Unmanaged switches require no configuration they simply need to be plugged in and start working immediately, making them ideal for simple network setups.
Managed switches provide advanced features such as VLANs, SNMP monitoring, port security, and traffic management, but require configuration.
From CompTIA A+ 220-1101 Official Study Guide, Objective 2.2 - Compare and contrast common networking hardware:
"Unmanaged switches operate out of the box with no configuration and are designed for simple connectivity.
Managed switches allow for configuration, monitoring, and management of network traffic and security." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Networking Hardware CompTIA Exam Objectives 220-1101, Domain 2.2

Infrastructure as a Service (IaaS) provides the foundational computing components: virtualized hardware, storage, networking, and hypervisor resources. CompTIA A+ explains that customers using IaaS are responsible for installing and maintaining:
* The operating system
* Applications
* Patches, updates, and configurations
This model gives organizations maximum flexibility because they can build custom server environments without purchasing physical hardware.
In contrast:
* SaaS (A) provides fully managed applications-users do not manage OS or software.
* PaaS (B) provides a development platform and tools but does not allow OS management.
* XaaS (D) is a broad term meaning "anything as a service," not a specific model.
Thus, IaaS is the only model where OS-level control remains with the customer.

Firewalls are specifically designed to monitor, filter, and control network traffic using Access Control Lists (ACLs). ACLs define which traffic is allowed or denied based on parameters like IP address, protocol, or port.
From CompTIA A+ 220-1101 Official Study Guide, Objective 2.2 - Networking hardware and security:
"Firewalls use access control lists (ACLs) to allow or deny traffic based on rules. Unmanaged switches and PoE injectors do not support ACLs." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Networking Security Devices CompTIA Exam Objectives 220-1101, Domain 2.2

Containers provide lightweight virtualization, ideal for deploying microservices because they are isolated, portable, and require fewer resources than traditional VMs.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.7 - Virtualization and cloud computing:
"Containers package applications and their dependencies, making them ideal for running microservices efficiently and independently." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Cloud and Virtualization CompTIA Exam Objectives 220-1101, Domain 3.7

If two devices have thesame static IP address, anIP conflictoccurs. This results in both devices being intermittently disconnected or unable to communicate on the network. It's a common mistake when copying configurations manually.
Option B:DNS conflicts wouldn't cause total disconnection and wouldn't occur just from copying IP settings.
Option C:A cable issue would only affect one workstation.
Option D:Switchport security issues wouldn't affect both machines simultaneously unless port security was configured very specifically.
CompTIA A+ Core 1 Exam Objective Reference:
Objective 2.6: Given a scenario, configure and troubleshoot network connectivity.