PDFを無料でダウンロードには102-500有効な練習テスト問題があります
102-500テストエンジンお試しセット、102-500問題集PDF
質問 # 50
Which of the following commands display the number of bytes transmitted and received via the etho network interface? (Choose TWO correct answer.)
- A. Route -v via etho
- B. Ip -s link show etho
- C. Netstat -s -I etho
- D. Ifconfig etho
- E. Ip stats show dev etho
正解：B、D
質問 # 51
What output does the command seq 1 5 20 produce?
- A. 5
10
15
20 - B. 2
3
4
5 - C. 1
2
3
4 - D. 1
6
11
16 - E. 1
5
10
15
正解：D
質問 # 52
Which of the following steps prevents a user from obtaining an interactive login session?
- A. Adding the user to /etc/noaccess.
- B. Running the command chsh -s /bin/false with the user name.
- C. Creating a .nologin file in the user's home directory.
- D. Removing the user from the group staff.
- E. Setting the UID for the user to 0.
正解：B
質問 # 53
Given the following user's crontab entry:
15 14 * * 1-5 /usr/local/bin/example.sh
When will the script /usr/local/bin/example.sh be executed?
- A. At 14:15 local time, February till June.
- B. At 15:14 local time, 1st to 5th day of month.
- C. At 14:15 local time, Monday to Friday
- D. At 14:15 local time, 1st to 5th day of month.
- E. At 14:15 local time, January till May.
正解：C
質問 # 54
On a Linux workstation, the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?
- A. There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.
- B. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.
- C. One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout.
- D. The local routing information may be corrupted and must be re-validated using a routing protocol.
- E. The Linux Kernel Routing Daemon (LKRD) is not running and should be started using its init script or systemd unit.
正解：B
質問 # 55
With X11 forwarding in ssh, what environment variable is automatically set in the remote host shell that is not set when X11 forwarding is not enabled? (Specify only the environment variable without any additional commands or values.)
正解：
解説：
DISPLAY, $DISPLAY
Explanation:
With X11 forwarding in ssh, the environment variable that is automatically set in the remote host shell is DISPLAY. This variable specifies the name of the X display to which X11 clients should connect. When X11 forwarding is enabled, the ssh server sets the DISPLAY variable to a value like localhost:10.0, which means that the X11 clients will connect to a proxy X11 display on the remote host. The proxy display will then forward the X11 protocol over ssh to the X server on the local host. This way, the X11 clients can display their graphical output on the local host, even though they are running on the remote host. If X11 forwarding is not enabled, the DISPLAY variable is not set by the ssh server, and the X11 clients will not be able to connect to any X display unless the user manually sets the DISPLAY variable to a valid value. However, this may not work if the X server on the local host does not allow remote connections or if there are firewall rules that block the X11 traffic.
References:
* 3: Built-in SSH X11 forwarding in PowerShell or Windows Command Prompt - X410
* 4: Understanding X11 Forwarding through SSH - start to finish steps
* 1: Why use ssh X11 forwarding with LSF; How to use ssh X11 forwarding - IBM
質問 # 56
Which of the following states can NetworkManager show regarding the system's network connectivity? (Choose two.)
- A. portal
- B. full
- C. up
- D. login-required
- E. firewalled
正解：A、B
質問 # 57
On a Linux system with shadow passwords enabled, which file in the file system contains the password hashes of all local users? (Specify the full name of the file, including path.)
正解：
解説：
/etc/shadow
Explanation:
On a Linux system with shadow passwords enabled, the file that contains the password hashes of all local users is /etc/shadow. This file is a replacement for the password field in /etc/passwd, which is a world-readable file that contains basic information about users. The /etc/shadow file is not readable by regular users, and it stores the encrypted passwords (or hashes) of each user, along with other information such as password expiration dates, minimum and maximum password ages, and password warning periods. The /etc/shadow file has nine colon-delimited fields for each user:
* Username: The name used when the user logs into the system.
* Password: The encrypted password of the user, or a special character that indicates the password status.
For example, an asterisk (*) means the account is locked, and an exclamation mark (!) means the password is expired.
* Last Password Change: The date of the last password change, expressed as the number of days since January 1, 1970.
* Minimum Password Age: The minimum number of days required between password changes. A zero means the password can be changed anytime.
* Maximum Password Age: The maximum number of days the password is valid. After this number of days, the password must be changed. A zero means the password never expires.
* Password Warning Period: The number of days before the password expires that the user will be warned. A zero means no warning is given.
* Password Inactivity Period: The number of days after the password expires that the account will be disabled. A negative value means the account is never disabled.
* Account Expiration Date: The date when the account will be disabled, expressed as the number of days since January 1, 1970. A zero means the account never expires.
* Reserved Field: A field for future use.
The /etc/shadow file can be modified by using the commands passwd and chage, which are used to change the password and the password aging information of a user, respectively. The /etc/shadow file should not be edited directly, but always through the tools provided by the distribution. For more details, see the shadow manual page.
References:
* LPIC-1 Exam 102 Objectives, Topic 110: Security, Subtopic 110.2: Use sudo to manage access to the root account, Weight: 2, Key Knowledge Areas: Configure sudo and sudoers. Use sudo to execute commands as another user.
* LPIC-1 Exam 102 Learning Materials, Topic 110: Security, Subtopic 110.2: Use sudo to manage access to the root account, Section 110.2.1: sudo and sudoers, Page 3-5.
質問 # 58
Which of the following nmcli subcommands exist? (Choose two.)
