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[General] XK0-005試験の準備方法 |実際的なXK0-005日本語関連対策試験 |効果的なCompTIA Linux+ Certification Exam最新知識

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【General】 XK0-005試験の準備方法 |実際的なXK0-005日本語関連対策試験 |効果的なCompTIA Linux+ Certification Exam最新知識

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XK0-005試験は、90分以内に完了する必要がある90の複数選択とパフォーマンスベースの質問で構成されています。試験は、監督済み環境で管理されており、対面またはオンラインのいずれかを採用できます。試験の完了は、候補者がLinuxシステムの構成、管理、トラブルシューティングに必要な知識とスキルを持っていることを示しており、Linuxテクノロジーを利用するあらゆる組織にとって貴重な資産となっています。 Comptia Linux+認定はグローバルに認識されており、IT専門家がLinux管理における専門知識を証明する優れた方法です。
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Comptia XK0-005は、Comptia Linux+認定試験としても知られており、Linuxベースのシステムで知識とスキルを実証することに関心のあるIT専門家向けに設計された認定試験です。この試験では、システムアーキテクチャ、Linuxコマンドライン、ファイルシステムとストレージ、セキュリティ、仮想化、トラブルシューティングなど、幅広いトピックについて説明します。この認定は、Linuxベースのシステムのインストール、構成、管理、およびトラブルシューティングに関連するタスクを実行する候補者の能力を検証します。
CompTIA Linux+ Certification Exam 認定 XK0-005 試験問題 (Q220-Q225):質問 # 220
A Linux administrator needs to expand a volume group using a new disk. Which of the following options presents the correct sequence of commands to accomplish the task?
  • A. partprobevgcreatelvextend
  • B. lvcreatefdiskpartprobe
  • C. fdiskpvcreatevgextend
  • D. fdiskpartprobemkfs
正解：C
解説：
The correct sequence of commands to expand a volume group using a new disk is fdisk, pvcreate, vgextend. The fdisk command can be used to create a partition on the new disk with the type 8e (Linux LVM). The pvcreate command can be used to initialize the partition as a physical volume for LVM. The vgextend command can be used to add the physical volume to an existing volume group. The partprobe command can be used to inform the kernel about partition table changes, but it is not necessary in this case. The vgcreate command can be used to create a new volume group, not expand an existing one. The lvextend command can be used to extend a logical volume, not a volume group. The lvcreate command can be used to create a new logical volume, not expand a volume group. The mkfs command can be used to create a filesystem on a partition or a logical volume, not expand a volume group. Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 14: Managing Disk Storage, pages 462-463.

質問 # 221
A Linux system is having issues. Given the following outputs:
# dig @192.168.2.2 mycomptiahost
; << >> DiG 9.9.4-RedHat-9.9.4-74.el7_6.1 << >> @192.168.2.2 mycomptiahost
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached
# nc -v 192.168.2.2 53
Ncat: Version 7.70 ( https://nmap.org/ncat )
Ncat: Connection timed out.
# ping 192.168.2.2
PING 192.168.2.2 (192.168.2.2) 56(84) bytes of data.
64 bytes from 192.168.2.2: icmp_seq=1 ttl=117 time=4.94 ms
64 bytes from 192.168.2.2: icmp_seq=2 ttl=117 time=10.5 ms
Which of the following best describes this issue?
  • A. The name mycomptiahost does not exist in the DNS.
  • B. The DNS service is currently not available or the corresponding port is blocked.
  • C. The Linux engineer is using the wrong DNS port.
  • D. The DNS host is down.
正解：B
解説：
The ping command shows that the Linux system can reach the DNS server at 192.168.2.2, so the DNS host is not down. The dig and nc commands show that the Linux system cannot connect to the DNS server on port
53, which is the standard port for DNS queries. This means that either the DNS service is not running on the DNS server, or there is a firewall or network device blocking the port 53 traffic. Therefore, the DNS service is currently not available or the corresponding port is blocked.References1: How To Troubleshoot DNS Client Issues in Linux - RootUsers2: 6 Best Tools to Troubleshoot DNS Issues in Linux - Tecmint3: How To Troubleshoot DNS in Linux - OrcaCore4: Fixing DNS Issues in Ubuntu 20.04 | DeviceTests

