156-315.81.20 Performance Tuning (SecureXL/CoreXL) Practice Question
Exhibit
fwaccel stats IPv4: 1234567 Drop: 0 F2F: 987654 Accel: 25012
Refer to the exhibit. An administrator is analyzing SecureXL performance and sees a high number of F2F (Firewall-to-Fastpath) packets. What is the most likely reason for this performance pattern?
⚠ Common exam trap
Many candidates confuse F2F packets with hardware failures or network interface drops, failing to realize that high Firewall-to-Fastpath traffic simply indicates packets hitting unsupported features that prevent template matching.
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
✓
The traffic contains unsupported features that prevent template acceleration
F2F packets indicate traffic is being processed by the Firewall kernel because it cannot be fully accelerated by the SecureXL template. When traffic hits the firewall repeatedly without matching a template, overhead increases significantly. This is critical because it implies that the SecureXL acceleration path is failing to offload certain traffic patterns, causing the CPU to work harder than necessary for connections that should be offloaded for high-speed performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SecureXL is disabled globally
Why it's wrong here
If SecureXL were globally disabled, the accelerated packet count would be zero, and F2F processing would not be the primary metric. The existence of accelerated packets suggests SecureXL is active, but the high F2F count implies that specific traffic flows are falling back to the slow path.
- ✓
The traffic contains unsupported features that prevent template acceleration
Why this is correct
Features like complex NAT, certain inspection types, or protocol limitations prevent SecureXL from creating templates. Consequently, the first packet of a connection is processed by the firewall, and subsequent packets follow the same path, resulting in high F2F counts rather than reaching the accelerated fastpath.
- ✗
CoreXL is disabled
Why it's wrong here
CoreXL handles multi-core distribution and is independent of the SecureXL acceleration path. Disabling CoreXL would impact how the Firewall kernel handles packets across cores but would not specifically cause a high volume of F2F packets, which is a metric specifically related to the SecureXL offloading mechanism.
- ✗
The NIC drivers are incompatible
Why it's wrong here
Incompatible drivers typically cause severe system instability, packet drops, or link negotiation failures rather than causing specific traffic to consistently fall back to the firewall slow path. SecureXL would generally function or fail entirely if the driver level were the root cause of the throughput issue.
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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 156-315.81.20 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 156-315.81.20 exam.