LPIC-2 DNS, Web and Mail Services Practice Question
Which TWO statements are true regarding BIND DNS server security? (Choose two.)
⚠ Common exam trap
Many exam-takers confuse the purpose of 'allow-transfer' (zone transfer restriction) with recursion control, and assuming 'forwarders' disables recursion when it actually just redirects queries to another resolver.
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
✓
The 'allow-recursion' ACL can be used to restrict which clients can use the server's recursive lookup feature.
The 'allow-recursion' ACL in BIND explicitly controls which clients are permitted to use the server's recursive query feature. By restricting recursion to trusted clients, the server avoids being used in amplification attacks and reduces exposure to cache poisoning. This ACL is defined in the options block or per-zone and can reference address match lists or named ACLs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The 'allow-transfer' ACL is used to restrict which clients can perform recursive queries.
Why it's wrong here
allow-transfer restricts zone transfers, not recursion.
- ✓
The 'allow-recursion' ACL can be used to restrict which clients can use the server's recursive lookup feature.
Why this is correct
allow-recursion limits recursive queries to specific clients.
- ✗
The 'blackhole' ACL can be used to prevent cache poisoning attacks.
Why it's wrong here
blackhole discards queries from certain sources, but does not prevent cache poisoning; DNSSEC does.
- ✗
The 'forwarders' option can be used to disable recursion entirely.
Why it's wrong here
forwarders only redirect queries; recursion can be disabled with 'recursion no'.
- ✓
The 'allow-query' ACL can be used to restrict which clients can send DNS queries to the server.
Why this is correct
allow-query limits the IP addresses that can query the server.
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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.