PCNSE Practice Question: Securing Users and Applications with Authentication
A network security engineer is configuring an authentication profile on a Palo Alto Networks firewall to allow administrators to log in using their Active Directory credentials. The engineer wants to ensure that only members of the 'NetOps' group can access the firewall. Which setting in the authentication profile should be configured to enforce this?
⚠ Common exam trap
A common mix-up: candidates confuse the authentication sequence with the Allow List, assuming that the sequence itself can enforce 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
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Allow List
The Allow List in an authentication profile explicitly permits only specified users or groups to authenticate. By adding the 'NetOps' group, the firewall will check group membership during authentication and allow only those users. Other settings like authentication sequence, user domain, or Kerberos keytab do not provide this group-based restriction.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Allow List
Why this is correct
The Allow List in an authentication profile specifies which users or groups are permitted to authenticate. By adding the 'NetOps' group to the Allow List, only members of that group can successfully authenticate. This directly enforces the group-based access restriction described in the scenario.
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User Domain
Why it's wrong here
The User Domain setting specifies the domain to be used when authenticating users, such as 'example.com'. It does not filter users based on group membership. While it is necessary for proper authentication, it does not enforce the requirement that only 'NetOps' group members can log in.
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Kerberos Keytab
Why it's wrong here
A Kerberos keytab is used for Kerberos authentication, allowing the firewall to authenticate users without a password prompt. It does not control which groups can access the firewall. Group-based access control is handled by the Allow List setting in the authentication profile.
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Authentication Sequence
Why it's wrong here
An authentication sequence defines a list of authentication profiles to be tried in order, such as LDAP then RADIUS. It does not itself restrict access to specific groups; it only determines the sequence of authentication methods. The group restriction must be applied within an individual authentication profile, not the sequence.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Palo Alto Networks exam blueprint
This PCNSE practice question is part of Courseiva's free Palo Alto Networks 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 PCNSE exam.