LINUX FOUNDATION CERTIFIED SYSTEM ADMINISTRATOR (LFCS) CERTIFICATION
EXAM COMPLETE PRACTICE TEST BANK QUESTIONS AND ANSWERS | VERIFIED
SOLUTIONS | UPDATED 2026/2027 STUDY GUIDE
Examiner/Administrator: The Linux Foundation
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
LINUX FOUNDATION CERTIFIED SYSTEM ADMINISTRATOR (LFCS)
2026/2027 EDITION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
COMPLETE PRACTICE EXAM
120 MULTIPLE-CHOICE QUESTIONS
PASSING SCORE: 74%
TESTING TIME: 120 MINUTES
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
TABLE OF CONTENTS
Linux Commands & Shell Operations
File Systems & Storage Administration
User & Group Management
Process & Service Management
Networking Fundamentals
System Security & Access Control
Software Package Management
System Monitoring & Troubleshooting
System Boot & Kernel Operations
Automation & Scheduling Tasks
THE LINUX FOUNDATION CERTIFICATION PROGRAM || ALIGNED WITH CURRENT
LFCS COMPETENCY DOMAINS || ENTERPRISE LINUX ADMINISTRATION ||
PROFESSIONAL STUDY GUIDE || 100% VERIFIED | GRADED A+ || COMPREHENSIVE
CERTIFICATION PREPARATION || PREPARED FOR SYSTEM ADMINISTRATION
CERTIFICATION || PROFESSIONAL EXAMINATION USE
,Linux Commands & Shell Operations
Q1. A system administrator must locate all files larger than 500 MB under /var while
suppressing permission-denied messages. Which command best accomplishes this
requirement?
A. find /var -size +500M
B. find /var -type f -size +500M 2>/dev/null
C. locate /var +500M
D. grep 500M /var
Correct Answer: 🔴 B. find /var -type f -size +500M 2>/dev/null
Explanation: 🔹 The find utility is designed for filesystem searches. Option B
restricts results to files, searches for files larger than 500 MB, and redirects
permission errors to /dev/null. Option A does not suppress errors and may include
non-file objects. locate relies on a database and cannot filter by file size. grep
searches file content rather than file metadata.
Q2. A script must extract the third field from a colon-separated file such
as /etc/passwd . Which command is most appropriate?
A. cut -d: -f3 /etc/passwd
B. grep -f3 /etc/passwd
C. awk -d: '{print $3}' /etc/passwd
D. sed -n 3p /etc/passwd
Correct Answer: 🔴 A. cut -d: -f3 /etc/passwd
Explanation: 🔹 The cut command is specifically designed for field extraction. The
delimiter is set to a colon and field three is selected. grep has no such field-selection
capability. awk could perform the task but requires a different syntax. sed line
printing is unrelated to field extraction.
,Q3. Which command displays the absolute path of the executable that would run
when a user types ssh ?
A. pwd ssh
B. where ssh
C. which ssh
D. find ssh
Correct Answer: 🔴 C. which ssh
Explanation: 🔹 The which command searches the user's PATH and displays the
executable that will be invoked. pwd displays the current directory. where is not a
standard Linux command. find requires a filesystem search and is less efficient for
this purpose.
Q4. An administrator wants to display the last 25 lines of a growing application log
and continuously monitor new entries. Which command should be used?
A. tail -f -n 25 logfile
B. head -25 logfile
C. cat logfile | more
D. grep logfile
Correct Answer: 🔴 A. tail -f -n 25 logfile
Explanation: 🔹 tail displays the end of a file, and the -f option follows new
additions in real time. head shows only the beginning of a file. cat and more do not
dynamically monitor changes. grep is intended for pattern matching.
Q5. Which shell operator ensures that the second command executes only if the first
command succeeds?
A. ;
B. &&
, C. ||
D. |
Correct Answer: 🔴 B. &&
Explanation: 🔹 The logical AND operator executes the second command only when
the first returns a successful exit status. A semicolon executes commands regardless
of success. The OR operator executes the second command only when the first fails.
A pipe passes output between commands.
Q6. A user accidentally deleted a file but discovers it is still open by a running
process. Which utility helps identify the process?
A. psaux
B. lsof
C. chmod
D. df
Correct Answer: 🔴 B. lsof
Explanation: 🔹 lsof lists open files and the processes using them. This is invaluable
when investigating deleted but still-open files. ps displays processes but not
necessarily open files. chmod changes permissions. df reports filesystem usage.
User & Group Management
Q7. A new employee requires a home directory and default shell assignment during
account creation. Which command provides both automatically?
