200-201 Network Intrusion Analysis Practice Question
An analyst notices that a DNS query for 'www.attacker.com' contains a long subdomain with Base64-encoded data. This activity is observed every 5 minutes. What exfiltration technique is most likely in use?
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
✓
DNS tunneling
DNS exfiltration encodes data in subdomain queries. The data is sent to a DNS server controlled by the attacker, who extracts it from the logs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Steganography
Why it's wrong here
Steganography hides data in images or media.
- ✓
DNS tunneling
Why this is correct
DNS tunneling uses DNS queries to exfiltrate data.
- ✗
HTTP POST exfiltration
Why it's wrong here
HTTP POST sends data in the body.
- ✗
FTP exfiltration
Why it's wrong here
FTP uses separate control and data connections.
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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.