CCSM Advanced Firewall Troubleshooting Practice Test 3 — 15 Questions

Question 1

A Security Gateway is experiencing high CPU usage. The administrator suspects that a specific traffic pattern is causing excessive logging. Which command can be used to identify the top logging sources in real-time?

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

Accepted Answer

fw log -n -f | awk '{print $6}' | sort | uniq -c | sort -rn | head. To identify top logging sources, the administrator needs to aggregate log entries by source IP and count occurrences. The combination of fw log, awk, sort, uniq, and head provides a real-time summary of the most frequent log sources. This allows quick identification of the problematic traffic pattern.

Answer

fw ctl zdebug + log

Answer

fw log -f -t

Answer

cpstat fw -f log

Question 2

An administrator is troubleshooting a cluster where one member is consistently failing to synchronize its connection table with the other member. The administrator has verified that the sync network is operational and that the cluster is in a healthy state. Which command should be used to check the status of the ClusterXL synchronization and to view detailed information about the synchronization process?

Accepted Answer

cphaprob sync. The cphaprob sync command is specifically designed to report on the ClusterXL synchronization status, showing whether synchronization is active, the sync interface details, and any errors encountered. When a member fails to synchronize its connection table, this command will reveal if the sync process is experiencing problems, such as packet loss or misconfiguration, enabling the administrator to take corrective action.

Answer

fw ctl pstat

Answer

cphaprob syncstat

Answer

cphaprob -a if

Question 3

An administrator is troubleshooting a performance issue where the firewall is experiencing high CPU utilization. The administrator suspects that a specific process is causing the problem. Which command should be used to identify the top CPU-consuming processes on a Check Point Security Gateway?

Accepted Answer

ps aux --sort=-%cpu | head. The correct command is ps aux --sort=-%cpu | head, which lists processes sorted by CPU usage, quickly revealing the top consumers. This is a standard Linux command that works on Check Point gateways. Other commands provide overall CPU stats or internal firewall statistics but lack per-process CPU breakdown, making them unsuitable for identifying a specific high-CPU process.

Answer

fw ctl pstat

Answer

cpstat os -f cpu

Answer

top -H

Question 4

An administrator is troubleshooting a Check Point Security Gateway that is experiencing intermittent connectivity issues. The administrator suspects that the problem is related to the firewall's handling of fragmented packets. Which two actions should the administrator take to diagnose and resolve the issue? (Choose two.)

Accepted Answer

Enable IP fragmentation debugging using fw ctl zdebug + frag.. The correct actions are to enable fragmentation debugging with fw ctl zdebug + frag to see how fragments are handled, and to check Global Properties to ensure that fragmented packets are not being dropped if they should be allowed. These steps directly diagnose and resolve fragmentation-related connectivity issues. Other options either use unsupported filters, lack specific fragmentation data, or are premature optimizations.

Answer

Inspect the 'fw ctl pstat' output for fragmentation statistics and errors.

Answer

Adjust the MTU size on the firewall interfaces to prevent fragmentation.

Answer

Use fw monitor to capture only fragmented packets by applying the filter 'frag'.

Question 5

A Check Point Security Gateway R81.10 is experiencing intermittent connectivity issues for VoIP traffic. The administrator suspects that the firewall is dropping packets due to a specific inspection issue. The administrator runs 'fw ctl zdebug drop' and sees drops with the reason 'voip_allow_rtp'. Which of the following is the most likely cause for these drops?

Accepted Answer

The VoIP domain objects are not correctly configured, causing the firewall to drop RTP packets that do not match the expected signaling.. The drop reason 'voip_allow_rtp' is generated by the VoIP inspection engine when it cannot match an RTP packet to a signaled media stream. This usually happens when VoIP domain objects are not properly configured, so the firewall does not know which RTP ports to open. Correcting the VoIP domain configuration allows the firewall to dynamically allow the RTP streams, resolving the drops.

Answer

The firewall's SecureXL acceleration is disabled, causing RTP packets to be processed by the slow path and dropped.

Answer

The RTP packets are being dropped because the firewall's rulebase does not include a rule allowing RTP traffic from the VoIP provider.

Answer

The firewall is dropping RTP packets because the SIP signaling was not inspected due to a malformed SIP message.

Question 6

A Check Point administrator is troubleshooting a performance issue where VoIP traffic is experiencing jitter and packet loss across a cluster. The administrator suspects that the issue is related to how the cluster handles connections. Which two actions should the administrator take to verify and potentially resolve the issue? (Choose two.)

