CCSM Advanced VPN Troubleshooting Practice Question
An administrator notices intermittent VPN tunnel drops between two Security Gateways. Phase 2 negotiations fail every 3600 seconds precisely. Which parameter mismatch most likely causes this behavior?
⚠ Common exam trap
Candidates often mistake Phase 2 lifetime mismatches for Phase 1 IKE negotiation errors. They focus on authentication methods rather than the specific timers that trigger periodic key renegotiation cycles.
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
✓
Mismatched Phase 2 key lifetime configurations causing premature expiration.
Phase 2 renegotiation failures usually stem from mismatched lifetime settings between the peers. If one gateway expects a rekey before the other initiates it, a race condition drops the security association. Verifying encryption domain and lifetime values ensures continuous secure data transmission without unexpected disconnections in enterprise environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Different Diffie-Hellman group numbers configured in Phase 1 properties.
Why it's wrong here
Diffie-Hellman group mismatches prevent the initial establishment of Phase 1 Internet Key Exchange security associations. When this parameter differs, the peers cannot even begin negotiating encryption keys, resulting in a completely failed tunnel rather than intermittent drops after a specific time interval.
- ✓
Mismatched Phase 2 key lifetime configurations causing premature expiration.
Why this is correct
Differing lifetime configurations cause one peer to expire and delete the security association before the other peer attempts a rekey. This desynchronization breaks traffic flow precisely at the expiration interval until manual or triggered recovery occurs across the gateways.
- ✗
Incompatible pre-shared secret keys defined on the remote access profile.
Why it's wrong here
Incompatible pre-shared secrets cause authentication failures immediately when establishing the tunnel. Authentication happens during early Phase 1 processing, meaning incorrect secrets prevent any connection rather than allowing stable traffic for an exact duration of time.
- ✗
Disabled NAT traversal on one of the participating Security Gateways.
Why it's wrong here
Disabled NAT traversal prevents successful key exchange when intermediary devices perform port address translation. This causes connection failure right at the beginning of the handshake process, failing consistently rather than dropping predictably after thirty-six hundred seconds of operation.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Check Point exam blueprint
This CCSM practice question is part of Courseiva's free Check Point 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 CCSM exam.