- A
Command injection
Why wrong: Command injection uses system commands.
- B
Reflected XSS
Script tags in URI indicate reflected XSS.
- C
DOM-based XSS
Event handlers can be used in DOM-based XSS.
- D
Stored XSS
Why wrong: Stored XSS is stored on server, not in URI.
- E
SQL injection
Why wrong: SQL injection uses SQL keywords.
Question 872 of 1,000
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.
An analyst reviews a PCAP and sees HTTP requests containing script tags and event handlers such as 'onload' and 'onerror'. Additionally, the URI contains 'alert(1)'. Which TWO types of attacks are indicated? (Select 2)
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
✓
Reflected XSS
The presence of script tags, event handlers like 'onload' and 'onerror', and the URI containing 'alert(1)' indicates that the attacker is injecting client-side script into the HTTP response. Since the payload is reflected in the URI (likely in a query parameter or path) and executed immediately in the browser without being stored on the server, this is Reflected XSS (option B). The same payload can also be executed via client-side JavaScript that manipulates the DOM using untrusted data from the URI, which is characteristic of DOM-based XSS (option C).
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.
- ✗
Command injection
Why it's wrong here
Command injection uses system commands.
- ✓
Reflected XSS
Why this is correct
Script tags in URI indicate reflected XSS.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
DOM-based XSS
Why this is correct
Event handlers can be used in DOM-based XSS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Stored XSS
Why it's wrong here
Stored XSS is stored on server, not in URI.
- ✗
SQL injection
Why it's wrong here
SQL injection uses SQL keywords.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between Reflected and DOM-based XSS by presenting a payload that appears in the URI but is not reflected in the server's response body, leading candidates to incorrectly assume only one type is present.
Trap categories for this question
Keyword trap
SQL injection uses SQL keywords.
Command / output trap
Command injection uses system commands.
Detailed technical explanation
How to think about this question
Reflected XSS occurs when the server includes unvalidated input from the HTTP request (e.g., query string, form data) directly in the response HTML, allowing the browser to execute injected scripts. DOM-based XSS, by contrast, happens entirely on the client side when JavaScript code reads attacker-controlled data from the URL (e.g., location.hash, document.URL) and writes it into the DOM without sanitization, bypassing server-side filters. In a real-world scenario, a single request can exhibit both types if the server reflects the payload and the client-side script also processes the same URL fragment.
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 practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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FAQ
Questions learners often ask
What does this 200-201 question test?
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: Reflected XSS — The presence of script tags, event handlers like 'onload' and 'onerror', and the URI containing 'alert(1)' indicates that the attacker is injecting client-side script into the HTTP response. Since the payload is reflected in the URI (likely in a query parameter or path) and executed immediately in the browser without being stored on the server, this is Reflected XSS (option B). The same payload can also be executed via client-side JavaScript that manipulates the DOM using untrusted data from the URI, which is characteristic of DOM-based XSS (option C).
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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Last reviewed: Jul 4, 2026
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.
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