A firewall implements ACLs (Access Control Lists) to filter traffic and enforce policies based on rules such as IP address, port, or protocol.
* Why Not A (Managed switch): A managed switch supports VLANs and QoS but does not enforce ACLs at the network perimeter.
* Why Not B (Gateway): Gateways connect networks and translate protocols but don't typically implement ACLs.
* Why Not C (Repeater): Repeaters extend signal range but don't enforce policies.
CompTIA A+ Exam Reference: Core 1 (220-1101), Section 2.2, firewall concepts.

In this situation, the best course of action for the technician to take NEXT would be C. Verify the socket type and manufacturer. If the pins on the CPU do not line up with the socket on the motherboard, it is likely that there is a compatibility issue between the two components. The technician should verify that the socket type and manufacturer of the motherboard match those of the CPU to ensure that they are compatible.

After resolving the immediate issue (reactivating server credentials), verifying system functionality ensures the solution works as intended and the user can now access the shared drive. This step is a part of the CompTIA troubleshooting methodology:
* Identify the problem.
* Establish a theory of probable cause.
* Test the theory to determine the cause.
* Establish a plan of action.
* Implement the solution.
* Verify full system functionality.
* Document findings, actions, and outcomes.
* Why Not B (Document the findings): Documentation comes after verifying the system works.
* Why Not A (Escalate the issue): Escalation is unnecessary since the problem was resolved.
* Why Not C (Perform backups): Performing backups is unrelated to verifying credential functionality.
CompTIA A+ Exam Reference: Core 2 (220-1102), Section 3.1, troubleshooting methodology.

The unexpected reboots on a graphics workstation when rendering complex 3-D models may be caused by insufficient power supply. The workstation is configured with a 115V power supply that is rated at 200W, which may not be enough when the GPU is heavily tasked. The technician should begin troubleshooting by checking the power supply.

The concept described in the question is related to virtualization and resource management in a virtual environment. The approach that allows all virtual machines (VMs) to have memory (RAM) allocated for use is known as resource pooling. Therefore, the correct answer is D: "Resource pooling." This approach allows resources to be allocated dynamically to VMs based on their current needs, and ensures that resources are used efficiently in the virtual environment.
Resource pooling is a technique used in virtualization to share resources among multiple virtual machines (VMs). With resource pooling, RAM can be allocated dynamically to VMs as needed, allowing all VMs in a virtual environment to have RAM allocated for use.
References: https://en.wikipedia.org/wiki/Resource_pooling