LPIC-2 File Sharing and Samba Practice Question
An organization is using Samba as a PDC with an LDAP backend for user accounts. Which idmap backend configuration is appropriate for RFC 2307?
⚠ Common exam trap
Test-takers frequently confuse the `ldap` idmap backend (used for RFC 2307 with a PDC) with the `ad` backend (used for Active Directory domain membership), or incorrectly assume that a local `tdb` or algorithmic `rid` backend can work with a centralized LDAP user store.
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
✓
idmap config * : backend = ldap
When Samba is configured as a PDC with an LDAP backend for user accounts and RFC 2307 is used, the idmap backend must be set to `ldap` to store and retrieve Unix UID/GID mappings directly from the LDAP directory. This ensures that the POSIX attributes (uidNumber, gidNumber) defined in LDAP are used consistently across all Samba clients, which is the core requirement of RFC 2307.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
idmap config * : backend = tdb
Why it's wrong here
tdb is for local file-based mapping.
- ✗
idmap config * : backend = ad
Why it's wrong here
ad backend is for Active Directory, not standalone LDAP.
- ✗
idmap config * : backend = rid
Why it's wrong here
rid is for AD environments, not LDAP.
- ✓
idmap config * : backend = ldap
Why this is correct
ldap backend stores mapping in LDAP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-2 practice question is part of Courseiva's free LPI 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 LPIC-2 exam.