156-315.81.20 Performance Tuning (SecureXL/CoreXL) Practice Test 2 — 15 Questions

Question 1

A security administrator is troubleshooting a performance issue on an R81 Security Gateway. The gateway has 8 cores, CoreXL is enabled with 6 firewall instances, and SecureXL is enabled. The administrator notices that most traffic is being handled by the slow path, and the fast path counters are very low. Which action would most likely increase the volume of traffic accelerated by SecureXL?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Enable the 'SecureXL Templates' feature to accelerate connections that match existing templates.. SecureXL Templates accelerate new connections that are similar to already-accelerated connections. When fast-path counters are low, enabling templates can dramatically increase the proportion of traffic that is offloaded. The other options either disable essential components or address slow-path parallelism, which does not directly increase SecureXL acceleration.

Answer

Increase the number of firewall instances to equal the number of CPU cores.

Answer

Disable CoreXL to allow SecureXL to use all CPU cores.

Answer

Disable the 'fwaccel' process to reduce CPU load and allow more resources for SecureXL.

Question 2

A security administrator is troubleshooting a performance issue on an R81 Security Gateway. The gateway has 8 cores, CoreXL is enabled with 6 firewall instances, and SecureXL is enabled. The administrator notices that most traffic is being handled by the slow path, and the fast path counters are very low. Which action would most likely increase the volume of traffic accelerated by SecureXL?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

The connections are part of a session that requires the 'ftp' security server, which forces the traffic to be handled by the firewall kernel.. Connections that require a security server, such as FTP, are not accelerated by SecureXL because the firewall must inspect the application-layer protocol to manage dynamic ports and commands. This results in packets being processed in the kernel (PXL path), which explains the high PXL count. Other factors like CoreXL load or VPN do not prevent acceleration for FTP traffic. The correct answers highlight the fundamental limitation of SecureXL regarding protocol handlers.

Answer

The connections are using IPsec VPN, which is not accelerated by SecureXL unless the 'Accelerate VPN' option is enabled.

Answer

The connections are being handled by a Security Policy rule that requires a resource with a 'Drop' action, such as a rule with a 'Limit' action.

Answer

The connections are being processed by a CoreXL firewall instance that is overloaded, causing SecureXL to fall back to the slow path.

Question 3

A security administrator is tuning a 16-core R81.20 Security Gateway that handles a mix of plaintext HTTP and heavily inspected HTTPS traffic. The administrator wants to confirm which traffic paths are being handled by SecureXL rather than by the Firewall Kernel. Which command should the administrator run to display the current SecureXL acceleration statistics per connection type?

Accepted Answer

fwaccel stats -s. SecureXL acceleration visibility is provided by the fwaccel toolset. The stats view specifically reports accelerated versus non-accelerated traffic and the associated reasons, which is exactly what is needed to confirm handling of mixed HTTP and HTTPS flows. Policy status, CoreXL heavy-core output, and generic interface counters do not expose SecureXL path decisions.

Answer

netstat -ani | grep -i sxl

Answer

cpstat fw -f policy

Answer

fw ctl multik print_heavy_cores

Question 4

An administrator is analyzing performance on a Check Point R81 Security Gateway with 16 cores. CoreXL is enabled with 10 firewall instances, and SecureXL is enabled. The administrator observes that CPU utilization is uneven: some cores are near 100% while others are underutilized. Which command would best help diagnose whether SecureXL is properly distributing traffic across all cores?

Accepted Answer

fwaccel stat -c. To diagnose whether SecureXL is distributing traffic across all cores, the administrator needs per-core SecureXL statistics. The 'fwaccel stat -c' command provides exactly that, showing acceleration counts per core. Other commands either give overall statistics, configuration details, or general CPU usage without SecureXL-specific per-core breakdown.

Answer

cpstat -f multi_cpu

Answer

fwaccel stats -s

Answer

fw ctl multik print_cores

Question 5

An administrator is tuning a Security Gateway with SecureXL and CoreXL. The administrator wants to ensure that the gateway is optimally configured for high throughput. Which TWO of the following statements are true regarding SecureXL and CoreXL? (Choose two.)

Accepted Answer

CoreXL distributes traffic across multiple CPU cores using a hashing algorithm based on source and destination IP addresses.. CoreXL uses a hashing algorithm based on source and destination IP addresses to distribute connections across multiple firewall instances, improving parallel processing. SecureXL templates accelerate traffic that matches certain patterns, such as HTTP or FTP, by offloading them to the fast path. These two features work together to enhance performance. The other statements are false: SecureXL does not accelerate VPN traffic by default, SecureXL and CoreXL are not mutually exclusive, and the number of CoreXL instances is not always equal to the number of cores.

