CompTIA Updated 220-1201 Exam Questions and Answers by lily-may

Port 23 is used by Telnet, an unencrypted remote connection protocol that poses significant security risks. Disabling Telnet and using secure alternatives like SSH (port 22) is best practice.

From CompTIA A+ 220-1101 Official Study Guide, Objective 2.1 – Common ports and protocols:

"Port 23 (Telnet) provides unencrypted remote access and should be disabled to increase security. Use SSH (port 22) for secure remote connections."

Verified Source:

CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Ports and Protocols

CompTIA Exam Objectives 220-1101, Domain 2.1

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

A hypervisor is software or firmware that allows multiple operating systems (virtual machines) to run on a single physical host. It manages the allocation of resources and isolation of each VM.

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

“A hypervisor is the key component of virtualization, enabling a physical server to host multiple virtual machines (VMs), each with its own OS and resources.”

Verified Source:

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

CompTIA Exam Objectives 220-1101, Domain 3.7

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

If a laptop shuts down when undocked and remains powered off even with a new charging cable, the internal battery is likely faulty and cannot hold a charge. Replacing the battery is the next troubleshooting step.

From the CompTIA A+ 220-1101 Official Study Guide, Objective 4.1 – Troubleshoot common hardware problems:

"If a laptop only works when docked or connected to AC power, and a replacement cable does not resolve the issue, the internal battery may need to be replaced."

Verified Source:

CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 4: Troubleshooting Mobile Devices

CompTIA Exam Objectives 220-1101, Domain 4.1

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

Comprehensive and Detailed Explanation From Exact Extract:

RAID 6 uses two parity blocks, allowing it to tolerate the failure of two drives without losing data.