200-201 Network Intrusion Analysis Practice Question
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.
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.