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NEW QUESTION # 24
A Linux administrator implemented a new HTTP server using the default configuration.
None of the users on the network can access the server. If there is no problem on the network or with the users' workstations, which of the following steps will BEST analyze and resolve the issue?
- A. Run netstat to ensure the port is correctly bound, and configure the firewall to allow access on ports
80 and 443 - B. Run route to ensure the port is correctly bound, and configure the firewall to allow access on ports
80 and 443 - C. Run route to ensure the port is correctly bound, and configure SELinux to allow access on ports 80 and 443
- D. Run netcat to ensure the port is correctly bound, and configure a static route to the web to allow access on ports 80 and 443
Answer: A
Explanation:
https://www.cyberciti.biz/faq/unix-linux-check-if-port-is-in-use-command/
NEW QUESTION # 25
A Linux systems administrator receives a notification that one of the server's filesystems is full. Which of the following commands would help the administrator to identify this filesystem?
- A. du -ah
- B. lsblk
- C. fdisk
- D. df -h
Answer: D
NEW QUESTION # 26
A Linux administrator cloned an existing Linux server and built a new server from that clone. The administrator encountered the following error after booting the cloned server:
The administrator performed the commands listed below to further troubleshoot and mount the missing filesystem:
Which of the following should administrator use to resolve the device mismatch issue and mount the disk?
- A. mount disk by-label
- B. fsck -A
- C. mount disk by-blkid
- D. mount disk by device-id
Answer: D
Explanation:
Explanation
The administrator should use the command mount disk by device-id to resolve the device mismatch issue and mount the disk. The issue is caused by the cloned server having a different device name for the disk than the original server. The output of blkid shows that the disk has the device name /dev/sdb1 on the cloned server, but the output of cat /etc/fstab shows that the disk is expected to have the device name /dev/sda1. The command mount disk by device-id will mount the disk by using its unique identifier (UUID) instead of its device name. The UUID can be obtained from the output of blkid or lsblk -f. The command will mount the disk to the specified mount point (/data) and resolve the issue. The other options are incorrect because they either do not mount the disk (fsck -A), do not use the correct identifier (mount disk by-label or mount disk by-blkid), or do not exist (mount disk by-blkid). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Storage, pages 318-319.
NEW QUESTION # 27
Which of the following is the BEST reason for not storing database files in the /var directory?
- A. Files in /var do not have strict file permissions.
- B. If log files fill up /var, it might corrupt the database.
- C. The /var filesystem is not fast enough for database files.
- D. The number of files in /var is limited by the available inodes.
Answer: B
NEW QUESTION # 28
A systems administrator is receiving tickets from users who cannot reach the application app that should be listening on port 9443/tcp on a Linux server.
To troubleshoot the issue, the systems administrator runs netstat and receives the following output:
Based on the information above, which of the following is causing the issue?
- A. The application is listening on port 1234.
- B. The application is not running.
- C. The application is listening on the loopback interface.
- D. The IP address 0.0.0.0 is not valid.
Answer: C
Explanation:
The server is in a "Listen" state on port 9943 using its loopback address. The "1234" is a process-id The cause of the issue is that the application is listening on the loopback interface. The loopback interface is a virtual network interface that is used for internal communication within the system. The loopback interface has the IP address 127.0.0.1, which is also known as localhost. The netstat output shows that the application is listening on port 9443 using the IP address 127.0.0.1. This means that the application can only accept connections from the same system, not from other systems on the network. This can prevent the users from reaching the application and cause the issue. The administrator should configure the application to listen on the IP address 0.0.0.0, which means all available interfaces, or on the specific IP address of the system that is reachable from the network. This will allow the application to accept connections from other systems andresolve the issue. The cause of the issue is that the application is listening on the loopback interface. This is the correct answer to the question. The other options are incorrect because they are not supported by the outputs. The IP address 0.0.0.0 is valid and means all interfaces, the application is not listening on port 1234, and the application is running as shown by the process ID 1234. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, page 383.
NEW QUESTION # 29
A junior administrator is installing kernel modules. The administrator is given a checklist that outlines the following tasks to be completed:
- Display currently installed module version.
- Display which modules loaded at startup.
Which of the following commands would be used to accomplish these tasks? (Choose two.)
- A. rmmod
- B. insmod
- C. depmod
- D. cat /etc/issue
- E. dmesg
- F. lsmod
Answer: E,F
Explanation:
System administrators can use lsmod, modprobe, and dmesg to get information about the kernel.
NEW QUESTION # 30
A new Linux systems administrator just generated a pair of SSH keys that should allow connection to the servers. Which of the following commands can be used to copy a key file to remote servers? (Choose two.)
