CompTIA XK0-006 Online Practice Questions and Exam Preparation

CompTIA XK0-006 Online Questions & Answers

• Question 171:

  A systems administrator is writing a script to analyze the number of files in the directory /opt/application /home/.

  Which of the following commands should the administrator use in conjunction with ls -l | to count the files?

  A. less
  B. tail -f
  C. tr -c
  D. wc -l
  D. wc -l

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  Explanation

  Comprehensive and Detailed Explanation From Exact Extract:

  wc -l counts the number of lines of input provided to it, which is commonly used to count the number of files when used with ls -l (excluding the header line). For example, ls -l /opt/application/home/ | wc -l gives the total count of lines, which corresponds to the number of files and directories (including the total line at the top).

  Other options:

  A. less is a pager utility.

  B. tail -f shows the end of a file in real time.

  C. tr -c translates or deletes characters, not for counting lines.

  CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 4: "Working with the Command Line", Section: "Text Processing Commands" CompTIA Linux+ XK0-006 Objectives, Domain 1.0: System Management

• Question 172:

  Which of the following commands should a Linux administrator use to determine the version of a kernel module?

  A. modprobe bluetooth
  B. lsmod bluetooth
  C. depmod bluetooth
  D. modinfo bluetooth
  D. modinfo bluetooth

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  Explanation

  Kernel module management is an important part of Linux system administration and is covered in the Linux+ V8 objectives. When an administrator needs to determine metadata about a kernel module-such as its version, author, description, license, filename, and dependencies -the correct tool is modinfo.

  The command modinfo bluetooth displays detailed information about the specified kernel module, including the module version if it is defined. This makes it the correct and intended command for retrieving version details of kernel modules, whether or not the module is currently loaded.

  The other options are incorrect. modprobe bluetooth is used to load or unload kernel modules and does not display version information. lsmod lists loaded modules but does not show version details and does not accept module names as arguments in that manner. depmod is used to generate module dependency information and does not provide module metadata to the administrator.

  Linux+ V8 documentation specifically references modinfo as the utility for inspecting kernel module properties. This command is essential for troubleshooting driver issues, verifying compatibility, and auditing kernel components.

• Question 173:

  An administrator set up a new user account called "test". However, the user is unable to change their password. Given the following output:

  

  Which of the following is the most likely cause of this issue?

  A. The SUID bit is missing on the /bin/passwd file.
  B. The password provided by the user "test" does not meet complexity requirements.
  C. The user "test" already changed the password today.
  D. The password has been disabled for user "test".
  A. The SUID bit is missing on the /bin/passwd file.

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  Explanation

  For normal users to change their own password, /bin/passwd must have the SUID bit set (permissions should be -rwsr-xr-x). The SUID bit allows users to run the program with the permissions of the file owner (root), which is required to update /etc/shadow. The provided output shows /bin/passwd does not have the SUID bit (no 's' in the owner's execute field). As a result, user "test" receives an "Authentication token manipulation error". The password can be changed as root, which confirms it's a permissions/

  SUID issue.

  Other options:

  B. If the password didn't meet requirements, a different error would appear.

  C. There is no minimum day limit preventing password change (see chage -l output).

  D. The account and password are active (not disabled).

  CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 6: "User and Group Management", Section:"Managing User Passwords and Policies" CompTIA Linux+ XK0-006 Objectives, Domain 1.0: System Management

• Question 174:

  A systems administrator needs to enable routing of IP packets between network interfaces.

  Which of the following kernel parameters should the administrator change?

  A. net.ipv4.ip_multicast
  B. net.ipv4.ip_route
  C. net.ipv4.ip_local_port_range
  D. net.ipv4.ip_forward
  D. net.ipv4.ip_forward

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  Explanation

  IP packet forwarding is a key networking function in Linux system management and is explicitly referenced in the Linux+ V8 objectives. Enabling this feature allows a Linux system to act as a router by forwarding packets between network interfaces.

  The kernel parameter responsible for this behavior is net.ipv4.ip_forward. When this parameter is set to 1, the Linux kernel allows IPv4 packets to be forwarded between interfaces. By default, this setting is often disabled on non-routing systems for security reasons.

  The parameter can be modified temporarily using the sysctl command or permanently by editing /etc/sysctl. conf or files under /etc/sysctl.d/. Linux+ V8 documentation highlights this parameter as essential for configuring routing, NAT, and firewall-based gateway systems. The other options are incorrect. net.ipv4.ip_multicast controls multicast behavior, not packet forwarding. net. ipv4.ip_route is not a valid kernel parameter. net.ipv4.ip_local_port_range defines the range of ephemeral ports used by outgoing connections and has no effect on routing.

  Properly enabling IP forwarding is critical when configuring VPN gateways, firewalls, and network appliances.

• Question 175:

  On a Kubernetes cluster, which of the following resources should be created in order to expose a port so it is publicly accessible on the internet?

  A. Deployment
  B. Network
  C. Service
  D. Pod
  C. Service

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  Explanation

  Container orchestration concepts are part of the Automation and Orchestration domain in Linux+ V8. In Kubernetes, workloads run inside Pods, but Pods are not directly accessible from outside the cluster.

  To expose an application externally, a Service resource must be created. Services provide a stable network endpoint and can be configured as NodePort, LoadBalancer, or ClusterIP. Public exposure is typically achieved using NodePort or LoadBalancer types.

  Option C , Service, is correct. Deployments manage Pods, but they do not handle networking exposure. Pods represent running containers but lack external accessibility by default. "Network" is not a valid Kubernetes resource type.

  Linux+ V8 documentation highlights Services as the mechanism for exposing containerized applications.

• Question 176:

  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?

  A. firewalld -- add-service=dns, http,https -- zone=internal
  B. iptables -- enable-service='dns|http|https' -- zone=internal
  C. firewall-cmd --add-service={dns, http, https} --zone=internal
  D. systemctl mask firewalld --for={dns, http, https} --zone=internal
  C. firewall-cmd --add-service={dns, http, https} --zone=internal

• Question 177:

  A systems administrator received a report about issues with a Linux system. Given the following output:

  

  Which of the following is the best command to use to fix this issue?

  A. mkfs.xfs /var
  B. rm -rf /var/*
  C. lvextend -L +5G -r /dev/mapper/rootvg-varlv
  D. lvresize -L +2G -r /dev/mapper/rootvg-rootlv
  C. lvextend -L +5G -r /dev/mapper/rootvg-varlv

• Question 178:

  Which of the following describes how a user's public key is used during SSH authentication?

  A. The user's public key is used to hash the password during SSH authentication.
  B. The user's public key is verified against a list of authorized keys. If it is found, the user is allowed to log in.
  C. The user's public key is used instead of a password to allow server access.
  D. The user's public key is used to encrypt the communication between the client and the server.
  B. The user's public key is verified against a list of authorized keys. If it is found, the user is allowed to log in.