156-315.81.20 Performance Tuning (SecureXL/CoreXL) Practice Question
Which feature must be enabled on the network interface to allow SecureXL to distribute the processing load across multiple CPU cores effectively?
⚠ Common exam trap
Candidates often confuse Multi-Queue with CoreXL itself, assuming that enabling CoreXL automatically enables the NIC-level queue distribution required for effective hardware acceleration and parallel processing.
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
✓
Multi-Queue
Multi-Queue is the essential technology that allows the network interface card (NIC) to spread incoming traffic across multiple receive queues. Without Multi-Queue, all traffic would arrive at a single CPU core, negating the benefits of CoreXL. Enabling Multi-Queue ensures that the gateway can handle higher concurrent traffic loads, as each queue can be assigned to a different processing core, maximizing the total throughput capacity of the system.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VLAN Tagging
Why it's wrong here
VLAN tagging is a method for network segmentation and traffic isolation. While commonly used in production environments, it is independent of core distribution and acceleration. VLANs do not assist in load distribution across CPU cores and are handled by the driver independently of the acceleration engine.
- ✓
Multi-Queue
Why this is correct
Multi-Queue allows the physical NIC to distribute ingress traffic across multiple CPU cores. This is a fundamental prerequisite for effective CoreXL operation, as it allows the gateway to process packets in parallel rather than being bottlenecked by a single interface interrupt handling core.
- ✗
Dynamic Routing
Why it's wrong here
Dynamic routing protocols like OSPF or BGP manage path selection for packets. They have no impact on the internal distribution of packets to CPU cores for inspection. Routing is a layer 3 function, whereas core distribution is a system-level hardware and kernel optimization mechanism.
- ✗
Jumbo Frames
Why it's wrong here
Jumbo Frames increase the maximum transmission unit (MTU) size, which can improve throughput for large data transfers by reducing overhead. However, they do not facilitate the distribution of traffic across multiple CPU cores, which is the specific purpose of the Multi-Queue feature in performance tuning.
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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
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