- A. ssh-copy-id
- B. ftpd
- C. ssh-keyscan
- D. wget
- E. ssh-keygen
- F. scp
Answer: A,F
Explanation:
The commands ssh-copy-id and scp can be used to copy a key file to remote servers. The command ssh-copy-id copies the public key to the authorized_keys file on the remote server, which allows the user to log in without a password. The command scp copies files securely over SSH, which can be used to transfer the key file to any location on the remote server. The other options are incorrect because they are not related to copying key files. The command wget downloads files from the web, the command ssh-keygen generates key pairs, the command ssh-keyscan collects public keys from remote hosts, and the command ftpd is a FTP server daemon. Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Managing Network Services, pages 408-410.
NEW QUESTION # 31
A cloud engineer needs to launch a container named web-01 in background mode. Which of the following commands will accomplish this task''
- A. docker run -d --name web-01 httpd
- B. docker load --name web-01 httpd
- C. docker ps -a --name web-01 httpd
- D. docker builder -f -name web-01 httpd
Answer: A
NEW QUESTION # 32
A systems administrator was tasked with assigning the temporary IP address/netmask
192.168.168.1/255.255.255.255 to the interface eth0 of a Linux server.
When adding the address, the following error appears:
# ip address add 192.168.168.1/33 dev eth0
Error: any valid prefix is expected rather than "192.168.168.1/33".
Based on the command and its output above, which of the following is the cause of the issue?
- A. There is no route to 192.168.168.1/33.
- B. The CIDR value /33 should be /32 instead.
- C. The IP address 192.168.168.1 is already in use.
- D. The interface eth0 does not exist.
Answer: B
Explanation:
Explanation
The cause of the issue is that the CIDR value /33 is invalid for an IPv4 address. The CIDR value represents the number of bits in the network prefix of an IP address, and it can range from 0 to 32 for IPv4 addresses. A CIDR value of /33 would imply a network prefix of more than 32 bits, which is impossible for an IPv4 address. To assign a temporary IP address/netmask of 192.168.168.1/255.255.255.255 to eth0, the CIDR value should be /32 instead, which means a network prefix of 32 bits and a host prefix of 0 bits. There is no route to
192.168.168.1/33 is not the cause of the issue, as the ip address add command does not check the routing table.
The interface eth0 does not exist is not the cause of the issue, as the ip address add command would display a different error message if the interface does not exist. The IP address 192.168.168.1 is already in use is not the cause of the issue, as the ip address add command would display a different error message if the IP address is already in use. References: [CompTIA Linux+ (XK0-005) Certification Study Guide], Chapter 13:
Networking Fundamentals, page 435.
NEW QUESTION # 33
A Linux administrator is setting up a testing environment and needs to connect to a separate testing server using the production server name. The administrator needs to override the hostname that the DNS is returning in order to use the test environment. Which of the following commands should be run on each of the testing systems to BEST meet this goal?
- A. # ip addr add 192.168.1.100/24 dev eth0 && rndc reload
- B. # hostnamectl set-hostname "192.168.1.100 production.company.com"
- C. # grep -i IP "${ip addr show} production.company.com" > /etc/resolv.conf
- D. production.company.com
# echo "192.168.1.100 production.company.com" >> /etc/hosts
Answer: D
Explanation:
hostnamectl is for your own host name and it modifies the /etc/hostname file (your name). The
/etc/hosts file, as lizano stated maps hostnames and IPs of other systems and has a priority over DNS.
NEW QUESTION # 34
A developer has been unable to remove a particular data folder that a team no longer uses. The developer escalated the issue to the systems administrator. The following output was received:
Which of the following commands can be used to resolve this issue?
- A. chgrp -R 755 data/
- B. chmod -R 777 data/
- C. chown -R data/
- D. chattr -R -i data/
Answer: D
Explanation:
Explanation
The command that can be used to resolve the issue of being unable to remove a particular data folder is chattr
-R -i data/. This command will use the chattr utility to change file attributes on a Linux file system. The -R option means that chattr will recursively change attributes of directories and their contents. The -i option means that chattr will remove (unset) the immutable attribute from files or directories. When a file or directory has the immutable attribute set, it cannot be modified, deleted, or renamed.
The other options are not correct commands for resolving this issue. The chgrp -R 755 data/ command will change the group ownership of data/ and its contents recursively to 755, which is not a valid group name. The chgrp command is used to change group ownership of files or directories. The chmod -R 777 data/ command will change the file mode bits of data/ and its contents recursively to 777, which means that everyone can read, write, and execute them. However, this will not remove the immutable attribute, which prevents deletion or modification regardless of permissions. The chmod command is used to change file mode bits of files or directories. The chown -R data/ command is incomplete and will produce an error. The chown command is used to change the user and/or group ownership of files or directories, but it requires at least one argument besides the file name. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 7:
Managing Disk Storage; chattr(1) - Linux manual page; chgrp(1) - Linux manual page; chmod(1) - Linux manual page; chown(1) - Linux manual page
NEW QUESTION # 35
A systems administrator is reviewing the following output on the text editor that is being used to update the company's internal database records:
Which of the following extensions should the systems administrator use when saving the file?
