This 200-901 practice question tests your understanding of application deployment and security. 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.
Which THREE of the following are common security vulnerabilities listed in the OWASP Top 10? (Choose three.)
Cross-Site Scripting (XSS)
Included in OWASP Top 10 as an injection issue.
Broken Access Control
A top vulnerability according to OWASP.
Multi-Factor Authentication
Why wrong: MFA is a security measure, not a vulnerability.
SQL Injection
A classic injection vulnerability in the OWASP Top 10.
DNS Cache Poisoning
Why wrong: This is a network attack, not in OWASP Top 10.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cross-Site Scripting (XSS)
Cross-Site Scripting (XSS) is a common security vulnerability in the OWASP Top 10 because it allows attackers to inject malicious scripts into web pages viewed by other users, typically through input fields that are not properly sanitized. This can lead to session hijacking, defacement, or redirection to malicious sites, exploiting the trust a user has in a legitimate application.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Cross-Site Scripting (XSS)
Why this is correct
Included in OWASP Top 10 as an injection issue.
Related concept
Read the scenario before looking for a memorised answer.
Broken Access Control
Why this is correct
A top vulnerability according to OWASP.
Related concept
Read the scenario before looking for a memorised answer.
Multi-Factor Authentication
Why it's wrong here
MFA is a security measure, not a vulnerability.
SQL Injection
Why this is correct
A classic injection vulnerability in the OWASP Top 10.
Related concept
Read the scenario before looking for a memorised answer.
DNS Cache Poisoning
Why it's wrong here
This is a network attack, not in OWASP Top 10.
Common exam traps
Cisco often tests whether candidates can distinguish between actual vulnerabilities (like XSS, Broken Access Control, SQL Injection) and security controls or network-layer attacks, leading them to mistakenly select Multi-Factor Authentication or DNS Cache Poisoning as OWASP Top 10 items.
Detailed technical explanation
The OWASP Top 10 is a community-driven list of the most critical web application security risks, updated periodically (e.g., 2021 edition). XSS vulnerabilities typically arise when user input is reflected or stored without proper encoding, allowing execution of arbitrary JavaScript in the victim's browser context. Broken Access Control, the top risk in the 2021 list, occurs when applications fail to enforce proper authorization checks, enabling users to access resources or functions beyond their intended permissions. SQL Injection exploits improper handling of user input in database queries, allowing attackers to execute arbitrary SQL commands, often leading to data exfiltration or destruction.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 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
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FAQ
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
The correct answer is: Cross-Site Scripting (XSS) — Cross-Site Scripting (XSS) is a common security vulnerability in the OWASP Top 10 because it allows attackers to inject malicious scripts into web pages viewed by other users, typically through input fields that are not properly sanitized. This can lead to session hijacking, defacement, or redirection to malicious sites, exploiting the trust a user has in a legitimate application.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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