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Fortinet NSE7_FSN_AR-7.6 Exam Prep
Fortinet NSE 7 - Secure Networking 7.6 Architect (Page 10 )

Updated On: 7-Oct-2026
Page 6 of 34
PDF with 164 Questions

An administrator wants to capture encrypted phase 2 traffic between two FotiGate devices using the built-in sniffer.
If the administrator knows that there Is no NAT device located between both FortiGate devices, which command should the administrator run?

  1. diagnose sniffer packet any 'udp port 500'
  2. diagnose sniffer packet any 'lp proto 50'
  3. diagnose sniffer packet any 'udp port 4500'
  4. diagnose sniffer packet any 'ah'

Answer(s): B

Explanation:

To captureencrypted IPsec phase 2 (ESP) trafficbetween two FortiGate devices, the correct protocol filter to use isip proto 50. According to the Fortinet official sniffing and debugging documentation, ESP (Encapsulating Security Payload) is used for encrypted phase 2 payload transfer and always uses IP protocol number 50. Running the commanddiagnose sniffer packet any 'ip proto 50'captures only ESP packets, which represent the encrypted traffic---whether originating or transiting the device.
If there is no NAT device between FortiGates, ESP is not encapsulated in UDP (thus not on UDP port 4500; if NAT-T were required, packets would be UDP-encapsulated, but the scenario explicitly says NAT is not in use). UDP port 500 is for IKE control (negotiation) traffic, and AH (Authentication Header, ip proto 51) is not used for encryption in standard IPsec phase 2 with ESP.
This matches the official CLI reference from Fortinet for VPN and traffic analysis.
**
FortiOS CLI Reference: diagnose sniffer packet, ESP, IP Protocol Numbers
FortiGate VPN Administration Guide: Traffic Capture and Analysis of IPsec Traffic



Refer to the exhibits.

An administrator Is expecting to receive advertised route 8.8.8.8/32 from FGT-A. On FGT-B, they confirm that the route is being advertised and received, however, the route is not being injected into the routing table.
What is the most likely cause of this issue?

  1. A batter route to the 8.8.8.8/32 network exists in the routing table.
  2. FGT-B is configured with a prefix list denying the 8.8.8.8/32 network to be injected into the routing table.
  3. The administrator has misconfigured redistribution of routes on FGT-A.
  4. FGT-B is configured with a distribution list denying the 8.8.8.8/32 network to be injected into the routing table.

Answer(s): B

Explanation:

The 8.8.8.8/32 route is visible in the OSPF database on FGT-B but not installed into the routing table---the most likely explanation is that FGT-B is filtering it from being installed.



Refer to the exhibit, which shows the output of a BGP debug command.

What can you conclude about the router in this scenario?

  1. The router 100.64.3.1 needs to update the local AS number in its BGP configuration in order to bring up the 8GP session with the local router.
  2. An inbound route-map on local router is blocking the prefixes from neighbor 100.64.3.1.
  3. All of the neighbors displayed are part of a single BGP configuration on the local router with the neighbor-range set to a value of 4.
  4. The BGP session with peer 10.127.0.75 is up.

Answer(s): D

Explanation:

The BGP debug output shows session information for peers, including state details. According to official Fortinet BGP documentation, if the session state with a peer does not show 'Idle,' 'Active,' or 'Connect,' but instead shows 'Established,' 'Up,' or related counters (e.g., messages sent/received or uptime), it indicates the session is operational. In this scenario, the peer 10.127.0.75 is the only one showing a positive indication of a live, established session. Other options like neighbor-range configuration, AS mismatch, or route-maps blocking prefixes are not supported by evidence provided in a simple BGP session state debug, nor does the output show errors relating to local or remote AS issues.
The correct interpretation comes from Fortinet's BGP troubleshooting guide, which outlines how to read session status and neighbor states in debug and summary outputs.
FortiOS BGP Debugging Guide: Session State Interpretation
BGP CLI Reference:
Neighbor Status Fields



MULTIPLE CHOICE
Which two statements about an auxiliary session ate true? (Choose two.)

  1. With the auxiliary session selling disabled, only auxiliary sessions are offloaded.
  2. With the auxiliary session setting enabled. ECMP traffic is accelerated to the NP6 processor.
  3. With the auxiliary session setting enabled. Iwo sessions are created in case of routing change.
  4. With the auxiliary session setting disabled, for each traffic path. FortiGate uses the same auxiliary session.

Answer(s): B,C

Explanation:

Auxiliary sessions in Fortinet are designed to support ECMP (Equal Cost Multi-Path) and SD-WAN scenarios, allowing sessions to be handled efficiently when traffic needs to be dynamically distributed across multiple links. With the auxiliary session setting enabled, FortiGate creates additional session table entries for each possible path in ECMP or SD-WAN---meaning that if the routing path changes (such as a link failover), a new session can be immediately activated and offloaded to the NP6 network processor for acceleration, ensuring minimal disruption. This greatly benefits high-throughput deployments.
Official documentation specifies that when auxiliary sessions are enabled, FortiGate doesn't just rely on dynamically creating new sessions after a routing event, it proactively creates sessions for all potential paths. This means that in the event of a route change, two sessions exist and the traffic is quickly re-routed and offloaded, maximizing performance and reliability. Without this feature, multiple paths cannot be efficiently offloaded, and routing changes trigger a single session update, reducing failover performance.
FortiOS Handbook: Session Table, ECMP, SD-WAN, and Auxiliary Sessions
FortiGate NP6 Acceleration Guide: Auxiliary Session Behavior



Exhibit.

Refer to the exhibit, which contains a screenshot of some phase 1 settings.
The VPN is not up. To diagnose the issue, the administrator enters the following CLI commands on an SSH session on FortiGate:

However, the IKE real-time debug does not show any output.
Why?

  1. The administrator must also run the command diagnose debug enable.
  2. The debug shows only error messages. If there is no output, then the phase 1 and phase 2 configurations match.
  3. The log-filter setting is incorrect. The VPN traffic does not match this filter.
  4. Replace diagnose debug application ike -1 with diagnose debug application ipsec -1.

Answer(s): A

Explanation:

To display debug output on FortiGate devices, you must always run both the application-specific debug command and the global debug enable command. The commanddiagnose debug application ike -1sets up the detail level for the IKE daemon debug, but it doesnot display any debug output on its own. As described in the FortiOS CLI debugging manuals, the commanddiagnose debug enableactivates debug output on the console, making all previously set debugs visible. This is especially important for VPN troubleshooting---without the enable command, no output appears even if there is VPN traffic.
The correct diagnostic sequence is:
diagnose debug application ike -1
diagnose debug enable
This procedure is found in every FortiOS CLI debug tutorial and troubleshooting workflow.
FortiOS CLI Reference:
Debugging VPNs and Real-time Debug Output
FortiGate VPN Troubleshooting Guide: Required Steps for Debug Output



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