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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Passing Score: | 720 (scale 100–900) |
| Exam Duration: | 90 minutes |
| Exam Format: | Performance-based questions, Multiple-choice |
| Exam Price: | $358 USD |
| Related Certifications: | CompTIA Network+ CompTIA A+ CompTIA Server+ |
| Certificate Validity Period: | 3 years |
| Real Exam Qty: | Up to 90 |
| Available Languages: | English |
| Recommended Training: | CompTIA CertMaster Learn CompTIA Official Study Materials |
| Exam Registration: | CompTIA Official Registration Pearson VUE Exam Scheduling |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE testing centers |
| Pre Condition: | No mandatory prerequisites; 12 months of hands-on Linux experience or CompTIA A+/Network+/Server+ recommended |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 42
A Linux administrator attempts to log in to a server over SSH as root and receives the following error message: Permission denied, please try again. The administrator is able to log in to the console of the server directly with root and confirms the password is correct. The administrator reviews the configuration of the SSH service and gets the following output:
Based on the above output, which of the following will most likely allow the administrator to log in over SSH to the server?
Answer: B
Explanation:
The SSH configuration option PermitRootLogin prohibit-password prevents the root user from logging in with password authentication. This setting means root cannot use a password to log in via SSH; only key- based authentication is permitted for root. The administrator can still log in as root locally, which is not affected by this SSH configuration. To allow SSH access as root, the administrator must use an SSH key instead of a password.
Other options:
* A. MaxSessions controls the number of simultaneous SSH sessions but is not causing the login denial here.
* B. PAM (Pluggable Authentication Modules) is disabled, but enabling it is not required for basic SSH authentication.
* C. Changing the SSH port is unrelated to the authentication method issue.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: "Securing Linux", Section: "Securing SSH Access" CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security
NEW QUESTION # 43
Users report that a Linux system is unresponsive and simple commands take too long to complete. The Linux administrator logs in to the system and sees the following:
Which of the following is the system experiencing?
Answer: B
Explanation:
The load averages (8.71, 8.24, 7.71) are well above the number of CPUs (4), showing CPU saturation. Additionally, Output 2 indicates very high CPU usage (65.88% usr, 20.54% sys) with
0% idle, confirming the system is under heavy CPU load, which explains the unresponsiveness.
NEW QUESTION # 44
A Linux administrator tries to install Ansible in a Linux environment. One of the steps is to change the owner and the group of the directory /opt/Ansible and its contents. Which of the following commands will accomplish this task?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The chown command is used to change the owner and group of files and directories. The -R (recursive) flag ensures that all contents within the directory are also updated. The correct syntax is chown -R owner:group directory. So, chown -R Ansible:Ansible /opt/Ansible will change the owner and group for /opt/Ansible and everything inside it to " Ansible " .
Other options:
A). groupmod is used to modify group properties, not ownership of directories or files.
C). usermod is for modifying user properties or group memberships.
D). chmod changes permissions, not owner/group.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 6: " User and Group Management " , Section: " Managing File Ownership and Permissions " CompTIA Linux+ XK0-006 Objectives, Domain 1.0: System Management
NEW QUESTION # 45
A technician wants to temporarily use a Linux virtual machine as a router for the network segment 10.10.204.0
/24. Which of the following commands should the technician issue? (Select three).
Answer: A,C,D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
To temporarily configure a Linux virtual machine as a router, the technician must enable IP forwarding and set up iptables rules to allow and masquerade traffic:
* A. echo "1" > /proc/sys/net/ipv4/ip_forward: Enables IPv4 forwarding in the Linux kernel, allowing the VM to forward packets between interfaces.
* B. iptables -A FORWARD -j ACCEPT: Adds a rule to the iptables firewall to accept all forwarded packets (allows traffic to be routed).
* G. iptables -t nat -s 10.10.204.0/24 -A POSTROUTING -j MASQUERADE: Sets up network address translation (NAT) for outgoing packets from the 10.10.204.0/24 subnet, masquerading them as if they are coming from the VM's external IP.
Other options:
* C. and H. are not relevant for routing/NAT in this context (PREROUTING is generally used for DNAT, not for standard source NAT).
* D. is syntactically incorrect and mixes PREROUTING with MASQUERADE, which is not the proper combination for SNAT.
* E. disables forwarding.
* F. is not related to IP forwarding.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 9: "Networking", Section: "Configuring Linux as a Router" CompTIA Linux+ XK0-006 Objectives: Domain 2.0 - Networking Official CompTIA Linux+ Cert Guide, Chapter 12: "Firewall and NAT configuration"
NEW QUESTION # 46
While hardening a system, an administrator runs a port scan with Nmap, which returned the following output:
Which of the following is the best way to address this security issue?
Answer: A
Explanation:
Port 23/tcp indicates Telnet, which is insecure because it transmits data in plaintext. The best hardening approach is to disable and remove the Telnet service entirely, eliminating the vulnerability rather than just blocking it at the firewall. Secure alternatives like SSH should be used instead.
NEW QUESTION # 47
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