Answer

The number of CoreXL firewall instances should be equal to the number of CPU cores for maximum performance.

Answer

SecureXL must be disabled when CoreXL is enabled to avoid conflicts.

Answer

SecureXL can accelerate VPN traffic without any additional configuration.

Question 6

An administrator is reviewing SecureXL acceleration on an R81 Security Gateway. Which two of the following scenarios would typically prevent a connection from being accelerated by SecureXL? (Choose two.)

Accepted Answer

The connection requires NAT with port address translation (PAT) using a pool of addresses.. SecureXL cannot accelerate connections that require deep packet inspection or dynamic NAT with port translation. These require stateful inspection and dynamic decisions that only the slow path can handle. Other scenarios like Security Zones, IPsec VPN, or locally originated traffic either do not prevent acceleration or are outside SecureXL's scope.

Answer

The connection is encrypted with IPsec and the gateway is the VPN peer.

Answer

The connection is initiated from the gateway itself (e.g., a local process).

Answer

The connection is subject to a rule that includes a Security Zone object in the Source field.

Question 7

A security administrator is reviewing why certain connections on an R81.20 Security Gateway are not being accelerated by SecureXL. The administrator has confirmed that SecureXL is enabled and the interfaces support multi-queue. Which two conditions would typically prevent a connection from being handled in the accelerated path? (Choose two.)

Accepted Answer

The connection requires deep inspection by a Software Blade that is incompatible with the accelerated path, such as a content-aware threat prevention inspection.. Connections bypass SecureXL acceleration when their processing requires capabilities the accelerated path cannot provide. Deep inspection by blades incompatible with acceleration and NAT scenarios requiring unsupported translation are two common triggers. Management version differences and logging-only rules do not, by themselves, exclude a connection from the accelerated path.

Answer

The connection originates from a source whose address is included in a group used by a rule that only logs traffic.

Answer

The gateway is managed by a Security Management Server that is running a different major version than the gateway.

Answer

The connection's first packet was dropped by the implicit clean-up rule before any template could be created for it.

Question 8

An administrator is analyzing the performance of a Security Gateway with CoreXL enabled. The administrator notices that one CPU core is consistently at 100% utilization while others are lower. Which of the following is the most likely cause?

Accepted Answer

The CoreXL instance count is misconfigured, causing an uneven distribution of traffic.. Uneven CPU utilization in a CoreXL-enabled gateway is often due to suboptimal distribution of traffic across firewall instances. This can happen if the number of instances is not correctly set, or if the hashing algorithm results in an uneven load because of traffic patterns. The administrator should check the CoreXL instance count and consider using dynamic load balancing or adjusting the hash. Other options, such as a single source IP, are possible but less likely without additional context. A faulty core is unlikely given the symptom.

Answer

The CPU core is faulty and needs to be replaced.

Answer

SecureXL is disabled, causing all traffic to be processed by a single core.

Answer

The gateway is experiencing a high number of connections from a single source IP, causing all traffic to be hashed to the same core.

Question 9

An administrator is tuning a Check Point Security Gateway with SecureXL enabled. The administrator observes that certain traffic is not being accelerated, leading to higher CPU usage. Which two of the following conditions would cause SecureXL to bypass acceleration for a connection? (Choose two.)

Accepted Answer

The connection involves a protocol that uses dynamic ports, such as FTP.. SecureXL bypasses acceleration for traffic that requires deep packet inspection, encryption, or dynamic state handling. IPsec VPN traffic must be encrypted and decrypted, which SecureXL cannot offload, so it is handled by the Firewall Kernel. Protocols like FTP that use dynamic ports require the firewall to inspect the control channel and create pinholes, which also prevents acceleration. Both conditions force the traffic through the Firewall Kernel path, increasing CPU usage. Simple UDP flows and connections with Notify actions can still be accelerated.

Answer

The connection is using TCP port 443 with HTTPS inspection enabled.

Answer

The connection is a simple UDP flow with no inspection.

Answer

The connection is subject to a rule with a 'Notify' action.

Question 10

An administrator is configuring a new R81 Security Gateway with SecureXL and CoreXL enabled. The administrator wants to ensure that SecureXL acceleration is optimized for the traffic profile. Which TWO of the following statements are true regarding SecureXL and its interaction with CoreXL? (Choose two.)

