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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Automation and Scripting | 17% | - Shell scripting and automation
|
| Topic 2: Troubleshooting | 22% | - System and hardware issues
|
| Topic 3: System Management | 23% | - Installation, configuration, and maintenance
|
| Topic 4: Services and User Management | 20% | - Service configuration and operation
|
| Topic 5: Security | 18% | - System hardening and compliance
|
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NEW QUESTION # 35
System users are being randomly disconnected from a server. The systems administrator inspects the following output:
# ping 192.168.1.1
--- 192.168.1.1 ping statistics ---
100 packets transmitted, 4 received, 96% packet loss
# ip -s link show
RX: errors 400000
TX: errors 150000
# ip route
default via 192.168.1.1 dev enp0s25 proto dhcp src 192.168.1.102 metric 600 Which of the following should the administrator do to fix the issue?
Answer: C
Explanation:
The correct answer is B. Replace the NIC because the output clearly indicates a hardware-level network issue, specifically with the network interface card (NIC). The ping results show 96% packet loss, which is extremely high and suggests severe communication failure between the system and the gateway. While packet loss can be caused by various issues, the key evidence comes from the ip -s link show output.
The interface statistics show a very large number of RX (receive) and TX (transmit) errors, which are abnormal and indicate that packets are being corrupted or dropped at the hardware or driver level. In a properly functioning interface, error counts should remain very low or zero. Such high error rates strongly suggest a failing NIC, faulty cable, or physical connection issue. Among the provided options, replacing the NIC is the most direct and appropriate solution.
Option A (Assign a proper gateway) is incorrect because the routing table already shows a valid default gateway (192.168.1.1). The system is able to send packets, but they are being lost due to errors, not misrouting. Option C (Increase the ping ' s TTL) is incorrect because TTL affects how long packets can traverse networks, not packet loss due to hardware errors. Option D (Increase the MTU size) is also incorrect because MTU mismatches typically cause fragmentation issues, not massive RX/TX errors.
In Linux troubleshooting, analyzing interface statistics using ip -s link is a critical skill. High error counters are a strong indicator of physical or hardware faults. Therefore, replacing the NIC (or checking cables and hardware) is the correct action to restore reliable network connectivity.
NEW QUESTION # 36
A Linux administrator is configuring a CUPS print service on a Linux machine and needs to allow only connections from a local network (192.168.100.0/24). Which of the following commands should the administrator use?
Answer: D
Explanation:
Firewall management is a core competency in Linux+ V8, and iptables remains a fundamental tool for defining network access rules. In this scenario, the administrator needs to control traffic directed to the local CUPS service. CUPS (Common Unix Printing System) typically listens on TCP port 631.
To allow external clients from a specific network to connect to this server, the rule must be added to the INPUT chain, as the traffic is coming into the host. The correct command is iptables -A INPUT -s
192.168.100.0/24 --dport 631 -p tcp -j ACCEPT.
Breaking down the command:
* -A INPUT: Appends the rule to the Input chain (for incoming traffic).
* -s 192.168.100.0/24: Specifies the source network that is permitted.
* --dport 631: Targets the destination port where the CUPS service is listening.
* -p tcp: Specifies the protocol.
* -j ACCEPT: Defines the action to take (allow the packet).
The other options are incorrect. Options A and B target the OUTPUT chain, which controls traffic leaving the server; this would not prevent unauthorized incoming connections. Option D uses the -D flag, which is used to delete an existing rule rather than add one, and it also uses the -d (destination) flag incorrectly for a source restriction.
Therefore, Option C is the verified method for implementing this security requirement using iptables.
NEW QUESTION # 37
Which of the following is the first step when starting a new Python project on a Linux system?
Answer: D
Explanation:
Creating a virtual environment is the first step because it provides an isolated Python runtime for the project, allowing dependencies to be managed independently without affecting the system- wide Python installation.
NEW QUESTION # 38
A systems administrator needs to check the statuses of all the services on a Linux server. Which of the following commands accomplishes this task?
Answer: A
Explanation:
Service management using systemd is a core Linux+ V8 system management objective. Administrators frequently need to view the current status of all services to determine which ones are running, stopped, failed, or inactive.
The correct command is systemctl list-units --type=services, which displays all loaded service units along with their current state, including whether they are active, inactive, failed, or running. This provides a comprehensive, real-time view of service statuses on the system and is commonly used during troubleshooting and audits.
Option A, systemctl is-active, is designed to check the status of a single service, not all services. Option B lists socket units, not services. Option C, systemctl is-enabled, checks whether services are enabled at boot, not whether they are currently running.
Linux+ V8 documentation explicitly references systemctl list-units --type=service as the primary command for viewing service runtime states. Therefore, the correct answer is D.
NEW QUESTION # 39
A DevOps engineer needs to create a local Git repository. Which of the following commands should the engineer use?
Answer: D
Explanation:
The git init command initializes a new, empty Git repository in the current directory, making it the correct choice for creating a local repository.
NEW QUESTION # 40
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