XK0-006 Security Practice Question
A security team wants to restrict SSH access to only users in the 'sshusers' group. Which configuration line in /etc/ssh/sshd_config achieves this?
⚠ Common exam trap
Watch out — candidates often confuse `AllowGroups` with `AllowUsers`; candidates often select `AllowUsers sshusers` thinking it applies to a group, but it only matches a literal username, not group membership.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AllowGroups sshusers
The `AllowGroups` directive in `/etc/ssh/sshd_config` restricts SSH login to users who are members of the specified group. By setting `AllowGroups sshusers`, only users in the 'sshusers' group are permitted to authenticate via SSH, meeting the security team's requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DenyGroups sshusers
Why it's wrong here
Denies the group, opposite of what is needed.
- ✓
AllowGroups sshusers
Why this is correct
Allows only members of sshusers group.
- ✗
AllowUsers sshusers
Why it's wrong here
AllowUsers expects usernames, not groups.
- ✗
Subsystem sftp /usr/lib/openssh/sftp-server
Why it's wrong here
Configures SFTP subsystem, not access control.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.