Fortinet NSE7_FSN_AR-7.6 Practice Exam Questions & Answers

The exhibit with the diagnose vpn tunnel list output is not visible. The correct command to capture ESP (Encapsulating Security Payload) traffic for a specific VPN tunnel typically involves using a packet capture or debug command that targets the tunnel interface. For a VPN named DialUp_0, this would likely be a tcpdump or diagnose sniffer command specifying the tunnel name or interface.

To understand why Type 5 LSAs (AS External LSAs) are missing from the Link-State Database (LSDB), we must look at how OSPF generates and propagates them:

A . There is no autonomous system border router (ASBR) in the network:

Reason: Type 5 LSAs are exclusively generated by an ASBR to advertise routes redistributed from other protocols (like Static, BGP, or RIP) into the OSPF domain. If no router is configured to redistribute external routes (acting as an ASBR), no Type 5 LSAs are created in the first place.

C . The local router is located in a stub area:

Reason: By definition, a Stub Area (and a Totally Stubby Area) prevents Type 5 LSAs from entering. The Area Border Router (ABR) connecting the stub area to the backbone filters out all Type 5 LSAs to reduce the size of the LSDB and routing table for routers inside that area. Instead, a default route is usually injected.

Why other options are incorrect:

B: While database filtering exists, standard prefix-list filtering typically affects the routing table (RIB) generation, not the underlying LSDB propagation of Type 5 LSAs, or it is less common than the architectural reasons (Stub/No ASBR).

D: IP Protocol 89 is the transport for OSPF itself. If this were blocked, the OSPF adjacency would not form at all, meaning the router would receive no LSAs (Type 1, 2, etc.), not specifically just Type 5.

FortiGate Security 7.6 Study Guide (OSPF): 'Type 5 LSAs are generated by ASBRs... Stub areas do not allow Type 5 LSAs; they are replaced by a default route.'

The correct answers are A and D.

The Network Security Support Engineer 7.6 Study Guide explains that automation stitches consist of a trigger and one or more actions, and that they can detect events such as high CPU and conserve mode across the Security Fabric

The FortiOS administration guide then gives the exact practical example for A:

''Automation stitches can be created to run a CLI script and send an email message when memory or CPU usage exceeds specified thresholds.''

It also shows examples where the email body contains the script output using:

%%results%%

That directly confirms A.

For D, the FortiOS administration guide states:

''The URI and HTTP body can use parameters from logs or previous action results.''

It also explains the execution model:

''The stitch Action execution can be set to either Sequential or Parallel. In sequential execution actions will execute one after another with a delay (if specified). ... In parallel execution all actions will execute immediately when the stitch is triggered.''

A concrete example shows a second action using the output of the first action:

''This string for the body text includes the results from the preceding CLI script action.'' with

Body=%%results%%...

That confirms D.

Why the other options are wrong:

B is wrong because automation stitches can be triggered by IPS events, but the documentation does not describe them as modifying packet headers or payloads. Instead, they perform actions such as email, CLI script, webhook, quarantine, and similar automated responses

C is wrong because delay is associated with sequential execution, not parallel execution. The guide explicitly says: ''A delay can be added before an action if Sequential action execution is used.''

So the verified answers are: A, D.

Based on the Fortinet FCSS - Network Security 7.6 documents and the analysis of the VPN tunnel exhibit, here is the verified answer.

Questions no: 91

Verified Answer: A, C

Comprehensive and Detailed Explanation with all FCSS - Network Security 7.6 documents:

To determine the status of the VPN tunnel, we must examine the specific counters and fields in the diagnose vpn tunnel list output provided in the exhibit.

Analyze Phase 2 Status (Option A):

The output displays child_num=0.

In IKEv2 (and IKEv1 implementations in FortiOS), 'Child SAs' refer to the Phase 2 (IPsec) Security Associations that carry the actual data traffic.

A value of 0 indicates that no Phase 2 tunnels are established. If Phase 2 were up, child_num would be at least 1.

Additionally, under the proxyid section, the field sa=0 confirms there is no active Security Association for that traffic selector.

Analyze Traffic Status (Option C):

The stat line shows: rxp=0 txp=0 rxb=0 txb=0.

rxp (Received Packets) and txp (Transmitted Packets) are both zero. This definitively confirms that no traffic is traversing the tunnel currently. This is expected since Phase 2 is down.

Analyze Phase 1 Status (Why B is incorrect):

The tunnel entry exists in the list with a valid tun_id, and NAT-Traversal is active (natt: mode=keepalive).

The presence of the tunnel in this command output, along with active Keepalive mechanisms, typically indicates that Phase 1 (IKE SA) is established and the peers are communicating on port 4500 (NAT-T), even though the data tunnels (Phase 2) failed to negotiate. If Phase 1 were down, the tunnel would often not appear in this 'list' view or would show different status flags indicating a complete connection failure.

Conclusion: The exhibit shows a scenario where the Phase 1 control channel is likely up (evidenced by the entry existence and NATT keepalives), but the Phase 2 data channel is down (child_num=0), resulting in zero traffic flow (rxp=0/txp=0).

The debug output showing the FSSO failure is not provided. In DC Agent Mode, the collector agent authenticates users and the FortiGate queries the collector agent. If ping is successful but FSSO fails, the issue typically involves: incorrect collector agent port configuration, authentication failures (certificate or credentials), wrong IP address configured on FortiGate, firewall policy blocking the required port, or FSSO service not running on the collector agent.

The key point is that the two VPNs are dynamic dialup IPsec tunnels on the same interface and both are using IKEv1 main mode. In this design, FortiGate cannot reliably distinguish which dialup phase1 to match before phase 1 completes.

The uploaded Network Security Support Engineer 7.6 Study Guide shows that XAuth happens only after phase 1 is already established:

''The IKE real-time debug shows, after phase 1, the exchange of extended authentication (XAuth) packets... You can also see the CFG_REPLY, showing the XAuth user and group name.''

That means the user group is learned too late to be used for selecting the correct phase1 definition. So the fix must be applied to the phase1 matching method itself, not to XAuth.

The FortiOS administration guide gives the exact rule for this scenario:

''When the remote VPN peer has a dynamic IP address and is authenticated by a pre-shared key you must select Aggressive mode if there is more than one dialup phase 1 configuration for the interface IP address.''

The SD-WAN 7.6 Enterprise Administrator Study Guide states: ''An SD-branch is a site with an SD-WAN spoke FortiGate device and one or multiple extensions.'' It explains that FortiSwitch and FortiAP provide wired and wireless LAN connectivity through FortiLink, while FortiExtender supplements WAN connectivity by providing 4G/5G transport.

The guide further explains that the management plane sees extension-device ports as logical interfaces belonging to the controlling FortiGate. Therefore, FortiSwitch, FortiAP, and FortiExtender do not become independent SD-WAN topology nodes and do not require separate topologies. FortiGate devices with FortiLink connections also do not need to be excluded.

FortiExtender is specifically designed as a natural SD-WAN extension that introduces cellular connectivity as another WAN transport. Consequently, a FortiGate using FortiExtender can function as a hub, provided it satisfies the required capacity, routing, and IPsec design requirements. There is no rule requiring hubs to be extension-free. Therefore, option D correctly describes the unified topology shown in the exhibit.