The answer is high volumes of outbound traffic to multiple destinations, as this pattern reflects a botnet’s core function: infected hosts communicating outward to command-and-control (C2) servers and relaying data or attack commands to numerous targets simultaneously. This indicator is technically significant because botnets often rely on IRC for C2, and attackers configure these channels on non-standard ports like 8080 or 8443 to bypass default monitoring, making persistent outbound connections to unusual ports a red flag. On the Cisco CyberOps Associate 200-201 exam, this concept tests your ability to distinguish normal client-server behavior from the distributed, coordinated traffic of a compromised host; a common trap is focusing only on inbound traffic or single-destination spikes. Remember the mnemonic “HOT” for High outbound, Odd ports, and To many destinations—if you see all three, suspect a botnet.
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE indicators are commonly found in network traffic that suggest a host is part of a botnet? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Connections to known IRC servers on non-standard ports
Option A is correct because botnets often use IRC (Internet Relay Chat) for command and control (C2) communication. Attackers configure IRC servers on non-standard ports (e.g., TCP 6667–6669 are common, but botnets may use ports like 8080, 8443, or random high ports) to evade detection by security tools that monitor default IRC ports. The presence of persistent IRC connections to unusual ports is a strong indicator of botnet activity.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Connections to known IRC servers on non-standard ports
Why this is correct
IRC is a common C2 channel.
Related concept
Read the scenario before looking for a memorised answer.
✗
Large file downloads from external servers
Why it's wrong here
Downloads are typically not a botnet indicator.
✓
Periodic connections to IP addresses with poor reputation
Read the scenario before looking for a memorised answer.
✓
High volumes of outbound traffic to multiple destinations
Why this is correct
Botnets often send stolen data or participate in DDoS.
Related concept
Read the scenario before looking for a memorised answer.
✗
Frequent DNS queries to legitimate corporate DNS servers
Why it's wrong here
This is normal traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between normal network behavior (like large downloads or frequent DNS queries) and specific botnet indicators (IRC on non-standard ports, connections to low-reputation IPs, and asymmetric outbound traffic patterns), trapping candidates who confuse generic high-bandwidth activity with botnet C2 signatures.
Detailed technical explanation
How to think about this question
Botnet C2 traffic often uses IRC with a custom protocol or encryption to blend in, and the periodic 'heartbeat' connections (e.g., every 60 seconds) to IP addresses with poor reputation (Option C) are classic indicators of a bot checking in for commands. High volumes of outbound traffic to multiple destinations (Option D) can reflect a host participating in DDoS attacks or scanning, which are common botnet activities. Under the hood, botnets may use fast-flux DNS or domain generation algorithms (DGAs) to rotate C2 domains, making reputation-based detection critical.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Intrusion Analysis — This question tests Network Intrusion Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Connections to known IRC servers on non-standard ports — Option A is correct because botnets often use IRC (Internet Relay Chat) for command and control (C2) communication. Attackers configure IRC servers on non-standard ports (e.g., TCP 6667–6669 are common, but botnets may use ports like 8080, 8443, or random high ports) to evade detection by security tools that monitor default IRC ports. The presence of persistent IRC connections to unusual ports is a strong indicator of botnet activity.
What should I do if I get this 200-201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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