XK0-005 practice questions 131–140

1. Question 131 · 300 in bank

   A Linux user is trying to execute commands with sudo but is receiving the following error: $ sudo visudo >>> /etc/sudoers: syntax error near line 28 <<< sudo: parse error in /etc/sudoers near line 28 sudo: no valid sudoers sources found, quitting The following output is provided: # grep root /etc/shadow root:*LOCK*:14600:::::: Which of the following actions will resolve this issue?

   • ALog in directly using the root account and comment out line 28 from /etc/sudoers.
   • BBoot the system in single user mode and comment out line 28 from /etc/sudoers.
   • CComment out line 28 from /etc/sudoers and try to use sudo again.
   • DLog in to the system using the other regular user, switch to root, and comment out line 28 from /etc/sudoers.

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   Answer: B

   Explanation

   So the root login is administratively locked. With *LOCK* in the password field, it means that nobody can log into the system as root user using a password. If the root account was configured for other authentication methods, like SSH keys or certificates, they could do so that way. That alone would not prevent regular users the ability to run "sudo", if they are configured properly in /etc/sudoers. That is because "sudo" uses the user's password, not the root password. But, the sudoers file is misconfigured, maybe someone tried editing it directly with "vim" rather than "visudo" and broke it. Now it seems that nobody can perform sudo and nobody can log in as root (thus, no permission to fix the sudoers file). A good course of action is to boot into single user mode, which would allow root access to a simplified system without a password, and fix the syntax error.

   Source: Adapted from community discussion — makuziker

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2. Question 132 · 300 in bank

   Users are experiencing high latency when accessing a web application served by a Linux machine. A systems administrator checks the network interface counters and sees the following:

   

   Which of the following is the most probable cause of the observed latency?

   • AThe network interface is disconnected.
   • BA connection problem exists on the network interface.
   • CNo IP address is assigned to the interface.
   • DThe gateway is unreachable.

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   Answer: B

   Explanation

   There is some reachability on this network, we can rule out answers that would result in zero connectivity. We can see that in received packets (RX), we have lots of errors, and some dropped. In transmitted packets (TX), we have carrier failures. Carrier problems would result in a poor connection and difficulty communicating. Thus, the answer is something vaguely about connection problems on the network interface.

   Source: Adapted from community discussion — makuziker

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3. Question 133 · 300 in bank

   A Linux administrator needs to create a symlink for /usr/local/bin/app-a, which was installed in /usr/local/share/app-a. Which of the following commands should the administrator use?

   • Aln -s /usr/local/bin/app-a /usr/local/share/app-a
   • Bmv -f /usr/local/share/app-a /usr/local/bin/app-a
   • Ccp -f /usr/local/share/app-a /usr/local/bin/app-a
   • Drsync -a/usr/local/share/app-a /usr/local/bin/app-a

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   Answer: A

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4. Question 134 · 300 in bank

   Select 2

   The applications team is reporting issues when trying to access the web service hosted in a Linux system. The Linux systems administrator is reviewing the following outputs: Output 1:

   

   Output 2:

   

   Which of the following statements best describe the root cause? (Choose two.)

   • AThe httpd service is currently started.
   • BThe httpd service is enabled to auto start at boot time, but it failed to start.
   • CThe httpd service was manually stopped.
   • DThe httpd service is not enabled to auto start at boot time.
   • EThe httpd service runs without problems.
   • FThe httpd service did not start during the last server reboot.

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   Answer: DF

   Explanation

   I'm going with D and F. It says "disabled" and "vendor preset: disabled" which tells us that the httpd service wasn't originally set to start on boot when it was installed and still hasn't been set to start on boot. Given this and the fact that they can't access the web service, it most definitely didn't start during the last reboot

   Source: Adapted from community discussion — BlackSkullz

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5. Question 135 · 300 in bank

   Which of the following specifications is used to perform disk encryption in a Linux system?