質問 # 222
A Linux administrator has installed a web server, a database server, and a web application on a server. The web application should be active in order to render the web pages. After the administrator restarts the server, the website displays the following message in the browser: Error establishing a database connection. The Linux administrator reviews the following relevant output from the systemd init files:

The administrator needs to ensure that the database is available before the web application is started. Which of the following should the administrator add to the HTTP server .service file to accomplish this task?
  • A. WANTEDBY=mariadb.service
  • B. REQUIRES=mariadb.service
  • C. TRIGGERS=mariadb.service
  • D. ONFAILURE=mariadb.service
正解：B
解説：
The administrator should add REQUIRES=mariadb.service to the HTTP server .service file to ensure that the database is available before the web application is started. This directive specifies that the HTTP server unit requires the MariaDB server unit to be started before it can run. If the MariaDB server unit fails to start or stops for any reason, the HTTP server unit will also fail or stop. This way, the dependency between the web application and the database is enforced by systemd.
The other options are not correct directives for accomplishing this task. TRIGGERS=mariadb.service is not a valid directive in systemd unit files. ONFAILURE=mariadb.service means that the HTTP server unit will start only if the MariaDB server unit fails, which is not what we want. WANTEDBY=mariadb.service means that the HTTP server unit will be started when the MariaDB server unit is enabled, but it does not imply a strong dependency or ordering relationship between them. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Services with systemd; systemd.unit(5) - Linux manual page

質問 # 223
The security team has identified a web service that is running with elevated privileges A Linux administrator is working to change the systemd service file to meet security compliance standards. Given the following output:

Which of the following remediation steps will prevent the web service from running as a privileged user?
  • A. Changing the:nulti-user.target in the [Install] section to basic.target
  • B. Removing the ExecStarWusr/sbin/webserver -D SOPTIONS from the service file
  • C. Adding the User-webservice to the [Service] section of the service file
  • D. Updating the Environment File line in the [Service] section to/home/webservice/config
正解：C
解説：
The remediation step that will prevent the web service from running as a privileged user is adding the User=webservice to the [Service] section of the service file. The service file is a configuration file that defines the properties and behavior of a systemd service. The systemd is a system and service manager that controls the startup and operation of Linux systems. The service file contains various sections and options that specify how the service should be started, stopped, and managed. The [Service] section defines how the service should be executed and what commands should be run. The User option specifies the user name or ID that the service should run as. The webservice is the name of the user that the administrator wants to run the web service as. The administrator should add the User=webservice to the [Service] section of the service file, which will prevent the web service from running as a privileged user, such as root, and improve the security of the system. This is the correct remediation step to use to prevent the web service from running as a privileged user. The other options are incorrect because they either do not change the user that the service runs as (removing the ExecStart=/usr/sbin/webserver -D OPTIONS from the service file or updating the EnvironmentFile line in the [Service] section to /home/webservice/config) or do not affect the user that the service runs as (changing the multi-user.target in the [Install] section to basic.target). Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 15: Managing System Services, page 458.

質問 # 224
A Linux user wants to give read-only permissions to a directory and its contents.
Which of the following commands will allow the user to accomplish this task?
  • A. chmod -R 600 /new_directory/
  • B. chmod 400 /new_directory/
  • C. chmod -R 400 /new_directory/
  • D. chmod 600 /new_directory/
正解：C
解説：
Read = 4, Write = 2, Execute = 1
Therefore the directory would need to be 400 and need to be recursive with the -R option.
Reference: https://linuxize.com/post/chmod-command-in-linux/

質問 # 225
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