- A. nmcli address
- B. nmcli device
- C. nmcli wifi
- D. nmcli connection
- E. nmcli ethernet
正解：B、D
解説：
The nmcli command is a command-line interface for NetworkManager, which is a tool for configuring and managing network settings on Linux systems. The nmcli command consists of different subcommands that correspond to different aspects of network configuration and management. The subcommands are:
nmcli general: shows status and permissions of NetworkManager, as well as system hostname and logging level and domains.
nmcli connection: enables you to create, modify, activate, deactivate, delete, and show network connections.
nmcli device: enables you to show, modify, and control network devices, such as interfaces, bonds, teams, bridges, etc.
nmcli monitor: monitors activity of NetworkManager and watches for changes in the state of connectivity and devices.
nmcli networking: enables or disables overall networking.
nmcli radio: enables or disables radio transmitters for Wi-Fi, Bluetooth, and WWAN devices.
nmcli agent: registers as a secret agent that provides and caches network credentials.
The other options listed are not valid nmcli subcommands. There is no nmcli ethernet, nmcli wifi, or nmcli address subcommand. However, nmcli device and nmcli connection can be used to configure and manage Ethernet and Wi-Fi connections and addresses. Reference:
NetworkManager configuration and usage | SLE Micro 5.3
nmcli: NetworkManager Reference Manual - GNOME
nmcli: command not found - The Geek Diary
質問 # 59
What is the purpose of a screen reader?
- A. It displays lines and markers to help people use speed reading techniques.
- B. It manages and displays files that contain e-books.
- C. It reads text displayed on the screen to blind or visually impaired people.
- D. It reads the parameters of the attached monitors and creates an appropriate X11 configuration.
正解：C
解説：
A screen reader is a form of assistive technology that renders text and image content as speech or braille output. Screen readers are essential to people who are blind, and are useful to people who are visually impaired, illiterate, or have a learning disability. Linux has several screen readers available, such as Orca, Speakup, and Emacspeak. These screen readers can help users interact with the graphical or console interface, read documents and web pages, and perform various tasks on the system. References:
* Screen reader - Wikipedia
* Orca Screen Reader - GNOME
* Accessibility in Linux is good (but could be much better)
質問 # 60
Which of the following comparison operators for test work on elements in the file system? (Choose two.)
- A. -d
- B. -z
- C. -eq
- D. -lt
- E. -f
正解：A、E
質問 # 61
On a regular users workstation the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?
- A. There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.
- B. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.
- C. One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout.
- D. The local routing information may be corrupted and must be re-validated using a routing protocol.
正解：B
質問 # 62
Which configuration file would you edit to change default options for outbound ssh sessions?
- A. /etc/ssh/ssh
- B. /etc/ssh/ssh_config
- C. /etc/ssh/sshd_config
- D. /etc/ssh/client
- E. /etc/ssh/ssh_client
正解：B
質問 # 63
Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?
- A. core
- B. ulimit
- C. edquota
- D. quota
正解：B
質問 # 64
What the echo $$ command?
- A. The process ID of the current shell.
- B. The process ID of the last command executed.
- C. The process ID of the echo command.
- D. The process ID of the last command which has been placed in the background.
- E. The process ID for the following command.
正解：A
質問 # 65
Which of the following are syslog facilities? (Choose TWO correct answers.)
- A. postmaster
- B. mail
- C. advanced
- D. remote
- E. local7
正解：B、E
質問 # 66
In which file, if present, must all users be listed that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)
正解：
解説：
etccronallow
Explanation:
The /etc/cron.allow file is a file that contains a list of users who are allowed to use the cron scheduling system. The cron scheduling system is a way of running commands or scripts at specified times or intervals. Users can create their own cron jobs by using the crontab command, which edits a file called crontab that stores the user's scheduled tasks. However, not all users may have access to the crontab command or the cron system. The access is controlled by two files: /etc/cron.allow and /etc/cron.deny. If the /etc/cron.allow file exists, then only the users listed in this file can use the crontab command and the cron system. The file should have one user name per line. If the /etc/cron.allow file does not exist, then the /etc/cron.deny file is checked. If this file exists, then the users listed in this file are denied access to the crontab command and the cron system. If neither file exists, then the access depends on the configuration of the cron daemon, which is the program that runs the cron jobs. By default, only the root user can use the cron system if no files exist. The root user can always use the cron system regardless of the existence or content of these files. To create or edit the /etc/cron.allow file, the root user needs to use a text editor such as vi, nano, or emacs. For example, to allow the users alice and bob to use the cron system, the root user can use the following command:
sudo vi /etc/cron.allow
And then add the following lines to the file:
alice bob
And then save and exit the file. Reference:
How cron.allow and cron.deny can be used to limit access to crontab for ...
/etc/cron.allow - Linux Bash Shell Scripting Tutorial Wiki
Linux / UNIX Restrict at / cron Usage To Authorized Users
質問 # 67
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Lpi 102-500試験は、60問の多肢選択および記述式問題から構成され、90分以内に完了する必要があります。試験は英語、ドイツ語、日本語、ポルトガル語、スペイン語で利用可能であり、候補者は500点以上のスコアを獲得する必要があります。認定は有効期間が5年であり、その後は認定ステータスを維持するために再認定する必要があります。Lpi 102-500認定は、IT業界で広く認知され、Linuxシステム管理におけるキャリアアップを目指す個人にとって貴重な財産です。
Lpiの102-500試験は、ファイルシステムの管理、ネットワークの設定、システムのメンテナンス、およびトラブルシューティングなど、さまざまなトピックをカバーしています。この試験は、Linuxシステムとサービスをインストール、構成、および維持する能力を評価するために設計されています。この試験はまた、さまざまなLinuxユーティリティとコマンドに関する知識、および一般的なLinuxシステムの問題をトラブルシューティングする能力もテストします。Lpiの102-500試験に合格することは、候補者が効果的なLinuxシステム管理者であるために必要なスキルを持っており、プロの環境でLinuxシステムを管理する能力を持っていることを示します。
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