20+ practice questions focused on Network Intrusion Analysis — one of the most tested topics on the Cisco CyberOps Associate 200-201 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Network Intrusion Analysis PracticeA security analyst reviews an alert from the IPS that shows a spike in TCP SYN packets from an external IP to multiple internal hosts on port 443. What is the most likely attack type?
Explanation: A SYN flood attack exploits the TCP three-way handshake by sending a high volume of SYN packets to multiple hosts without completing the handshake, exhausting server resources. The alert describes a spike in TCP SYN packets from an external IP to multiple internal hosts on port 443, which matches the behavior of a distributed SYN flood targeting HTTPS services. This is the most likely attack because the IPS is detecting the initial connection attempts characteristic of a SYN flood.
An analyst notices that a host is sending large amounts of data to an external IP address on TCP port 22 during non-business hours. What is the most likely activity?
Explanation: SSH (TCP port 22) is commonly used for secure remote administration, but the scenario describes large data transfers to an external IP during non-business hours, which is a classic indicator of data exfiltration. Attackers often use SSH tunneling to bypass security controls and exfiltrate data because SSH encrypts the traffic, making it difficult for network monitoring tools to inspect the payload. The combination of high volume, external destination, and off-hours activity strongly suggests malicious data theft rather than legitimate administrative tasks.
An analyst sees an alert: 'ET POLICY Outgoing HTTP Request with Suspicious User-Agent (Mozilla/5.0 compatible; MSIE 6.0; Windows NT 5.1)'. The source is an internal host that typically uses Windows 10. What should the analyst suspect?
Explanation: The User-Agent string 'Mozilla/5.0 compatible; MSIE 6.0; Windows NT 5.1' mimics Internet Explorer 6 on Windows XP (NT 5.1). Since the source host normally runs Windows 10, this outdated and mismatched User-Agent is a strong indicator of malware attempting to disguise its traffic as legacy browser activity to evade detection.
During an investigation, an analyst finds that an internal host has been communicating with a known malicious IP on port 445. Which protocol is most likely involved?
Explanation: Port 445 is the default port for Microsoft SMB (Server Message Block) over TCP, used for file sharing, printer sharing, and other network services. Communication with a known malicious IP on this port strongly indicates SMB-based activity, such as exploitation of vulnerabilities like EternalBlue (MS17-010) or unauthorized file access.
An analyst reviews NetFlow data and sees a single internal IP communicating with many external IPs on port 53, each with small UDP packets. The internal host is not a DNS server. What is the most likely explanation?
Explanation: The internal host is not a DNS server, yet it is sending small UDP packets to many external IPs on port 53. This is characteristic of a DNS amplification attack, where the attacker spoofs the victim's IP address and sends small queries to open DNS resolvers, which then send large responses to the victim. The NetFlow data shows the victim receiving the amplified traffic, not initiating it, making C correct.
+15 more Network Intrusion Analysis questions available
Practice all Network Intrusion Analysis questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Network Intrusion Analysis. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Network Intrusion Analysis questions on the 200-201 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Network Intrusion Analysis is tested as part of the Cisco CyberOps Associate 200-201 blueprint. Practicing with targeted Network Intrusion Analysis questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Network Intrusion Analysis is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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