- A
Multiple DNS queries to algorithmically generated domains that result in NXDOMAIN responses
DGA generates many domains, most of which don't exist, causing NXDOMAIN.
- B
Large DNS responses indicating amplification
Why wrong: That is more typical of DNS amplification attacks.
- C
DNS queries to a single domain with high frequency
Why wrong: That might be beaconing, but DGA uses many domains.
- D
DNS queries with long TTL values
Why wrong: TTL is not directly related to DGA.
Question 638 of 1,000
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. 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.
During an intrusion analysis, an analyst identifies that an attacker used a domain generation algorithm (DGA) to resolve C2 domains. Which of the following traffic patterns is most consistent with DGA?
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
✓
Multiple DNS queries to algorithmically generated domains that result in NXDOMAIN responses
DGA generates many random-looking domains, many of which will be non-existent (NXDOMAIN) as the attacker cycles through them.
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.
- ✓
Multiple DNS queries to algorithmically generated domains that result in NXDOMAIN responses
Why this is correct
DGA generates many domains, most of which don't exist, causing NXDOMAIN.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Large DNS responses indicating amplification
Why it's wrong here
That is more typical of DNS amplification attacks.
- ✗
DNS queries to a single domain with high frequency
Why it's wrong here
That might be beaconing, but DGA uses many domains.
- ✗
DNS queries with long TTL values
Why it's wrong here
TTL is not directly related to DGA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-201 question test?
Network Intrusion Analysis — This question tests Network Intrusion Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Multiple DNS queries to algorithmically generated domains that result in NXDOMAIN responses — DGA generates many random-looking domains, many of which will be non-existent (NXDOMAIN) as the attacker cycles through them.
What should I do if I get this 200-201 question wrong?
Identify which 200-201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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