Accepted Answer

Verify that 'Sticky Connections' are enabled in the cluster object properties to ensure VoIP traffic remains on the same member.. The correct actions are to verify that Sticky Connections are enabled and to consider changing the cluster load balancing mode to High Availability. These steps address the root cause of VoIP jitter in a cluster, which is often related to related connections being distributed across different members. Sticky Connections ensures session affinity, while High Availability mode provides a single active member for all traffic, eliminating distribution issues.

Answer

Run 'fw ctl multik get_mode' to check if Multi-Queue is enabled and adjust if necessary.

Answer

Use 'fw monitor' to capture VoIP packets and analyze if they are being fragmented.

Answer

Run 'cpstat -f voip' to get real-time VoIP statistics and identify the problematic codec.

Question 7

An administrator is using 'fw monitor' to troubleshoot a connectivity issue. They notice that packets are being captured at the 'i' (inbound) and 'I' (post-inbound) inspection points, but not at the 'o' (outbound) or 'O' (post-outbound) points. What is the most likely explanation for this behavior?

Accepted Answer

The packets are being routed to a different interface than expected due to a routing table issue.. The absence of packets at outbound inspection points while present at inbound suggests the firewall is not forwarding them out the expected interface. This is often due to a routing decision that sends the packet elsewhere or drops it. While policy drops or anti-spoofing could cause similar symptoms, a routing issue is a more precise explanation for why packets are not seen at outbound points. The other options either contradict the observation or are less specific.

Answer

The packets are being dropped by the firewall's anti-spoofing mechanism.

Answer

The 'fw monitor' filter is incorrectly configured to capture only inbound traffic.

Answer

The packets are being dropped by the firewall's policy, and the drop is logged.

Question 8

A Check Point administrator is troubleshooting a ClusterXL issue where failover is not occurring as expected. The administrator needs to verify the cluster status and identify which member is active. Which two commands should the administrator use to check the cluster status and the state of each member? (Choose two.)

Accepted Answer

cphaprob stat. cphaprob stat shows the overall cluster status and which member is active, while cphaprob -a if displays the status of monitored interfaces. Together, they provide a comprehensive view of ClusterXL health and help identify why failover might not be occurring. Other commands like fw ctl pstat and cpstat ha do not offer the same level of detail for cluster member states.

Answer

fw ctl pstat

Answer

cpstat ha

Answer

clusterXL_admin status

Question 9

An administrator needs to view the current number of connections and the peak number of connections on a Security Gateway. Which command provides this information?

Accepted Answer

fw tab -t connections -s. The fw tab -t connections -s command is the correct way to view connection table statistics, including current and peak connection counts. It queries the firewall's internal connection table, which is the authoritative source for stateful connections. The other options either use incorrect syntax or do not access the firewall's connection table, making them unsuitable for this task.

Answer

netstat -an | grep ESTABLISHED | wc -l

Answer

fw ctl conns

Answer

cpstat -f connections

Question 10

An administrator is troubleshooting why a firewall rule that should allow HTTP traffic from a specific internal subnet to an external web server is not working. The administrator runs 'fw ctl zdebug + drop' and sees the message 'dropped by fw_log: rule 12'. What is the most likely explanation for this drop?

Accepted Answer

The traffic is being dropped by rule 12, which is configured with a 'Drop' action and logging enabled, and the drop is being logged.. The correct answer is that rule 12 is configured with a 'Drop' action and logging, causing the traffic to be dropped and logged. The message 'dropped by fw_log: rule 12' directly indicates that rule 12 is responsible for the drop. The administrator should examine rule 12 in the security policy to understand why it matches the traffic before the intended allow rule, possibly due to rule order or a misconfiguration.

Answer

The traffic is being dropped by a rule that is logging the drop, and rule 12 is the explicit drop rule.

Answer

The traffic is being dropped by an implicit drop rule, and rule 12 is the rule number of the logging action.

Answer

The traffic is being dropped because of a logging configuration issue, and rule 12 is the rule that should have allowed it.

Question 11

A Check Point administrator is investigating why a new rule allowing HTTP traffic from a specific subnet is not being matched. The administrator runs 'fw monitor' and sees that packets are passing the inbound chain but not the outbound chain. Which of the following is the most likely reason for this behavior?

