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LFCS practice examsIn development

Linux Foundation Certified System Administrator

CNCF / Linux Foundation · intermediate · 2 hours

In developmentThis course is still being brought to our full standard. The questions and notes are usable, but they have not yet been checked line by line against the vendor’s own training.

Performance-based Linux administration across distributions: the shell, text processing and scripting, users, permissions and hardening, networking and systemd services, and storage with LVM, filesystems and the maintenance that keeps a system healthy.

What you get

180practice questions
3full papers of 60
4course chapters · 24 minutes
100%answers explained

Papers are cut from the bank and weighted like the real exam, and no question appears in two of them. Every wrong answer comes back on later days until you have it right.

What the exam covers

The domains our question bank is built on. We have not yet transcribed this vendor’s own outline for this exam.

Operations deployment and essential commandsNot published
Users, groups, permissions and system securityNot published
Networking and service configurationNot published
Storage management and system maintenanceNot published

Two sample questions

Two of the 180, with the answer and the explanation.

1. Why might key-based SSH login fail despite the key being in authorized_keys?

  1. The key was generated on a different distribution
  2. The server has PasswordAuthentication still enabled
  3. The client has not added the host to known_hosts
  4. The home or .ssh directory permissions are too permissive — correct

Why: sshd refuses to trust a key file that others could have written, and the failure is silent unless you read the log.

2. What does useradd do?

  1. Creates a new user account — correct
  2. Deletes an existing account
  3. Changes a user's password
  4. Lists the group memberships

Why: useradd creates a new user account according to defaults and the options given.

The real LFCS exam

Length2 hours
QuestionsEntirely performance-based tasks on a live system; no multiple choice
Pass mark66%
Price$395 USD, including one free retake
Recommended before you sit itNone. The exam is distribution-agnostic, with a choice of Ubuntu or CentOS Stream at the start.
Valid for3 years

Exam facts as published by CNCF / Linux Foundation; always check the vendor’s page before you book.

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