What is the minimum number of CPU cores required to enable CoreXL?

CoreXL is a technology that improves the performance of the Security Gateway by utilizing multiple CPU cores for processing traffic. CoreXL creates multiple instances of the firewall kernel (fwk) that run in parallel on different CPU cores. The number of kernel instances can be configured using the cpconfig command on the Security Gateway3. The minimum number of CPU cores required to enable CoreXL is 2, as one core is reserved for SND (Secure Network Distributor) and one core is used for running a kernel instance4. If the Security Gateway has only one CPU core, CoreXL cannot be enabled. Therefore, the correct answer is C.

References: 3: CoreXL Administration Guide 4: [CoreXL Frequently Asked Questions (FAQ)]