Accepted Answer

The firewall is dropping the packets because the destination is not reachable according to the routing table.. When packets pass the inbound chain but not the outbound chain in fw monitor, it typically means the firewall accepted the packet but could not forward it due to a routing issue. The firewall evaluates the rulebase in the inbound chain; if accepted, it then routes the packet. If no route exists, the packet is dropped after inbound inspection, explaining the absence in the outbound chain. Checking and correcting the routing table resolves this.

Answer

The packets are being dropped by the firewall's anti-spoofing mechanism before the outbound chain.

Answer

The packets are being dropped because the rulebase does not have a matching rule for the outbound direction.

Answer

The packets are being dropped by the firewall's SecureXL acceleration path, which bypasses the outbound chain.

Question 12

A security engineer has configured a Check Point Security Gateway to perform HTTPS inspection. Users report intermittent failures when accessing certain financial sites, but only from the branch office gateway, not the data center gateway. The branch gateway uses the same policy as the data center. The engineer suspects a SecureXL path issue. Which action should the engineer take to confirm whether SecureXL is bypassing the HTTPS inspection for these connections?

Accepted Answer

Run 'fwaccel conns | grep <client_ip>' and check the 'F' flag for the affected connections.. SecureXL can accelerate connections that are not eligible for HTTPS inspection, causing intermittent failures. The 'fwaccel conns' command lists accelerated connections and their flags; the absence of the 'F' flag indicates the connection is accelerated and bypassing the Firewall path. This directly confirms whether inspection is being skipped for the affected financial sites on the branch gateway.

Answer

Run 'fw monitor -e "accept src=<client_ip>;"' and look for the 'i' inspection point on the branch gateway.

Answer

Run 'cpstat fw -f policy' and review the 'Policy install time' field for the branch gateway.

Answer

Run 'fwaccel stats -s' and inspect the 'Accelerated' and 'Unaccelerated' counters for the affected traffic.

Question 13

A network administrator is troubleshooting a Check Point Security Gateway that is not passing traffic for a newly added subnet. The administrator runs 'fw monitor -e "host 10.10.10.5, accept;"' and sees packets at the 'i' (inbound) inspection point but not at the 'I' (post-inbound) inspection point. What is the most likely cause?

Accepted Answer

The packet is being dropped by the Security Policy before the post-inbound inspection point.. The 'i' inspection point is before the inbound chain, and 'I' is after. Seeing packets at 'i' but not 'I' means they are dropped during inbound processing, which includes Security Policy enforcement. This is the most likely cause, as the policy or another inbound inspection mechanism is blocking the traffic before it can proceed.

Answer

The packet is being dropped by the outbound chain after passing the post-inbound inspection point.

Answer

The packet is being dropped by SecureXL before reaching the inbound inspection point.

Answer

The packet is being dropped by the outbound chain after passing the inbound inspection.

Question 14

A Check Point Security Gateway is configured with CoreXL and is experiencing performance degradation. The administrator suspects that the CoreXL distribution is not optimal. Which two commands should the administrator use to verify the current CoreXL configuration and the distribution of traffic across fw_worker instances? (Choose two.)

Accepted Answer

'fw ctl multik print_off'. The 'fw ctl multik print_off' command shows per-instance CoreXL offload statistics, directly revealing how connections are distributed across fw_worker instances. The 'cpstat os -f multi_cpu' command provides per-CPU utilization, which helps identify if some cores are overloaded due to uneven CoreXL distribution. Together, these commands allow the administrator to verify both the configuration and the actual load distribution across workers.

Answer

'fwaccel stats -s'

Answer

'fw monitor -e "accept;"'

Answer

'cpinfo -z'

Question 15

An administrator notices that legitimate traffic is being dropped by the 'Cleanup' rule despite explicit allow rules existing higher in the policy. After verifying rule order, what is the most likely cause?

Accepted Answer

The traffic does not match the 'Service' column criteria of the higher allowed rules.. Implicit drop rules often trigger when traffic does not match the specific criteria defined in upper rules, such as source, destination, or service. In complex environments, rule shadowing or overly restrictive service definitions can cause traffic to fail matching higher rules. Understanding how the Security Gateway traverses the Rule Base is vital for identifying why packets fall through to the final cleanup rule instead of matching the intended security policy.

Answer

The Security Gateway is configured to use 'First Match' evaluation only.

Answer

The packet is being dropped due to a stateful inspection failure rather than a rule match failure.

Answer

The Security Gateway's SecureXL feature is corrupting the packet headers before policy evaluation.