200-201 Network Intrusion Analysis Practice Question
A PCAP contains the following patterns: (1) A TCP connection with a complete handshake to an external IP on port 443, (2) periodic data transfers every 60 seconds of approximately 1 KB, (3) the domain name in the TLS SNI field is generated by a DGA. Which THREE indicators are present?
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
✓
Beaconing
Beaconing is periodic callbacks, C2 over HTTPS uses port 443, and DGA domains indicate automated C2 infrastructure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Beaconing
Why this is correct
Regular intervals (60s) indicate beaconing.
- ✓
Domain generation algorithm (DGA) usage
Why this is correct
DGA domain in SNI field.
- ✗
DNS exfiltration
Why it's wrong here
No DNS queries with encoded data mentioned.
- ✓
C2 communication over HTTPS
Why this is correct
HTTPS on port 443 with periodic traffic is typical C2.
- ✗
Port scanning
Why it's wrong here
No scanning patterns; single connection.
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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.