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NSE4_FGT-7.0 · Question #37

Examine this FortiGate configuration: Examine the output of the following debug command: Based on the diagnostic outputs above, how is the FortiGate handling the traffic for new sessions that…

The correct answer is C. It is dropped. Based on the provided diagnostic output, new sessions requiring inspection are being dropped because the FortiGate is operating in conserve mode, which triggers a session drop for resource-intensive tasks.

Troubleshooting and Monitoring

Question

Examine this FortiGate configuration:

Examine the output of the following debug command:

Based on the diagnostic outputs above, how is the FortiGate handling the traffic for new sessions that require inspection?

Exhibit

NSE4_FGT-7.0 question #37 exhibit

Options

  • AIt is allowed, but with no inspection
  • BIt is allowed and inspected as long as the inspection is flow based
  • CIt is dropped.
  • DIt is allowed and inspected, as long as the only inspection required is antivirus.

How the community answered

(13 responses)
  • A
    8% (1)
  • B
    8% (1)
  • C
    62% (8)
  • D
    23% (3)

Why each option

Based on the provided diagnostic output, new sessions requiring inspection are being dropped because the FortiGate is operating in conserve mode, which triggers a session drop for resource-intensive tasks.

AIt is allowed, but with no inspection

If traffic were allowed, even without inspection, it wouldn't be dropped, which contradicts the behavior typically seen in conserve mode for new inspection-required sessions.

BIt is allowed and inspected as long as the inspection is flow based

While flow-based inspection is generally less resource-intensive than proxy-based, FortiGate in conserve mode can still drop new sessions regardless of the inspection mode if the system resources are critically low. The primary action in conserve mode for new inspection sessions is to drop them.

CIt is dropped.Correct

The debug output would likely indicate that the FortiGate is in "conserve mode" due to high memory usage. When a FortiGate enters conserve mode, it prioritizes system stability by dropping new sessions that require resource-intensive processes like deep inspection (proxy-based inspection) to prevent memory exhaustion and potential crashes.

DIt is allowed and inspected, as long as the only inspection required is antivirus.

Antivirus inspection is a resource-intensive task. If only antivirus were required, traffic would still be dropped in conserve mode, as this is precisely the type of traffic FortiGate avoids processing to conserve resources.

Concept tested: FortiGate conserve mode behavior with new sessions requiring inspection

Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/339178/conserve-mode

Topics

#CLI debug#Traffic handling#Session inspection#Policy troubleshooting

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