- A
Use AES encryption with a minimum key size of 128 bits
AES-128 is a strong, recommended encryption algorithm for IPsec.
- B
Use pre-shared keys for authentication
Why wrong: Pre-shared keys are weaker and harder to manage than certificate-based authentication.
- C
Disable anti-replay protection to improve performance
Why wrong: Anti-replay protection is a critical security function and should never be disabled.
- D
Enable Perfect Forward Secrecy (PFS)
PFS ensures session keys are not derived from long-term keys, so compromise of one session key does not compromise future sessions.
- E
Allow all IP protocols through the VPN tunnel
Why wrong: Allowing all protocols expands the attack surface; only necessary protocols should be permitted.
Question 376 of 1,000
mediumMultiple SelectObjective-mapped
SSCP Practice Question: Is implementing a new remote access VPN for…
This SSCP practice question tests your understanding of sscp exam topics. 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 organization is implementing a new remote access VPN for employees using IPsec. Which TWO of the following are best practices for securing the IPsec VPN?
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.
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
✓
Use AES encryption with a minimum key size of 128 bits
AES encryption with a minimum key size of 128 bits is a best practice for IPsec VPNs because it provides strong, symmetric encryption that is resistant to known cryptographic attacks. AES-128 is approved by NIST and widely considered secure for protecting sensitive data over untrusted networks like the internet.
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.
- ✓
Use AES encryption with a minimum key size of 128 bits
Why this is correct
AES-128 is a strong, recommended encryption algorithm for IPsec.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use pre-shared keys for authentication
Why it's wrong here
Pre-shared keys are weaker and harder to manage than certificate-based authentication.
- ✗
Disable anti-replay protection to improve performance
Why it's wrong here
Anti-replay protection is a critical security function and should never be disabled.
- ✓
Enable Perfect Forward Secrecy (PFS)
Why this is correct
PFS ensures session keys are not derived from long-term keys, so compromise of one session key does not compromise future sessions.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Allow all IP protocols through the VPN tunnel
Why it's wrong here
Allowing all protocols expands the attack surface; only necessary protocols should be permitted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse pre-shared keys as a secure authentication method for IPsec, but the SSCP exam emphasizes that PSKs are weak compared to digital certificates or EAP methods, especially in enterprise environments.
Detailed technical explanation
How to think about this question
Perfect Forward Secrecy (PFS) ensures that if a long-term private key is compromised, past session keys cannot be derived because each session uses ephemeral Diffie-Hellman (DH) keys that are not stored. In IPsec, PFS is enabled by setting the 'pfs' parameter in the IKE phase 2 policy, which forces a new DH exchange for each Quick Mode negotiation, typically using DH groups 14 (2048-bit) or higher for strong security.
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 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.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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.
Related practice questions
Related SSCP practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Access Controls practice questions
Practise SSCP questions linked to Access Controls.
Risk Identification, Monitoring, and Analysis practice questions
Practise SSCP questions linked to Risk Identification, Monitoring, and Analysis.
Incident Response and Recovery practice questions
Practise SSCP questions linked to Incident Response and Recovery.
Security Operations and Administration practice questions
Practise SSCP questions linked to Security Operations and Administration.
Cryptography practice questions
Practise SSCP questions linked to Cryptography.
Network and Communications Security practice questions
Practise SSCP questions linked to Network and Communications Security.
Systems and Application Security practice questions
Practise SSCP questions linked to Systems and Application Security.
Risk Identification, Monitoring and Analysis practice questions
Practise SSCP questions linked to Risk Identification, Monitoring and Analysis.
SSCP fundamentals practice questions
Practise SSCP questions linked to SSCP fundamentals.
SSCP scenario practice questions
Practise SSCP questions linked to SSCP scenario.
SSCP troubleshooting practice questions
Practise SSCP questions linked to SSCP troubleshooting.
Practice this exam
Start a free SSCP practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this SSCP question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Use AES encryption with a minimum key size of 128 bits — AES encryption with a minimum key size of 128 bits is a best practice for IPsec VPNs because it provides strong, symmetric encryption that is resistant to known cryptographic attacks. AES-128 is approved by NIST and widely considered secure for protecting sensitive data over untrusted networks like the internet.
What should I do if I get this SSCP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More SSCP practice questions
- A company has implemented a new vulnerability scanner and the first scan reports 200 vulnerabilities. The security team…
- A security analyst is reviewing logs and notices multiple failed login attempts from a single IP address against an admi…
- A security manager is evaluating log sources for a SIEM implementation. Which THREE of the following are considered log…
- A vulnerability scanner reports a medium-severity finding on a server. After investigation, the security team determines…
- During a qualitative risk analysis, an organization rates the likelihood of a flood as 'Low' and the impact as 'High'. U…
- A security analyst is tuning a SIEM to reduce false positives. Which of the following actions is most likely to reduce f…
Last reviewed: Jun 25, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.