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Scenario-based practice

Troubleshooting Scenario Questions

Practise Linux Foundation Certified System Administrator LFCS practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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LFCS
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Linux Foundation
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Scenario guide

How to approach troubleshooting scenario questions

These questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure.

Quick answer

Troubleshooting Scenario Questions questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

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Practice set

Practice scenarios

Question 1mediummultiple choice
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A systems administrator is troubleshooting a server that runs a database application. The server has 64 GB of RAM and 16 CPU cores. The administrator notices that the system is using a significant amount of swap space even though there is plenty of free memory. The 'free -m' command shows: total memory = 65536, used = 50000, free = 15536, buffers/cache = 10000, swap total = 8192, swap used = 6000. Which of the following is the most likely cause?

Question 2mediummultiple choice
Read the full DHCP explanation →

A system administrator is managing a RHEL 8 server that requires a static IP address on interface ens192. The administrator modifies /etc/sysconfig/network-scripts/ifcfg-ens192 to set BOOTPROTO=static, IPADDR=192.168.1.100, PREFIX=24, GATEWAY=192.168.1.1, and DNS1=8.8.8.8. After saving, the administrator runs 'systemctl restart NetworkManager'. The interface obtains the correct static IP and network connectivity works. However, after a reboot of the server, the interface fails to come up with the static IP and instead obtains an IP via DHCP from the local network. The administrator verifies that the DHCP server is active and that the physical connection is good. What is the most likely cause of the issue?

Question 3mediummultiple choice
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After editing /etc/sysconfig/network-scripts/ifcfg-eth0, the network service fails to start. Which is the best command to investigate?

Question 4easymultiple choice
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A user reports that a shell script 'backup.sh' in /home/user/scripts fails to execute. What is the most likely cause?

Question 5hardmultiple choice
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The backup script fails to run as user 'backup' with sudo. What is the issue?

Exhibit

Refer to the exhibit.

$ ls -l /usr/local/bin/backup.sh
-rwx------ 1 root root 1024 Jan  1 12:00 /usr/local/bin/backup.sh

$ sudo -u backup /usr/local/bin/backup.sh
sudo: unable to execute /usr/local/bin/backup.sh: Permission denied

$ id backup
uid=1003(backup) gid=1003(backup) groups=1003(backup)
Question 6hardmultiple choice
Read the full DNS explanation →

A Linux server is unable to resolve the hostname 'app.internal.example.com' but can resolve other names. The /etc/nsswitch.conf file contains: hosts: files mdns4_minimal [NOTFOUND=return] dns. The /etc/hosts file does not list the hostname. Which configuration change would most likely resolve the issue?

Question 7easymultiple choice
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A user reports that they cannot reach a remote server by hostname but can reach it by IP address. Which configuration file is most likely misconfigured?

Question 8easymultiple choice
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A junior admin runs 'systemctl restart httpd' but the httpd service fails to start. Which command should the admin use first to diagnose the problem?

Question 9hardmultiple choice
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A server has multiple IP aliases on eth0. Remote hosts cannot reach the secondary IP addresses. What should the administrator check?

Question 10hardmultiple choice
Review the full routing breakdown →

A host with this routing table can ping 10.0.2.1 but cannot ping 8.8.8.8. What is the most likely cause?

Exhibit

Refer to the exhibit.

# ip route show
10.0.1.0/24 dev eth0 proto kernel scope link src 10.0.1.10
10.0.2.0/24 dev eth1 proto kernel scope link src 10.0.2.10
default via 10.0.1.1 dev eth0
Question 11mediummultiple choice
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A system administrator is troubleshooting a performance issue. They need to identify which process is consuming the most CPU time over the last 24 hours. Which command should be used?

Question 12mediummultiple choice
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An administrator is unable to SSH into the server from a remote host at 192.168.1.100. Based on the exhibited iptables rules, what is the most likely reason?

Network Topology
10 840 ACCEPT alllo * 0.0.0.0/05 300 ACCEPT tcp0 0 DROP tcpRefer to the exhibit.
Question 13hardmulti select
Read the full DNS explanation →

An administrator is troubleshooting DNS resolution and wants to query the SOA record for a domain. Which three commands can be used? (Choose three.)

Question 14hardmultiple choice
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An administrator is troubleshooting intermittent connectivity issues. Running 'ping -c 100 -i 0.2 10.0.0.1' shows about 5% packet loss. What is the primary purpose of the '-i 0.2' option?

Question 15hardmultiple choice
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You are managing a multi-user Linux server used by a development team. The server has a shared directory /data/projects where each project has a subdirectory owned by a project lead. The requirement is that all members of the 'devteam' group need to be able to create files in any project subdirectory, but only the project lead (owner) should be able to delete files. Currently, members of devteam are unable to create files in /data/projects. You check permissions: /data/projects has drwxrwxr-x root:devteam. Each project subdirectory, e.g., /data/projects/proj1, has drwx------ lead1:devteam. The lead1 user is in devteam. What is the most likely reason that devteam members cannot create files in proj1, and what is the correct solution?

These LFCS practice questions are part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style LFCS questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.