Explanation
Domain Name System (DNS) is an Internet service that translates domain names (e.g., its.umich.edu) into IP addresses. Dynamic Host Configuration Protocol (DHCP) is a protocol for automatically assigning IP addresses and other configurations to devices when they connect to a network.

Explanation
A sandbox is a virtual environment that isolates the engineer's research activities from the rest of the system.
This allows the engineer to test, experiment, and modify the system without affecting the real data, applications, or settings. A sandbox is the best environment for research purposes because it provides a safe and controlled way to explore new ideas, simulate scenarios, and troubleshoot problems. A sandbox can also be easily reset or deleted after the research is done.
References
What is a Sandbox Environment?
Chapter 4: Virtualization and Cloud Computing

The error message "Reboot and Select Proper Boot Device" indicates that the computer cannot find the boot device that contains the operating system12. This can happen if the hard drive that stores the operating system is damaged or failed, and the BIOS cannot detect it or read from it23. A failed hard drive can also cause other symptoms such as clicking noises, corrupted files, or slow performance4.

Liquid cooling is an effective solution for managing the high heat output that can result from overclocking a GPU. It's more efficient than air cooling methods (like larger heat sinks or fan upgrades) and can better maintain lower temperatures under load, reducing the risk of overheating.
Reference:
CompTIA A+ Core 1 Exam Objectives Section 3.4: Given a scenario, install and configure motherboards, CPUs, and add-on cards.
These answers align with the CompTIA A+ certification objectives and are derived from the official CompTIA A+ Core 1 (220-1101) and Core 2 (220-1102) Exam Objectives documents.