XK0-006 Zertifizierungsfragen, XK0-006 Zertifizierungsantworten

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CompTIA XK0-006 Prüfungsplan:

ThemaEinzelheiten
Thema 1
  • Automation, Orchestration, and Scripting: Covers task automation with tools like Ansible, shell and Python scripting, Git version control, and responsible AI-assisted development.
Thema 2
  • Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
Thema 3
  • Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.
Thema 4
  • Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.

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XK0-006 Zertifizierungsantworten - XK0-006 Testantworten

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CompTIA Linux+ Certification Exam XK0-006 Prüfungsfragen mit Lösungen (Q196-Q201):

196. Frage
A systems administrator needs to set the IP address of a new DNS server. Which of the following files should the administrator modify to complete this task?

Antwort: B

Begründung:
The /etc/resolv.conf file defines DNS resolver settings, including the IP addresses of DNS servers that the system should use for hostname resolution.


197. Frage
A Linux administrator wants to make the enable_auth variable set to 1 and available to the environment of subsequently executed commands. Which of the following should the administrator use for this task?

Antwort: B

Begründung:
Environment variables in Linux can exist either locally within a shell or be exported to child processes.
CompTIA Linux+ V8 emphasizes the distinction between shell variables and environment variables, as this affects how applications inherit configuration values.
Option D, export ENABLE_AUTH=1, is the correct choice because it both assigns the variable and marks it for export to the environment. Once exported, the variable becomes available to all subsequently executed commands and child processes spawned from the current shell. This behavior is required when applications or scripts rely on environment variables for configuration.
Option B, ENABLE_AUTH=1, only sets a shell-local variable. While it is accessible within the current shell session, it is not inherited by child processes unless explicitly exported. Option A, let ENABLE_AUTH=1, performs arithmetic evaluation and does not export the variable. Option C incorrectly assigns the output of a command substitution and does not set the desired value.
Linux+ V8 documentation highlights export as the correct mechanism for making variables available system- wide within a user session. Therefore, the correct answer is D.


198. Frage
A Linux administrator is testing a web application on a laboratory service and needs to temporarily allow DNS and HTTP/HTTPS traffic from the internal network. Which of the following commands will accomplish this task?

Antwort: C

Begründung:
The correct way to temporarily allow specific services in a particular zone with firewalld is to use firewall-cmd --add-service=service --zone=zone. Multiple services can be specified in curly braces and separated by commas. The correct syntax is:
bash
CopyEdit
firewall-cmd --add-service={dns,http,https} --zone=internal
This command will allow DNS (port 53), HTTP (port 80), and HTTPS (port 443) through the firewall for the "internal" zone temporarily (for the current runtime session).


199. Frage
A systems administrator is having issues with a third-party API endpoint. The administrator receives the following output:

Which of the following actions should the administrator take to resolve the issue?

Antwort: C

Begründung:
This scenario represents a name resolution failure, which is a common troubleshooting case addressed in CompTIA Linux+ V8. The critical clues are the error messages returned by both curl and dig.
The curl error "Could not resolve host" indicates that the system is unable to translate the hostname into an IP address. This is confirmed by the dig output, which returns NXDOMAIN, meaning the DNS resolver cannot resolve the requested domain name. Importantly, the dig output shows that the query is reaching a DNS server (10.255.255.254), but the resolution fails, strongly pointing to a DNS client configuration issue.
Option C, reviewing and fixing the DNS client configuration file (such as /etc/resolv.conf or systemd-resolved settings), is the correct action. Linux+ V8 documentation highlights DNS misconfiguration as a primary cause of application connectivity issues. Incorrect nameserver entries, unreachable DNS servers, or misconfigured resolvers commonly produce NXDOMAIN responses.
The other options are incorrect. Firewall issues would result in connection timeouts, not DNS resolution failures. Requesting a new API endpoint is unnecessary without first confirming local DNS functionality.
Internet connectivity issues would typically prevent any DNS communication, but here a DNS server is clearly being contacted.
Linux+ V8 stresses a layered troubleshooting approach: verify DNS resolution before investigating network ports or application logic. Therefore, the correct answer is C. Review and fix the DNS client configuration file.


200. Frage
Which of the following protocols is used to monitor network devices?

Antwort: A

Begründung:
SNMP is used to monitor network devices by collecting status and performance information and allowing centralized management and alerting.


201. Frage
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