A PoE (Power over Ethernet) switch transmits both data and electrical power over Ethernet cables to devices like wireless access points or VoIP phones. This is especially useful in areas where separate power sources are not available.
Reference: "CompTIA A+ Complete Study Guide" by Quentin Docter - Chapter 5, pages 319-321.

Assigning a static IP to network printers ensures the printer's address does not change after outages or DHCP lease expirations, preventing connectivity issues.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.4 - Printer network configuration:
"Printers should use static IPs to ensure they remain reachable and do not change addresses after network events." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Printer Networking CompTIA Exam Objectives 220-1101, Domain 3.4

An MX (Mail Exchange) record specifies the mail server responsible for receiving email for a domain.
Why Not A (CNAME): CNAME is used for domain aliasing, not for email delivery.
Why Not B (SRV): SRV records are used to locate specific services, not mail servers.
Why Not D (SOA): SOA records provide domain information but do not handle email.
CompTIA A+ Exam Reference: Core 1 (220-1201), Section 2.6, DNS record types.

In CompTIA A+ Core 1 (220-1201) cloud concepts, the key differentiator between cloud deployment models is where the service is hosted and who owns/uses the underlying infrastructure. If a company's directory services server (for example, a domain controller providing authentication/authorization and centralized identity management) is located on premises, that points to infrastructure that is owned and operated by the organization for its own internal use. This aligns best with a private cloud model, which is defined as cloud resources dedicated to a single organization and can be implemented on-premises (internally hosted) or in a dedicated off-site environment.
It is not a public cloud because public cloud services are hosted by a third-party provider and shared across multiple customers. It is not hybrid cloud because hybrid requires a mix of on-prem resources and public cloud resources working together (the question only specifies on-prem). It is not community cloud because that involves shared infrastructure among multiple organizations with common needs.

A VLAN (Virtual Local Area Network) segments a physical network into separate logical networks, enhancing security by isolating traffic.
Why Not A (Minimizes collision domains): VLANs manage broadcast domains, not collision domains.
Why Not B (Provides private access to cloud resources): VLANs operate within a local network, not cloud- specific.
Why Not C (Increases network address space): VLANs do not affect address space.
CompTIA A+ Exam Reference: Core 1 (220-1201), Section 2.6, VLAN concepts.