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NEW QUESTION # 189
A systems administrator needs to open the DNS TCP port on a Linux system from network
10.0.0.0/24. Which of the following commands should the administrator use for this task?
Answer: C
Explanation:
The ufw allow 53/tcp from 10.0.0.0/24 command explicitly opens TCP port 53 (DNS) for connections coming from the 10.0.0.0/24 network, which is the correct way to configure this firewall rule.
NEW QUESTION # 190
A systems administrator needs to open the DNS TCP port on a Linux system from network 10.0.0.0/24.
Which of the following commands should the administrator use for this task?
Answer: C
Explanation:
Firewall configuration is a key topic in the Security domain of CompTIA Linux+ V8. DNS primarily uses UDP port 53, but TCP port 53 is also required for zone transfers, large responses, and certain reliability scenarios. In this case, the administrator explicitly needs to allow DNS over TCP from a specific network.
The correct command is ufw allow 53/tcp from 10.0.0.0/24. This rule allows incoming TCP traffic on port 53 only from the specified subnet, following the principle of least privilege. Linux+ V8 documentation emphasizes restricting firewall rules by source network whenever possible to minimize attack surfaces.
Option A is incorrect because UFW service aliases like dns are not always guaranteed to map explicitly to TCP, and the syntax is incomplete. Option B is invalid because ufw enable is used to enable the firewall globally and does not define rules. Option D disables firewall protections and introduces a major security risk.
Linux+ V8 best practices stress precise, minimal firewall rules instead of broad or disabling actions.
Therefore, C is the correct and secure choice.
NEW QUESTION # 191
A user states that an NFS share Is reporting random disconnections. The systems administrator obtains the following information
Which of the following best explains the symptoms that are being reported?
Answer: C
Explanation:
This issue is best analyzed using a layered troubleshooting approach, as recommended in the Troubleshooting domain of CompTIA Linux+ V8. The reported symptom is intermittent or random disconnections from an NFS share, which commonly indicates a network reliability issue rather than a configuration or filesystem problem.
The most critical evidence comes from the output of ip -s link show. The network interface enp1s0 is reporting significant numbers of errors and dropped packets on both the receive (RX) and transmit (TX) paths. High packet loss at the network interface level directly affects protocols like NFS, which rely on stable, continuous TCP/IP communication. When packets are dropped or corrupted, NFS clients may experience timeouts, retransmissions, and apparent disconnections.
Although the df -h output shows that the NFS filesystem is 95% full, this alone does not typically cause random disconnections. A nearly full filesystem may lead to write failures or performance degradation, but it does not explain intermittent connectivity loss. Linux+ V8 documentation notes that filesystem capacity issues usually present as I/O errors, not transport-layer disconnects.
Options A and B can also be ruled out. If the mount point or IP address were incorrect, the NFS share would fail consistently rather than intermittently. The fact that the share is mounted and accessible confirms that the mount configuration and IP addressing are correct.
Linux+ V8 emphasizes that NFS performance and reliability are highly sensitive to network quality. Packet errors, drops, faulty NICs, cabling issues, duplex mismatches, or driver problems commonly result in unstable NFS behavior.
Therefore, the best explanation for the reported random disconnections is D. The interface is reporting a high number of errors and dropped packets.
NEW QUESTION # 192
A systems administrator manages multiple Linux servers and needs to set up a reliable and secure way to handle the complexity of managing event records on the OS and application levels.
Which of the following should the administrator do?
Answer: C
NEW QUESTION # 193
A Linux systems administrator needs to extract the contents of a file named /home/dev/web.bkpto the /var/www/html/directory.
Which of the following commands should the administrator use?
Answer: D
Explanation:
The .bkp file here is a cpio archive, not a tar or zip. The correct way to extract it is by changing into the target directory (/var/www/html/) and using cpio -idv < /home/dev/web.bkp. The pushd and popd commands ensure the administrator returns to the original directory afterward.
NEW QUESTION # 194
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