECC RAM. Triple-channel memory architecture is less common and less efficient than quad-channel. References: