200-201 Security Monitoring Practice Question
An analyst suspects a host is communicating with a command-and-control server using DNS tunneling. Which THREE network traffic patterns would support this hypothesis?
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
✓
Frequent use of TXT record type in DNS queries
DNS tunneling often uses high query volumes, TXT records to encode data, and large response sizes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Frequent use of TXT record type in DNS queries
Why this is correct
TXT records are commonly used to carry data in tunneling.
- ✓
DNS response sizes larger than typical A record responses
Why this is correct
Large responses may indicate embedded data.
- ✗
DNS queries with TTL values greater than 86400
Why it's wrong here
High TTL is not typical for tunneling.
- ✗
DNS queries for multiple well-known domains
Why it's wrong here
Normal browsing queries many domains, not indicative.
- ✓
High volume of DNS queries from a single host to a single domain
Why this is correct
Tunneling uses many queries to encode data.
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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.