The correct answer is that using the latest library version reduces the attack surface by patching known vulnerabilities. This is the primary security benefit because outdated libraries are a common vector for exploits; each new version typically includes fixes for security flaws discovered in prior releases, closing those gaps before attackers can leverage them. On the CISSP exam, this question tests your understanding of the Software Development Security domain, specifically secure coding practices and supply chain risk management. A common trap is confusing operational benefits like backward compatibility or performance gains with the core security objective—patching is the priority, not new features. Remember the mnemonic: “Patch First, Feature Last” to keep your focus on vulnerability reduction when evaluating library updates.
CISSP Software Development Security Practice Question
This CISSP practice question tests your understanding of software development 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 development team is integrating a third-party library for encryption. The security team insists on using only the latest version of the library. What is the primary security benefit of this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reduces the attack surface by patching known vulnerabilities.
Option C is correct because using the latest version ensures that known vulnerabilities in older versions are patched. Option A is wrong because backward compatibility is not the primary security benefit. Option B is wrong because newer versions may introduce new features but can also break compatibility. Option D is wrong because performance improvements are secondary to security.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Improves performance due to optimized code.
Why it's wrong here
Performance improvements are possible but not the primary security driver.
✗
Ensures the library has more features than older versions.
Why it's wrong here
While newer versions may have more features, the primary benefit is patching vulnerabilities.
✓
Reduces the attack surface by patching known vulnerabilities.
Why this is correct
The latest version includes fixes for vulnerabilities discovered in prior versions.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Guarantees backward compatibility with existing code.
Why it's wrong here
Backward compatibility is a compatibility concern, not the primary security benefit.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISSP NAT questions on configuration and troubleshooting.
Software Development Security — This question tests Software Development Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Reduces the attack surface by patching known vulnerabilities. — Option C is correct because using the latest version ensures that known vulnerabilities in older versions are patched. Option A is wrong because backward compatibility is not the primary security benefit. Option B is wrong because newer versions may introduce new features but can also break compatibility. Option D is wrong because performance improvements are secondary to security.
What should I do if I get this CISSP question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISSP NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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