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NEW QUESTION # 168
You are a systems administrator and have created an uncompressed backup of the application directory. Several hours later, you must restore the application from backup.
INSTRUCTIONS
Within each tab, click on an object to form the appropriate command used to create the backup and restore the application.
Command objects may only be used once, and not all will be used. Click the arrow to remove any unwanted objects from your command.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Answer:
Explanation:
see the solution in Explanation below.
Explanation:
This performance-based question tests correct use of the tar utility for backup and restore operations, which is part of System Management in CompTIA Linux+ V8. The key detail is that the backup is explicitly described as uncompressed, so the correct archive file must be a plain .tar file rather than .tar.gz, .tgz, or .tar.bz2.
For the backup command, the correct syntax is:
tar -cvf /backups/application.tar -C /opt/ application
Here, -c creates the archive, -v enables verbose output, and -f specifies the archive filename. The -C /opt/ option changes to the /opt/ directory before archiving, and application is then archived relative to that location. This is the correct Linux+ method because it avoids storing unnecessary leading path components in the archive.
For the restore command, the correct syntax is:
tar -xvf /backups/application.tar -C /opt/
Here, -x extracts the archive, -v displays files being restored, and -f identifies the archive file. The -C /opt/ option ensures the archived application directory is restored back into /opt/, recreating /opt/application correctly.
The other file choices such as /backups/application.tar.gz, /backups/application.tgz, and /backups/application.
tar.bz2 are incorrect because they indicate compressed backups, which the question specifically rules out.
Likewise, options such as -xzvf or -xjvf are used for gzip- or bzip2-compressed archives and would not apply here.
Therefore, the verified correct PBQ answers are:
Backup: tar -cvf /backups/application.tar -C /opt/ application
Restore: tar -xvf /backups/application.tar -C /opt/
NEW QUESTION # 169
A systems administrator is restoring data from a backup. While analyzing the file format, the administrator sees the following output:
data: 7-zip archive data, version 0.4
Which of the following commands should the administrator use to help extract the data?
Answer: A
Explanation:
The output indicates the file is a 7-zip archive, and the 7za command is specifically designed to extract 7-zip formatted archives, making it the appropriate tool to restore the data.
NEW QUESTION # 170
Which of the following cryptographic functions ensures a hard drive is encrypted when not in use?
Answer: B
Explanation:
LUKS (Linux Unified Key Setup) provides full-disk encryption, ensuring that the data on a hard drive is protected and unreadable when the system is powered off or the drive is not in use.
NEW QUESTION # 171
An administrator needs to append the output of a Linux command to an existing file for later analysis. Which of the following command-line strings should the administrator use?
Answer: D
Explanation:
The correct answer is D. ls > > file.txt because the > > (double greater-than) operator is specifically used in Linux to append output to an existing file without overwriting its current contents. This is a fundamental concept in shell redirection and is widely used in scripting and automation tasks.
In this command, ls generates a list of directory contents, and > > file.txt ensures that this output is added to the end of the file. If the file does not exist, it will be created automatically. If it does exist, the existing content remains intact, and the new output is appended below it.
Option A (cat ls > file.txt) is incorrect because cat ls attempts to read a file named "ls," not execute the ls command. Additionally, > would overwrite the file instead of appending.
Option B (tee ls > awk file.txt) is invalid syntax and does not correctly use tee or redirection. The tee command is used to write output to both stdout and a file, but this example is malformed.
Option C (echo ls | sed -i file.txt) is incorrect because it does not execute the ls command; it simply echoes the string "ls" and attempts to modify a file using sed improperly.
From a Linux+ perspective, understanding redirection operators ( > , > > , |) is essential for automation and scripting. The > > operator is especially important when logging outputs, collecting command results, or building reports over time without losing previous data.
NEW QUESTION # 172
An
administrator is investigating the reason a Linux workstation is not resolving the website http://www.comptia.
org. The administrator executes some commands and receives the following output:
Which of the following is the most likely cause?
Answer: C
Explanation:
When troubleshooting name resolution issues in Linux, /etc/hosts entries take precedence over DNS lookups.
The workstation's /etc/hosts file contains the line:
CopyEdit
104.18.99.101 www.comptia.org
This means any attempt to access www.comptia.org will resolve to 104.18.99.101, regardless of the real DNS response. However, both dig and nslookup show the correct IP as 104.18.16.29. Because the local /etc/hosts entry overrides DNS, and the hardcoded IP is either incorrect or unreachable, all network traffic to www.
comptia.org will fail or not reach the intended destination, resulting in the observed connectivity issue (Destination Host Unreachable).
Other options:
B). The lack of IPv6 support is irrelevant since the host is using IPv4 and the DNS queries for IPv4 (A record) are successful.
C). The firewall would block all HTTP/HTTPS connections, but the error shown is a host unreachable, not a port-specific issue.
D). The nameserver is working; both dig and nslookup queries succeed and return the correct A record.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 8: " Networking Fundamentals " , Section: " Troubleshooting Name Resolution " CompTIA Linux+ XK0-006 Objectives, Domain 2.0: Networking
NEW QUESTION # 173
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