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

============

A sandbox is an isolated virtual environment, often used for testing code or software safely without affecting the host system.

From CompTIA A+ 220-1101 Official Study Guide, Objective 3.7 – Virtualization:

“A sandbox provides an isolated environment, often implemented as a virtual machine, to safely test applications or code.”

Verified Source:

CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Virtualization

CompTIA Exam Objectives 220-1101, Domain 3.7

============

The degraded status on Server 2 indicates a RAID-5 issue, typically due to a failed or failing drive. In RAID-5 configurations, when one drive fails, the system can still operate but with reduced performance as parity data is used to rebuild missing data on-the-fly.

Recommended Replacement Drive:

To minimize performance degradation, the replacement drive should be:

SAS HDD with the same specifications (64KB stripe size, no read-ahead, and write-back policy).

Matching the configuration exactly ensures seamless integration and optimizes recovery speed in the RAID-5 array.

In RAID-5, degraded performance is expected when one drive fails, as parity data needs to rebuild missing information during each read/write process. Replacing the failed drive restores the RAID array to optimal status, reducing the load on existing drives and returning the system to normal read/write performance. The write-back policy and disabled disk cache settings are designed to reduce latency and increase efficiency, essential for handling real-time applications.

A user reports poor performance on the

application server.

INSTRUCTIONS

Click on Server 1 and Server 2 and review

the information presented in each chart to

determine which drives need to be replaced.

Select the appropriate replacement drive

that should be used, for the least

performance degradation to the server.

A computer server with many black and silver parts AI-generated content may be incorrect.A computer server with many black boxes Description automatically generated with medium confidence

A screen shot of a computer AI-generated content may be incorrect.A screen shot of a computer Description automatically generated

A computer screen shot of a computer AI-generated content may be incorrect.A computer screen shot of a computer Description automatically generated

A computer screen shot of a computer AI-generated content may be incorrect.A computer screen shot of a computer Description automatically generated

A computer screen shot of a computer AI-generated content may be incorrect.A computer screen shot of a computer Description automatically generated

A screenshot of a computer AI-generated content may be incorrect.A screenshot of a computer Description automatically generated

A screenshot of a computer AI-generated content may be incorrect.A screenshot of a computer Description automatically generated

PoE (Power over Ethernet) allows both data and electrical power to be delivered over the same Ethernet cable. A PoE injector adds power to Ethernet cables for devices that need it.

From CompTIA A+ 220-1101 Official Study Guide, Objective 2.2 – Networking hardware:

“Power over Ethernet (PoE) technology and PoE injectors enable both power and data transmission to compatible network devices like access points and IP cameras.”

Verified Source:

CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Network Hardware

CompTIA Exam Objectives 220-1101, Domain 2.2

============

Comprehensive and Detailed Step-by-Step Explanation:

LC Connector (Lucent Connector):

LC is a type of fiber optic connector commonly used in optical networking cables. It is small, compact, and widely used for high-speed data transfer over fiber optic networks.

LC connectors are specifically designed for fiber optic cables, making them the correct answer.

Incorrect Options:

A. RJ45: RJ45 connectors are used for Ethernet cables (twisted-pair copper cabling) and are not compatible with optical networking cables.

C. USB-C: USB-C is a connector type used for general-purpose data transfer, charging, and video output, not for optical networking.

D. Lightning: Lightning connectors are proprietary to Apple devices and are not used in optical networking.

Key Takeaway:

The LC connector is specifically designed for fiber optic cables, making it the correct answer for optical networking.

Elasticity in cloud computing refers to the ability of a system to automatically allocate and release resources (such as CPU, RAM, or virtual machines) as workload demands change. This feature is key to ensuring that resources are used efficiently without manual intervention.

An eSIM (embedded SIM) allows users to change carriers and provision new cellular service without installing any physical hardware. It is managed via software and is ideal for international travelers who need to switch providers quickly.

From the CompTIA A+ 220-1101 Official Study Guide, Objective 3.3 – Install and configure mobile device network connectivity:

"eSIMs provide carrier flexibility by enabling remote provisioning and profile switching, making it possible to connect to different networks without a physical SIM card."

Verified Source:

CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Mobile Devices

CompTIA Exam Objectives 220-1101, Domain 3.3