Linux Foundation Certified System Administrator LFCS practice test

A system administrator needs to ensure the Apache httpd service starts automatically on system boot. Which command should they use?

Trap 1: systemctl start httpd

systemctl start only starts the service immediately, does not enable boot start.

Trap 2: systemctl disable httpd

systemctl disable removes symlinks, preventing boot start.

Trap 3: systemctl reload httpd

systemctl reload reloads configuration without changing enable status.

A
systemctl enable httpd
systemctl enable creates symlinks for automatic start at boot.
B
systemctl start httpd
Why wrong: systemctl start only starts the service immediately, does not enable boot start.
C
systemctl disable httpd
Why wrong: systemctl disable removes symlinks, preventing boot start.
D
systemctl reload httpd
Why wrong: systemctl reload reloads configuration without changing enable status.

Question 2hardmulti select

Which THREE of the following are valid methods to mount an NFS filesystem on a client?

Trap 1: echo 'server:/export /mnt nfs defaults 0 0' >> /etc/fstab && mount…

Incorrect: mount -a reads /etc/fstab but the command as written is incomplete; also mount -a alone is not a mount method.

Trap 2: mount -t cifs server:/share /mnt

Incorrect: -t cifs is for CIFS, not NFS.

A
echo 'server:/export /mnt nfs defaults 0 0' >> /etc/fstab && mount -a
Why wrong: Incorrect: mount -a reads /etc/fstab but the command as written is incomplete; also mount -a alone is not a mount method.
B
mount -o hard,intr server:/export /mnt
Correct: NFS mount with options.
C
mount -t cifs server:/share /mnt
Why wrong: Incorrect: -t cifs is for CIFS, not NFS.
D
mount -t nfs server:/export /mnt
Correct: Explicit NFS type.
E
mount -t nfs4 server:/export /mnt
Correct: NFSv4 type.

Question 3easymultiple choice

Refer to the exhibit. The administrator wants to create a RAID 1 array using /dev/sdb1 and /dev/sdc1. Which command should be used?

Exhibit

Refer to the exhibit.

# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   20G  0 disk
├─sda1   8:1    0    1G  0 part /boot
├─sda2   8:2    0   10G  0 part /
└─sda3   8:3    0    9G  0 part [SWAP]
sdb      8:16   0   10G  0 disk
└─sdb1   8:17   0   10G  0 part
sdc      8:32   0    5G  0 disk
└─sdc1   8:33   0    5G  0 part /data

Trap 1: mdadm --create /dev/md0 --level=5 --raid-devices=2 /dev/sdb1…

Incorrect: RAID 5 needs at least 3 devices.

Trap 2: mdadm --create /dev/md0 --level=10 --raid-devices=2 /dev/sdb1…

Incorrect: RAID 10 needs at least 4 devices.

Trap 3: mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdb1…

Incorrect: level=0 creates RAID 0, not RAID 1.

A
mdadm --create /dev/md0 --level=5 --raid-devices=2 /dev/sdb1 /dev/sdc1
Why wrong: Incorrect: RAID 5 needs at least 3 devices.
B
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
Correct: RAID 1 requires level=1.
C
mdadm --create /dev/md0 --level=10 --raid-devices=2 /dev/sdb1 /dev/sdc1
Why wrong: Incorrect: RAID 10 needs at least 4 devices.
D
mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdb1 /dev/sdc1
Why wrong: Incorrect: level=0 creates RAID 0, not RAID 1.

Question 4mediummultiple choice

A system administrator needs to list all files in the current directory, including hidden files, in a long listing format sorted by modification time (oldest first). Which command achieves this?

Trap 1: ls -lihrt

Includes inode and human-readable but missing -t, sorts by name.

Trap 2: ls -lat

Shows newest first, not oldest.

Trap 3: ls -lrt

Lacks -a, so hidden files not shown.

A
ls -lihrt
Why wrong: Includes inode and human-readable but missing -t, sorts by name.
B
ls -lart
Correct: long, all, reverse, time.
C
ls -lat
Why wrong: Shows newest first, not oldest.
D
ls -lrt
Why wrong: Lacks -a, so hidden files not shown.

Question 5easymultiple choice

A user wants to find all files in /var/log that have been modified within the last 2 days. Which command should they use?

Trap 1: find /var/log -mmin -2880

Correct in minutes but less standard for days.

Trap 2: find /var/log -mtime +2

Finds files modified more than 2 days ago.

Trap 3: find /var/log -mtime 2

Finds files modified exactly 2 days ago.

A
find /var/log -mtime -2
Finds files modified less than 2 days ago.
B
find /var/log -mmin -2880
Why wrong: Correct in minutes but less standard for days.
C
find /var/log -mtime +2
Why wrong: Finds files modified more than 2 days ago.
D
find /var/log -mtime 2
Why wrong: Finds files modified exactly 2 days ago.

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Question 6easymultiple choice

A user needs to view the contents of a compressed log file /var/log/syslog.gz without first decompressing it. Which command should they use?

Trap 1: gzip -d /var/log/syslog.gz

Same as gunzip, decompresses.

Trap 2: gunzip /var/log/syslog.gz

Decompresses to disk, not just view.

Trap 3: cat /var/log/syslog.gz

Outputs binary garbage.

A
zcat /var/log/syslog.gz
Correct: prints compressed file to stdout.
B
gzip -d /var/log/syslog.gz
Why wrong: Same as gunzip, decompresses.
C
gunzip /var/log/syslog.gz
Why wrong: Decompresses to disk, not just view.
D
cat /var/log/syslog.gz
Why wrong: Outputs binary garbage.