hardMultiple ChoiceObjective-mapped
200-201 Practice Question: Based on the exhibit, what condition triggers an…
Exhibit
Refer to the exhibit.
{
"policy": "DNS Anomaly Detection",
"rule": {
"protocol": "udp",
"port": 53,
"threshold": 1000,
"window": 60,
"action": "alert"
}
}Based on the exhibit, what condition triggers an alert?
⚠ Common exam trap
Cisco often tests the distinction between a rate-based threshold (counting events over time) and a signature-based match (single event), leading candidates to confuse a single malicious query with a volumetric anomaly.
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
✓
More than 1000 DNS queries from a single source within 60 seconds.
The exhibit shows a rule configured to trigger an alert when the number of DNS queries from a single source IP exceeds 1000 within a 60-second sliding window. This is a rate-based threshold designed to detect DNS amplification or tunneling attacks, where a single host generates an abnormally high volume of DNS requests. Option A correctly describes this condition.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
More than 1000 DNS queries from a single source within 60 seconds.
Why this is correct
This matches typical DNS anomaly detection for excessive queries.
- ✗
A single DNS query to a known malicious domain.
Why it's wrong here
The rule does not mention domain names.
- ✗
Any UDP traffic to port 53 exceeding 1000 packets per second.
Why it's wrong here
The window is 60 seconds, not per second.
- ✗
More than 1000 UDP connections to port 53 within 60 seconds.
Why it's wrong here
DNS uses queries, not connections; also threshold likely per source.
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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.