- A. .json
- B. .yaml
- C. .tf
- D. .sh
Answer: B
NEW QUESTION # 36
A Linux administrator wants a permission bit on a shared folder that allows only the owner of the file within that directory or the root user to delete or rename the file. Which of the following commands will help achieve this goal?
- A. chmod +t /directory/
- B. chmod a-r /directory/
- C. chmod u-w /directory/
- D. chmod o-t /directory/
Answer: A
Explanation:
The +t option sets the "sticky bit" on a directory, which restricts deletion or renaming of files in the directory to the file's owner or the root user. This is commonly used in shared directories like /tmp, where multiple users may have access, but only the file owner should be allowed to modify their own files. The command chmod +t /directory/ applies this permission.
NEW QUESTION # 37
An administrator needs to kill the oldest Bash shell running in the system.
Which of the following commands should be issued to accomplish this task?
- A. kill -9 PID
ps -eo pid,etime,cmd | grep bash (to obtain PID) - B. killall -9 PID
killall -15 -o bash - C. kill -9 PID
ps -eo pid,etime| grep bash (to obtain PID) - D. ps axjf | grep bash to obtain PID
Answer: A
Explanation:
https://serverfault.com/questions/71360/find-and-kill-old-processes
NEW QUESTION # 38
Which of the following can reduce the attack surface area in relation to Linux hardening?
- A. Reducing the number of directories created
- B. Extending the SSH startup timeout period
- C. Enforcing password strength and complexity
- D. Customizing the log-in banner
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Reducing the attack surface area in Linux hardening refers to limiting possible points of unauthorized access.
According to the CompTIA Linux+ Official Study Guide (Exam XK0-005), enforcing strong password policies is a critical aspect of security hardening. This practice ensures that user accounts are protected by passwords that are difficult to guess or crack, thus minimizing the risk of successful brute-force attacks.
Implementing password complexity requirements (such as minimum length, use of uppercase, lowercase, numbers, and special characters) directly addresses one of the primary vectors for unauthorized access.
Other options do not have a direct impact on reducing the attack surface:
* A. Customizing the log-in banner serves as a legal notification and does not affect system vulnerabilities.
* B. Reducing the number of directories created is not related to hardening or access control.
* C. Extending the SSH startup timeout period may give attackers more time to attempt a connection and does not increase security.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-005, Sybex, Chapter 11: "Securing the System", Section:
"Implementing Password Policies"
CompTIA Linux+ XK0-005 Exam Objectives, Domain 3.0: Security
NEW QUESTION # 39
A Linux administrator is troubleshooting the root cause of a high CPU load and average.
Which of the following commands will permanently resolve the issue?
- A. iostat -cy 1 5
- B. pstree -p 6295
- C. kill -9 6295
- D. renice -n -20 6295
Answer: C
Explanation:
The command that will permanently resolve the issue of high CPU load and average is kill -9 6295. This command will send a SIGKILL signal to the process with the PID 6295, which is the process that is consuming 99.7% of the CPU according to the top output. The SIGKILL signal will terminate the process immediately and free up the CPU resources. The kill command is used to send signals to processes by PID or name.
The other options are not correct commands for resolving this issue. The renice -n -20 6295 command will change the priority (niceness) of the process with PID 6295 to -20, which is the highest priority possible. This will make the process more CPU-intensive, not less. The renice command is used to change the priority of running processes. The pstree -p 6295 command will show a tree of processes with PID 6295 as the root. This will not affect the CPU load or average, but only display information. The pstree command is used to display a tree of processes. The iostat -cy 1 5 command will show CPU and disk I/O statistics for 5 iterations with an interval of 1 second. This will also not affect the CPU load or average, but only display information. The iostat command is used to report CPU and I/O statistics. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 11: Troubleshooting Linux Systems; kill(1) - Linux manual page; renice (1) - Linux manual page; pstree(1) - Linux manual page; iostat(1) - Linux manual page
NEW QUESTION # 40
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?
- A. accounting localhost=/opt/acc/report
- B. accounting ALL=/opt/acc/report
- C. accounting /opt/acc/report=(ALL) NOPASSWD: ALL
- D. %accounting ALL=(ALL) NOPASSWD: /opt/acc/report
Answer: D
Explanation:
This answer allows the accounting user to run the /opt/acc/report command as root on any host without entering a password. The % sign indicates that accounting is a group name, not a user name. The ALL keyword means any host, any user, and any command, depending on the context. The NOPASSWD tag overrides the default behavior of sudo, which is to ask for the user's password.
NEW QUESTION # 41
......
One of the key benefits of the CompTIA Linux+ certification is that it is vendor-neutral. This means that the certification is not tied to a specific Linux distribution, but rather covers the general concepts and principles that apply to all Linux-based systems. This makes the certification a valuable asset for IT professionals who work with different Linux distributions and need to demonstrate their skills across multiple platforms.
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