Fortinet FCSS_NST_SE-7.6 Exam Dumps

The study guide states:

''The kernel memory slabs are collections of objects with a common purpose. The kernel uses them to store information in memory.''

It also gives the exact calculation rule:

''Total slab size = available objects x object size''

From the exhibit:

tcp_session 3 5 1500 ...

So:

available objects = 5

object size = 1500

Therefore:

Total slab size = 5 1500 = 7500 kB

That makes D correct, and it is associated with the kernel, not user space.

Why the other options are wrong:

A is wrong because sctp_session 0 0 1600 ... gives 0 1600 = 0, but slabs are associated with the kernel, not user space.

B is wrong because ip_session 1 3 1200 ... gives 3 1200 = 3600, but again slabs are kernel memory, not user space.

C is wrong because ip6_session 0 0 1300 ... gives 0 1300 = 0, not 1300.

The correct answers are B and C.

The study guide has a section titled ''Not Verified Status on the Collector Agent'' and states:

''The collector agent cannot verify if the user is still logged in'' and lists these common causes:

''A firewall is blocking traffic to port 139 and 445''

''The workstation remote registry service is not running''

The guide also explains the verification method:

''For WMI polling mode, the collector agent checks the WMI service. For all the other modes, the collector agent checks the HKEY_USERS hive through remote registry services.'' If the workstation does not respond to these checks, the status can become not verified

An additional requirements slide in the same study guide confirms:

''TCP ports 139 and 445 must be open between the collector agent and all workstations''

''Remote registry service must be up and running on each workstation''

Why the other options are wrong:

A is wrong because the study guide mentions a workstation coming out of hibernate mode under a different problem: ''No Internet After IP Address Change'', not as a common cause of Not Verified status

D is wrong because DNS resolution issues are also discussed under the IP address change scenario, where the collector agent uses DNS to resolve the workstation name after an IP change. That is separate from the Not Verified causes listed for this log message

So the verified answers are: B, C.

Comprehensive and Detailed Explanation From Exact Extract of Network Security Support Engineer Study Guide (FortiOS 7.6) topics:

The correct answers are A and B. Security Fabric communication uses Fortinet-proprietary protocols, mainly FortiTelemetry and Neighbor Discovery. The study guide states that FortiTelemetry uses TCP port 8013, and that the connection is always established by the downstream FortiGate toward the upstream FortiGate. This validates option A. The same section also states that FortiTelemetry must be manually enabled. More precisely, the upstream FortiGate interface must have Security Fabric Connection enabled under administrative access so it can accept incoming Security Fabric connection requests. This validates option B.

Analyze the 'Send to Application Layer' Message:

The most critical line in the debug output is: id=65308 ... func=av_receive ... msg='send to application layer'

Meaning: This message indicates that the FortiGate kernel is handing the packet over to a user-space daemon (specifically the WAD/Proxy process, indicated by av_receive handlers) for deep inspection.

Implication: This behavior is the hallmark of Proxy-based inspection. In Flow-based inspection, the traffic is handled by the IPS engine (often within the kernel or via specific IPS handlers like ips_measure), and you would not typically see a 'send to application layer' message for standard web filtering.

Evaluate Option B (Firewall Policy Mode):

Since the traffic is being sent to the application layer proxy, the Firewall Policy controlling this traffic (Policy ID 1, as seen in Allowed by Policy-1) must be configured with Inspection Mode = Proxy. If it were Flow-based, the traffic would stay in the flow path. Thus, Option B is correct.

Evaluate Option C (Web Filter Profile Mode):

In FortiOS, when a firewall policy is set to Proxy-based inspection, the security profiles (like Web Filter) applied to that policy also operate in Proxy-based inspection mode. The presence of the av_receive function confirms that the content inspection (Web Filter/AV) is being performed by the proxy engine. Thus, Option C is correct.

Why Option A is Incorrect (NPU Offload):

The output shows npu_state=0x100. In the context of a flow trace where traffic is being 'sent to application layer,' this confirms the session is not fully offloaded to the NPU (Network Processor). Offloaded traffic (Fast Path) is handled by the hardware and would not generate these specific CPU-level debug logs for the payload inspection phase. The proxying process requires CPU intervention.

Why Option D is Incorrect (Port Mapping):

While valid protocol mapping is necessary for inspection, the specific debug output shown is a direct result of the Inspection Mode (Proxy vs. Flow). The observation of the traffic moving to the application layer is primarily caused by the policy and profile mode settings, making B and C the direct 'observations' derived from the log data.

FortiGate Troubleshooting (Debug Flow): 'If the debug flow shows msg='send to application layer', it confirms the traffic is being handled by the proxy (WAD) for Proxy-based inspection.'

The exhibit displays the output from the diagnose debug rating command on a FortiGate device. This command is used to display information about FortiGuard Web Filtering or other security-related queries performed by FortiGate to FortiGuard servers. Official Fortinet documentation outlines the meaning of each field in the server list. The FortiGate maintains a list of available FortiGuard servers, selecting the optimal server based on factors such as weight, round-trip time (RTT), and regional settings.

The very first entry in the server list after 'Server List' is the server FortiGate initially uses, prioritized by factors such as proximity and RTT. Here, 64.26.151.37 is listed first, and the FortiGuard-requests value confirms that this server handled the highest number of requests.

The IPs, weights, and lost/failed counters are monitored for server performance and selection over time. FortiGate's default operational logic is to try the first entry for contract validation and use the next in the list if the first is unavailable or has high latency or packet loss.

There is no direct correlation between the Weight and the number of FortiGuard-requests. The servers with higher or lower weights may still handle different request volumes based on availability and performance.

The TZ (time zone) value's sign (positive or negative) does not affect server preference; it is informational, showing the server's location relative to UTC, not a rating metric.

DNS query results for FortiGuard servers are not shown here, and the provided servers are not returned in DNS query order.

This command and interpretation are detailed in the FortiOS Administration Guide's section describing FortiGuard server selection and contract validation processes.

References:

FortiOS Administration Guide: FortiGuard Service Connectivity and Debugging

Official Technical Notes on diagnose debug rating output structure