A. groupadd employee
B. useradd -m employee
C. passwd employee
D. id employee
Correct Answer: 🔴 B. useradd -m employee
EXAM COMPLETE PRACTICE TEST BANK QUESTIONS AND ANSWERS | VERIFIED
SOLUTIONS | UPDATED 2026/2027 STUDY GUIDE
Examiner/Administrator: The Linux Foundation
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
LINUX FOUNDATION CERTIFIED SYSTEM ADMINISTRATOR (LFCS)
2026/2027 EDITION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
COMPLETE PRACTICE EXAM
120 MULTIPLE-CHOICE QUESTIONS
PASSING SCORE: 74%
TESTING TIME: 120 MINUTES
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
TABLE OF CONTENTS
Linux Commands & Shell Operations
File Systems & Storage Administration
User & Group Management
Process & Service Management
Networking Fundamentals
System Security & Access Control
Software Package Management
System Monitoring & Troubleshooting
System Boot & Kernel Operations
Automation & Scheduling Tasks
THE LINUX FOUNDATION CERTIFICATION PROGRAM || ALIGNED WITH CURRENT
LFCS COMPETENCY DOMAINS || ENTERPRISE LINUX ADMINISTRATION ||
PROFESSIONAL STUDY GUIDE || 100% VERIFIED | GRADED A+ || COMPREHENSIVE
CERTIFICATION PREPARATION || PREPARED FOR SYSTEM ADMINISTRATION
CERTIFICATION || PROFESSIONAL EXAMINATION USE
,Linux Commands & Shell Operations
Q1. A system administrator must locate all files larger than 500 MB under /var while
suppressing permission-denied messages. Which command best accomplishes this
requirement?
A. find /var -size +500M
B. find /var -type f -size +500M 2>/dev/null
C. locate /var +500M
D. grep 500M /var
Correct Answer: 🔴 B. find /var -type f -size +500M 2>/dev/null
Explanation: 🔹 The find utility is designed for filesystem searches. Option B
restricts results to files, searches for files larger than 500 MB, and redirects
permission errors to /dev/null. Option A does not suppress errors and may include
non-file objects. locate relies on a database and cannot filter by file size. grep
searches file content rather than file metadata.
Q2. A script must extract the third field from a colon-separated file such
as /etc/passwd . Which command is most appropriate?
A. cut -d: -f3 /etc/passwd
B. grep -f3 /etc/passwd
C. awk -d: '{print $3}' /etc/passwd
D. sed -n 3p /etc/passwd
Correct Answer: 🔴 A. cut -d: -f3 /etc/passwd
Explanation: 🔹 The cut command is specifically designed for field extraction. The
delimiter is set to a colon and field three is selected. grep has no such field-selection
capability. awk could perform the task but requires a different syntax. sed line
printing is unrelated to field extraction.
,Q3. Which command displays the absolute path of the executable that would run
when a user types ssh ?
A. pwd ssh
B. where ssh
C. which ssh
D. find ssh
Correct Answer: 🔴 C. which ssh
Explanation: 🔹 The which command searches the user's PATH and displays the
executable that will be invoked. pwd displays the current directory. where is not a
standard Linux command. find requires a filesystem search and is less efficient for
this purpose.
Q4. An administrator wants to display the last 25 lines of a growing application log
and continuously monitor new entries. Which command should be used?
A. tail -f -n 25 logfile
B. head -25 logfile
C. cat logfile | more
D. grep logfile
Correct Answer: 🔴 A. tail -f -n 25 logfile
Explanation: 🔹 tail displays the end of a file, and the -f option follows new
additions in real time. head shows only the beginning of a file. cat and more do not
dynamically monitor changes. grep is intended for pattern matching.
Q5. Which shell operator ensures that the second command executes only if the first
command succeeds?
A. ;
B. &&
, C. ||
D. |
Correct Answer: 🔴 B. &&
Explanation: 🔹 The logical AND operator executes the second command only when
the first returns a successful exit status. A semicolon executes commands regardless
of success. The OR operator executes the second command only when the first fails.
A pipe passes output between commands.
Q6. A user accidentally deleted a file but discovers it is still open by a running
process. Which utility helps identify the process?
A. psaux
B. lsof
C. chmod
D. df
Correct Answer: 🔴 B. lsof
Explanation: 🔹 lsof lists open files and the processes using them. This is invaluable
when investigating deleted but still-open files. ps displays processes but not
necessarily open files. chmod changes permissions. df reports filesystem usage.
User & Group Management
Q7. A new employee requires a home directory and default shell assignment during
account creation. Which command provides both automatically?
A. groupadd employee
B. useradd -m employee
C. passwd employee
D. id employee
Correct Answer: 🔴 B. useradd -m employee
