Quick Answer
The correct answer is to use the Secure and HttpOnly flags on session cookies, combined with regenerating the session ID after login. The Secure flag ensures cookies are only transmitted over HTTPS, preventing interception during transit, while the HttpOnly flag blocks client-side scripts from accessing the cookie, mitigating cross-site scripting (XSS) attacks that steal session tokens. Session ID regeneration after authentication defeats session fixation attacks by invalidating any pre-set session identifier an attacker may have forced onto the user. On the CompTIA SecurityX CAS-004 exam, this question tests your ability to distinguish between session hijacking prevention and broader authentication controls—a common trap is confusing session timeout settings with active hijacking defenses. Remember the mnemonic “SHIELD”: Secure flag, HttpOnly flag, ID regeneration, Expiration, and Logout enforcement.
This CAS-004 practice question tests your understanding of application environment, configuration 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.
A security analyst is reviewing a web application's authentication mechanism. Which of the following are best practices to prevent session hijacking? (Select TWO.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Set the session timeout to 5 minutes
Why wrong: Short timeouts reduce risk but do not prevent hijacking; they are a mitigation, not a prevention.
Use the same session ID before and after authentication
Why wrong: Using the same session ID allows session fixation attacks.
Store session tokens in localStorage
Why wrong: localStorage is accessible by JavaScript and vulnerable to XSS; cookies with HttpOnly flag are more secure.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Regenerate session ID upon successful login
Regenerating the session ID upon successful login (option A) is a critical defense against session fixation attacks, where an attacker forces a known session ID on a user before authentication. By issuing a new, server-generated session ID after login, the application ensures that any pre-authentication session ID controlled by an attacker becomes invalid. This practice is recommended by OWASP and aligns with RFC 6265 session management guidelines.
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.
Set the session timeout to 5 minutes
Why it's wrong here
Short timeouts reduce risk but do not prevent hijacking; they are a mitigation, not a prevention.
Use the same session ID before and after authentication
Why it's wrong here
Using the same session ID allows session fixation attacks.
Store session tokens in localStorage
Why it's wrong here
localStorage is accessible by JavaScript and vulnerable to XSS; cookies with HttpOnly flag are more secure.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CAS-004 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is wrong here
Short timeouts reduce risk but do not prevent hijacking; they are a mitigation, not a prevention.
Why this is wrong here
Using the same session ID allows session fixation attacks.
Why this is wrong here
localStorage is accessible by JavaScript and vulnerable to XSS; cookies with HttpOnly flag are more secure.
Analysis generated from the official CAS-004blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Cisco often tests the misconception that short session timeouts (like 5 minutes) are a primary defense against session hijacking, when in fact they are a secondary mitigation that can harm usability, while the core technical controls are session ID regeneration and cookie security flags.
Detailed technical explanation
Under the hood, session hijacking often leverages predictable session IDs or fixation via URL parameters. Regenerating the ID after authentication (e.g., using `session_regenerate_id()` in PHP or `request.getSession().invalidate()` in Java) creates a new server-side session binding, invalidating the old one. The Secure flag ensures cookies are only sent over HTTPS, while HttpOnly prevents JavaScript access via `document.cookie`, mitigating XSS-based token theft — both flags are defined in RFC 6265 and enforced by modern browsers.
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 CAS-004 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Application Environment, Configuration and Security — study guide chapter
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FAQ
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
The correct answer is: Regenerate session ID upon successful login — Regenerating the session ID upon successful login (option A) is a critical defense against session fixation attacks, where an attacker forces a known session ID on a user before authentication. By issuing a new, server-generated session ID after login, the application ensures that any pre-authentication session ID controlled by an attacker becomes invalid. This practice is recommended by OWASP and aligns with RFC 6265 session management guidelines.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CAS-004 practice question is part of Courseiva's free CompTIA 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 CAS-004 exam.
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