LPIC-2 DNS, Web and Mail Services Practice Question
This LPIC-2 practice question tests your understanding of dns, web and mail services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A DNS administrator wants to implement DNSSEC on an authoritative zone. Which TWO resource records are essential for DNSSEC?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DNSKEY
DNSKEY and RRSIG are the two essential resource records for DNSSEC. The DNSKEY record holds the public signing key, while the RRSIG record contains the digital signature for each RRset, allowing resolvers to verify authenticity and integrity of the zone data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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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NSEC
Why it's wrong here
NSEC records are used for authenticated denial of existence but are not strictly essential for basic DNSSEC; DNSKEY and RRSIG are core.
✓
DNSKEY
Why this is correct
DNSKEY records hold the public key used to verify signatures.
Related concept
Read the scenario before looking for a memorised answer.
✓
RRSIG
Why this is correct
RRSIG records contain the digital signatures for each RRset, verifying authenticity.
Related concept
Read the scenario before looking for a memorised answer.
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A
Why it's wrong here
A record is a regular resource record, not essential for DNSSEC.
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SOA
Why it's wrong here
SOA record is not specific to DNSSEC; it exists in all zones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse NSEC as essential because it is commonly associated with DNSSEC, but the question asks for records essential for DNSSEC itself, not for denial of existence.
Detailed technical explanation
How to think about this question
DNSSEC uses a chain of trust starting from the root zone's DNSKEY. Each zone's DNSKEY is signed by its parent's RRSIG, and the RRSIG record covers every RRset in the zone, including the DNSKEY itself. The NSEC/NSEC3 records are only needed for authenticated denial of existence, not for the core signing process.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
DNS, Web and Mail Services — This question tests DNS, Web and Mail Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: DNSKEY — DNSKEY and RRSIG are the two essential resource records for DNSSEC. The DNSKEY record holds the public signing key, while the RRSIG record contains the digital signature for each RRset, allowing resolvers to verify authenticity and integrity of the zone data.
What should I do if I get this LPIC-2 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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