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A systems administrator wants to be sure the sudo rules just added to /etc/sudoers are valid. Which of the following commands can be used for this task?
A. sudo vi check
B. test -f /etc/sudoers
C. visudo -c
D. cat /etc/sudoers | tee test
Answer: C
Explanation:
The command visudo -c can be used to check the validity of the sudo rules in the /etc/sudoers file.
The visudo command is a tool for editing and validating the /etc/sudoers file, which defines the rules for the sudo command. The -c option checks the syntax and logic of the file and reports any errors or warnings. The command visudo -c will verify the sudo rules and help the administrator avoid any mistakes. This is the correct command to use for this task. The other options are incorrect because they either do not check the validity of the file (test, sudo, or cat) or do not exist (sudo vi check). References: CompTIA Linux+ (XK0-
005) Certification Study Guide, Chapter 18: Securing Linux Systems, page 546.
NEW QUESTION # 26
Developers have requested implementation of a persistent, static route on the application server. Packets sent over the interface eth0 to 10.0.213.5/32 should be routed via 10.0.5.1. Which of the following commands should the administrator run to achieve this goal?
A. route -i etho -p add 10.0.213.5 10.0.5.1
B. echo "10.0.213.5 10.0.5.1 eth0" > /proc/net/route
C. ip route add 10.0.213.5/32 via 10.0.5.1 dev eth0
D. route modify eth0 +ipv4.routes "10.0.213.5/32 10.0.5.1"
Answer: C
Explanation:
The command ip route add 10.0.213.5/32 via 10.0.5.1 dev eth0 adds a static route to the routing table that sends packets destined for 10.0.213.5/32 (a single host) through the gateway 10.0.5.1 on the interface eth0.
This is the correct way to achieve the goal. The other options are incorrect because they either use the wrong syntax (route -i etho -p add), the wrong command (route modify), or the wrong file (/proc/net
/route). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, page 379.
NEW QUESTION # 27
A systems administrator detected corruption in the /data file system. Given the following output:
Which of the following commands can the administrator use to BEST address this issue?
A.
B.
C.
D.
Answer: B
Explanation:
Given that the /data filesystem (located on device /dev/sdc1) is using the ext4 filesystem and is corrupted, the best command to address the issue is:
fsck /dev/sdc1
This command runs a filesystem check and repair on the /dev/sdc1 partition, which is mounted at
/data.
Important: Before running fsck, ensure the partition is unmounted to avoid further corruption:
umount /data
fsck /dev/sdc1
NEW QUESTION # 28
A systems administrator is investigating a service that is not starting up. Given the following information:
Which of the following systemd commands should the administrator use in order to obtain more details about the failing service?
A. systemct1 info network
B. sysctl -a network
C. journalctl -xu network
D. systemct1 analyze network
Answer: C
Explanation:
The systemd is a system and service manager for Linux systems that provides a standard way to control and monitor system services. The systemd uses various commands and tools to manage and troubleshoot system services, such as systemct1, sysctl, and journalctl. The systemct1 command is used to start, stop, enable, disable, restart, reload, status, and list system services. The sysctl command is used to configure kernel parameters at runtime. The journalctl command is used to view and filter the logs of system services.
To investigate a service that is not starting up, the administrator can use the journalctl command with the - xu option. The -x option enables verbose output that includes explanatory text and priority information. The - u option filters the output by a specific unit name, such as network.service. Therefore, the command journalctl
-xu network will show detailed logs of the network service, which can help identify the cause of the failure.
The statement D is correct.
The statements A, B, and C are incorrect because they do not provide more details about the failing service.
The systemct1 analyze network command does not exist. The systemct1 info network command shows basic information about the network unit, such as description, load state, active state, sub state, and main PID.
The sysctl -a network command shows all kernel parameters related to network settings. References: [How to Use Systemd to Manage System Services]
NEW QUESTION # 29
A DevOps engineer needs to allow incoming traffic to ports in the range of 4000 to 5000 on a Linux server. Which of the following commands will enforce this rule?
A. iptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT
B. iptables filter -A INPUT -p tcp --dport 4000:5000 -D ACCEPT
C. iptables -f filter -I INPUT -p tcp --dport 4000:5000 -A ACCEPT
D. iptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT
Answer: D
Explanation:
The command iptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT will enforce the rule of allowing incoming traffic to ports in the range of 4000 to 5000 on a Linux server. The iptables command is a tool for managing firewall rules on Linux systems. The -t option specifies the table to operate on, in this case filter, which is the default table that contains the rules for filtering packets. The -A option appends a new rule to the end of a chain, in this case INPUT, which is the chain that processes the packets that are destined for the local system. The -p option specifies the protocol to match, in this case tcp, which is the transmission control protocol. The --dport option specifies the destination port or port range to match, in this case 4000:5000, which is the range of ports from 4000 to 5000. The -j option specifies the target to jump to if the rule matches, in this case ACCEPT, which is the target that allows the packet to pass through. The command iptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT will add a new rule to the end of the INPUT chain that will accept the incoming TCP packets that have a destination port between 4000 and 5000. This command will enforce the rule and allow the traffic to the specified ports. This is the correct command to use to accomplish the task. The other options are incorrect because they either use the wrong options (-f instead of -t or -D instead of -A) or do not exist (iptables filter -A INPUT -p tcp --dport 4000:5000 -D ACCEPT or iptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT). Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 18: Securing Linux Systems, page 543.
NEW QUESTION # 30
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