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

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.

NFC (Near-Field Communication)operates atvery short ranges usually less than 4cm, and is ideal for quick, secure transactions like contactless payments.Bluetoothsupportslonger ranges (up to 10 meters or 32 feet)and is suited for ongoing connections like wireless headsets or file transfers.
Option A:Bluetooth is faster for large file transfers.
Option B:NFC usesless power, not more.
Option C:NFC doesnotrequire pairing Bluetooth does.
CompTIA A+ Core 1 Exam Objective Reference:
Objective 1.5: Given a scenario, connect and configure accessories and ports of mobile devices.

A punchdown tool is specifically used to insert wires into a punchdown block in patch panels, which is typical for Cat 6 and similar cabling. It ensures a secure and correct connection by pushing the wire into a metal groove that slices the insulation.

ECC (Error-Correcting Code) RAM is commonly used in servers because it can detect and correct memory errors, providing greater stability and reliability for mission-critical environments.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.2 - Types of RAM:
"Servers often require ECC memory, which can detect and correct single-bit errors, preventing data corruption and increasing system reliability." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Memory Technologies CompTIA Exam Objectives 220-1101, Domain 3.2