The correct action is to extract the URL from the alert and check the file hash. This is because the alert, typically generated by an intrusion detection system or web proxy, indicates a potential malware download over HTTP, where the URL points directly to a suspicious file. By retrieving that file and computing its hash—such as SHA256—the analyst can cross-reference it against threat intelligence platforms like VirusTotal to confirm whether the file is malicious and identify the specific malware family. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your ability to apply the incident response process, specifically the “investigate” phase, and distinguishes between simply viewing the alert and performing active validation. A common trap is to only analyze the URL itself or the source IP, but the exam emphasizes that the file hash provides definitive evidence of compromise. Remember the mnemonic “URL to Hash, then Clash”—extract the URL, compute the hash, and clash it against threat intel to confirm the threat.
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
[**] [1:2000002:3] ET MALWARE Possible Malicious Download [**]
[Priority: 2]
12/10/2023-10:45:23.456789 192.168.1.10:45678 -> 203.0.113.5:80
TCP TTL:64 TOS:0x0 ID:12345 IpLen:20 DgmLen:1500 DF
***A**** Seq: 0x12345678 Ack: 0x9ABCDEF0 Win: 0x2000 TcpLen: 20
[Xref => http://malware.example.com/samples/abc123]
Based on the exhibit, what action should the analyst take to further investigate this alert?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Extract the URL from the alert and check the file hash.
The analyst should extract the URL from the alert and check the file hash because the alert indicates a potential malware download via HTTP. By retrieving the file referenced in the URL, the analyst can compute its hash (e.g., MD5, SHA256) and compare it against known threat intelligence databases (e.g., VirusTotal) to confirm maliciousness and identify the specific malware family. This directly validates whether the detected event is a true positive and provides actionable indicators for containment.
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.
✓
Extract the URL from the alert and check the file hash.
Why this is correct
The reference URL provides direct access to potential malware.
Related concept
Read the scenario before looking for a memorised answer.
✗
Search the PCAP for the same signature ID.
Why it's wrong here
Searching for the same signature ID may not provide new information.
✗
Perform a DNS lookup on the destination IP.
Why it's wrong here
DNS lookup may not reveal malicious intent without additional context.
✗
Check the firewall logs for any blocked connections.
Why it's wrong here
Firewall logs may not contain the specific URL context.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that signature-based alerts are definitive, leading candidates to choose options like searching the PCAP for the same signature ID, when the real next step is to pivot from the alert's metadata (e.g., URL) to retrieve and analyze the actual payload.
Detailed technical explanation
How to think about this question
In network intrusion analysis, alerts from systems like Snort or Suricata often include a URL or URI field when HTTP traffic matches a rule. Extracting this URL allows the analyst to retrieve the actual file (e.g., an executable or PDF) and compute its cryptographic hash, which can be cross-referenced with threat intelligence feeds. This process is critical because signature-based detection alone may produce false positives (e.g., benign files matching generic rules), and the hash provides a unique, immutable identifier for the file that can be used for further sandboxing or IOC sharing.
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: Extract the URL from the alert and check the file hash. — The analyst should extract the URL from the alert and check the file hash because the alert indicates a potential malware download via HTTP. By retrieving the file referenced in the URL, the analyst can compute its hash (e.g., MD5, SHA256) and compare it against known threat intelligence databases (e.g., VirusTotal) to confirm maliciousness and identify the specific malware family. This directly validates whether the detected event is a true positive and provides actionable indicators for containment.
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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