   • ALUKS
   • BTLS
   • CSSL
   • DNFS

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   Answer: A

   Explanation

   It would be the Linux Unified Key Setup (LUKS). LUKS is an encryption specification for encrypting block devices on Linux, such as partitions and disks. SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are protocols for encrypting data in transit NFS (Network File System) is a protocol that allows users to access files over a network as if they were on a local machine

   Source: Adapted from community discussion — BlackSkullz

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6. Question 136 · 300 in bank

   A junior developer is unable to access an application server and receives the following output: [root@server1 ~]# ssh dev2@172.16.25.126 dev2@172.16.25.126's password: Permission denied, please try again. dev2@172.16.25.126's password: Permission denied, please try again. dev2@172.16.25.126's password: Account locked due to 4 failed logins Account locked due to 5 failed logins Last login: Mon Apr 22 21:21:06 2021 from 172.16.16.52 The systems administrator investigates the issue and receives the following output: [root@server1 ~]# pam_tally2 --user=dev2 Login Failures Latest failure From dev2 5 04/22/21 21:22:37 172.16.16.52 Which of the following commands will help unlock the account?

   • Apam_tally2 --user=dev2 --quiet
   • Bpam_tally2 --user=dev2
   • Cpam_tally2 --user+dev2 --quiet
   • Dpam_tally2 --user=dev2 --reset

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   Answer: D

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7. Question 137 · 300 in bank

   A systems technician is configuring an application server to accept packets from a trusted source with the IP address 192.168.10.22. Which of the following commands will allow communication between the two servers?

   • Aiptables -L -s 192.168.10.22 -j ACCEPT
   • Biptables -D INPUT -s 192.168.10.22 -j ACCEPT
   • Ciptables -A INPUT -s 192.168.10.22 -j ACCEPT
   • Diptables -A OUTPUT -s 192.168.10.22 -j ACCEPT

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   Answer: C

   Explanation

   C iptables is a firewall management tool that allows you to add or remove entries. iptables -A is the "append" command to add a rule in a firewall iptables -D is the "delete" command used to delete a rule in a firewall.

   Source: Adapted from community discussion — FuzzyMuffin

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8. Question 138 · 300 in bank

   An administrator needs to increase the system priority of a process with PID 2274. Which of the following commands should the administrator use to accomplish this task?

   • Arenice -n -15 2274
   • Bnice -15 2274
   • Cecho "-15" > /proc/PID/2274/priority
   • Dps -ef | grep 2274

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   Answer: A

   Explanation

   The difference between A and B is that the "nice" command is used to modify the priority of processes when they start and "renice" is used to modify the priority of processes that already exist. In this case, the process is already running and has a PID number, so the "renice" command should be used to modify its priority

   Source: Adapted from community discussion — BlackSkullz

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9. Question 139 · 300 in bank

   A Linux administrator is creating a new sudo profile for the accounting user. Which of the following should be added by the administrator to the sudo configuration file so that the accounting user can run /opt/acc/report as root?

   • Aaccounting localhost=/opt/acc/report
   • Baccounting ALL=/opt/acc/report
   • C%accounting ALL=(ALL) NOPASSWD: /opt/acc/report
   • Daccounting /opt/acc/report=(ALL) NOPASSWD: ALL

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   Answer: B

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10. Question 140 · 300 in bank

    Which of the following commands will display the operating system?

    • Auname -n
    • Buname -s
    • Cuname -o
    • Duname -m

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    Answer: C

    Explanation

    The correct command to display the operating system is C. uname -o. The uname command is used to print system information. It has several options that can be used to print different types of information. Here's what each option does in the context of the given question: A. uname -n: prints the hostname of the machine. B. uname -s: prints the kernel name of the machine. C. uname -o: prints the operating system of the machine. D. uname -m: prints the machine hardware name. Therefore, the correct option to display the operating system is C (uname -o).

    Source: Adapted from community discussion — linux_admin

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XK0-005 practice, question 131. 300 questions available.