Accepted Answer

SecureXL uses templates to accelerate the creation of new connections, reducing the load on CoreXL instances.. SecureXL and CoreXL work together to optimize performance. SecureXL accelerates eligible packets before they reach CoreXL, so accelerated traffic bypasses the firewall instances. Templates further enhance acceleration by speeding up new connection setup. The number of CoreXL instances does not directly affect SecureXL, but both are part of the overall performance architecture.

Answer

SecureXL can accelerate connections that are handled by CoreXL firewall instances after they are established.

Answer

CoreXL must be disabled for SecureXL to function properly.

Answer

The number of CoreXL firewall instances can affect the performance of SecureXL acceleration.

Question 11

A Check Point R81 Security Gateway has 12 cores. CoreXL is enabled with 8 firewall instances, and SecureXL is active. The administrator notices that the 'fw multik' process is consuming a high amount of CPU. Which action would most effectively reduce the CPU load of the 'fw multik' process while maintaining performance?

Accepted Answer

Enable SecureXL Templates to offload more connections to the fast path.. The 'fw multik' process handles slow-path traffic. To reduce its CPU load, the best approach is to offload more traffic to the fast path via SecureXL. Enabling SecureXL Templates increases the percentage of connections that can be accelerated, thereby reducing the load on the 'fw multik' process. The other options either do not directly reduce the load or could worsen performance.

Answer

Reduce the number of CoreXL firewall instances to 4.

Answer

Disable CoreXL and rely solely on SecureXL for acceleration.

Answer

Increase the number of CoreXL firewall instances to 12.

Question 12

An administrator is managing a Check Point Security Gateway with SecureXL enabled. The administrator notices that certain connections are not being accelerated, and the 'fwaccel stats' output shows a high number of F2F packets. The administrator suspects that a specific feature is causing the traffic to bypass SecureXL. Which of the following features, when applied to a connection, would prevent SecureXL from accelerating it?

Accepted Answer

IPsec VPN. SecureXL cannot accelerate traffic that requires IPsec VPN processing because encryption and decryption must be done by the firewall kernel. Other features like NAT with port translation and deep inspection can also cause F2F, but IPsec VPN is a definitive blocker. The administrator should check if VPN is configured on the gateway and consider offloading VPN processing to a dedicated appliance if performance is impacted.

Answer

Static NAT with no port translation

Answer

Antivirus inspection

Answer

Quality of Service (QoS) enforcement

Question 13

An administrator is tuning a Check Point Security Gateway with 16 CPU cores. CoreXL is enabled with 12 firewall instances, and SecureXL is active. The administrator observes that the 'fwaccel' process is consuming a high amount of CPU. Which of the following is the most likely reason for this high CPU usage by the 'fwaccel' process?

Accepted Answer

The SecureXL driver is processing a high rate of accelerated traffic.. The 'fwaccel' process is part of SecureXL and is responsible for managing accelerated connections. When a high volume of traffic is being accelerated, the SecureXL driver must process each packet, which can lead to increased CPU usage in the 'fwaccel' process. This is a sign that SecureXL is actively offloading traffic, but if the rate is too high, it may become a bottleneck. Administrators should monitor the acceleration rate and consider whether the CPU resources allocated to SecureXL are sufficient, or if traffic patterns need adjustment.

Answer

CoreXL is configured with too many instances, causing contention.

Answer

The 'fwaccel' process is responsible for logging all accelerated connections.

Answer

SecureXL is handling a large number of non-accelerated connections.

Question 14

Which command is used to verify the current status of SecureXL on a Check Point Security Gateway?

Accepted Answer

fwaccel stat. The command 'fwaccel stat' is the standard utility used to confirm whether SecureXL is enabled and to view its current operational state. Verifying this is the first step in troubleshooting performance issues. If SecureXL is disabled, the system will not perform hardware-assisted packet processing, leading to significantly lower throughput and higher latency, making this command essential for every performance tuning or troubleshooting session performed on the gateway.

Answer

cpconfig

Answer

cphaprob stat

Answer

sim stat

Question 15

An administrator is troubleshooting a performance issue and identifies that packet drops are occurring in the SecureXL layer. Which command should they use to troubleshoot packet drops specifically related to the acceleration layer?

Accepted Answer

fwaccel stats -d. The 'fwaccel stats -d' command provides detailed statistics about packets that were dropped by the SecureXL module. Identifying why packets are dropped at the acceleration layer is crucial for performance tuning. These drops often indicate policy mismatches, fragmented packets, or unsupported features. By pinpointing these drops, administrators can adjust their security policies or acceleration templates to allow traffic to pass through the fast path instead of being blocked.

Answer

fw ctl debug

Answer

cpstat fw -p

Answer

netstat -s