Fortinet NSE4_FGT_AD-7.6 Exam Actual Questions
Fortinet NSE 4 - FortiOS 7.6 Administrator (Page 3 )

Updated On: 22-Jul-2026

Refer to the exhibit.

An SD-WAN zone configuration on the FortiGate GUI is shown. Based on the exhibit, which statement is true?

  1. The Underlay zone contains no member.
  2. The virtual-wan-link and overlay zones can be deleted
  3. The Underlay zone is the zone by default.
  4. port2 and port3 are not assigned to a zone.

Answer(s): A

Explanation:

According to the FortiOS 7.6 Administrator Guide and the specific behavior of the SD-WAN GUI, here is the technical breakdown:
SD-WAN Zone Hierarchy and UI Elements: In the FortiGate GUI, SD-WAN zones that contain member interfaces are displayed with a plus (+) icon next to the checkbox. This icon allows administrators to expand the zone and view the specific physical or logical interfaces assigned to it.
Analysis of the "Underlay" Zone: In the provided exhibit, the virtual-wan-link and overlay zones both feature the plus (+) expansion icon, indicating they have active members. The Underlay zone, however, lacks this icon and displays a red status icon. This is the visual indicator in FortiOS that the zone is currently empty and contains no member interfaces.
Mandatory Zone Membership: In FortiOS 7.x, every SD-WAN member interface must be assigned to a zone. It is not possible for an interface to be an "SD-WAN member" (as shown in the legend with port2 and port3) without being assigned to a zone. Since port2 and port3 are listed in the legend, they are indeed assigned to one of the other expanded zones (likely virtual-wan-link or overlay), making Option D incorrect.
Default Zone Behavior: While FortiOS 7.6 often creates default zones like virtual-wan-link, underlay, and overlay during certain configuration wizards or by default in newer versions, they are distinct entities. There is no single "default" zone that acts as a global catch-all in the way Option C suggests.
Immutability of System Zones: While certain system-defined zones have restrictions, the primary focus of this specific exhibit is the current membership state, which clearly shows the Underlay zone is empty.



An administrator wants to configure dead peer detection (DPD) on IPsec VPN for detecting dead tunnels. The requirement is that FortiGate sends DPD probes only when there is no inbound traffic.
Which DPD mode on FortiGate meets this requirement?

  1. On Demand
  2. Enabled
  3. On Idle
  4. Usabled

Answer(s): A

Explanation:

Based on the FortiOS 7.6 Infrastructure and IPsec VPN documentation, Dead Peer Detection (DPD) can be configured in three primary modes: On Demand, On Idle, and Disabled.
On Demand (Default Mode): This mode is specifically designed to minimize unnecessary traffic. In this mode, FortiGate sends DPD probes only when there is no inbound traffic but the FortiGate is attempting to send outbound traffic. Because network communication is typically bidirectional, the absence of inbound traffic while outbound traffic is being sent is a primary indicator of a potentially dead tunnel. This matches the specific requirement described in the question.
On Idle: In this mode, DPD probes are sent if no traffic (neither inbound nor outbound) has been observed in the tunnel for a specific period. It verifies the tunnel status even when the connection is completely idle.
Enabled: In older versions or specific CLI contexts, "Enabled" may refer to periodic DPD, but in the current FortiOS 7.x/7.6 GUI and CLI terminology for Phase 1 settings, the active modes are defined as on-demand or on-idle.
Disabled: In this mode, the FortiGate does not send DPD probes but will still respond to DPD probes sent by the remote peer.
The requirement that the administrator wants probes sent only when there is no inbound traffic (usually implying the FortiGate is sending but not receiving) is the fundamental definition of the On Demand mechanism in the Fortinet curriculum.



Refer to the exhibit.

Which two statements about the FortiGuard connection are true? (Choose two.)

  1. The weight increases as the number of failed packets rises
  2. You can configure unreliable protocols to communicate with FortiGuard Server.
  3. FortiGate identified the FortiGuard Server using DNS lookup.
  4. FortiGate is using the default port for FortiGuard communication.

Answer(s): A,D

Explanation:

Based on the diagnose debug rating output provided in the exhibit and the standard behavior of the FortiGuard connection mechanism in FortiOS 7.6:
Weight Calculation (Statement A is True):
In FortiOS, the rating server selection process uses a weight-based system.
According to official documentation, the weight increases with failed packets (lost responses) and decreases with successful packets.
This mechanism ensures that servers with poor reliability are penalized by having higher weights, effectively pushing them to the bottom of the preference list.
Default Port Communication (Statement D is True):
The exhibit explicitly shows the communication is using HTTPS on port 8888.
In FortiOS 7.6 (and legacy versions like 6.2/6.4), FortiGuard filtering supports specific protocols and ports: HTTPS on ports 443, 53, and 8888, where 8888 is considered a default port for FortiGuard queries.
Ports 53 and 8888 are standard for both UDP and TCP/HTTPS FortiGuard communications to avoid common firewall blocks on standard web ports.
Why other options are incorrect:
Statement B (Unreliable protocols): While you can configure UDP (which is unreliable), the exhibit specifically shows HTTPS is being used, which is a reliable (TCP-based) protocol.
Statement C (DNS lookup): In the "Flags" column of the server list, a server found via DNS lookup would be marked with the "D" flag. The exhibit shows the flag as "I" (indicating the last INIT request was sent to this server) and a numeric "2," but the "D" flag is absent. Additionally, the IP 10.0.1.241 is a private address, suggesting it is a manually configured FortiManager or local override server rather than a public server found via global DNS lookup.



What are two features of FortiGate FSSO agentless polling mode? (Choose two.)

  1. FortiGate uses the AD server as the collector agent.
  2. FortiGate uses the SMB protocol to read the event viewer logs from the DCs.
  3. FortiGate does not support workstation check.
  4. FortiGate directs the collector agent to use a remote LDAP server.

Answer(s): B,C

Explanation:

Based on the FortiOS 7.6 Administrator Guide regarding Fortinet Single Sign-On (FSSO) polling modes, the agentless polling mode has specific technical characteristics:
SMB Protocol Usage (Statement B is True):
In agentless polling mode, the FortiGate unit itself acts as the collector.
It establishes direct connections to the Windows Domain Controllers (DCs) using the SMB (Server
Message Block) protocol, typically over TCP port 445, to read the Windows Security Event logs.
This allows FortiGate to parse login event IDs (such as 4768 and 4769) to identify users and their corresponding IP addresses without needing an external collector agent installed on a server.
Workstation Check Support (Statement C is True):
One of the primary limitations of the agentless polling mode compared to the agent-based mode is the lack of workstation verification.
In agentless mode, FortiGate does not perform "workstation checks" or "dead entry checks". This means it cannot proactively verify if a user is still logged into a specific workstation after the initial logon event is recorded, which can lead to stale entries if a user logs off without a corresponding event being captured.
Why other options are incorrect:
Option A: In agentless mode, FortiGate (the FSSO daemon) performs the collection itself; it does not use the AD server as a "collector agent" in the functional sense of FSSO architecture.
Option D: While FortiGate uses LDAP to retrieve group membership information once a user is identified, it does not "direct" a collector agent to a remote LDAP server, as there is no external collector agent involved in this specific mode.



An administrator wants to form an HA cluster using the FGCP protocol.
Which two requirements must the administrator ensure both members fulfill? (Choose two answers)

  1. They must have the same HA group ID.
  2. They must have the heartbeat interfaces in the same subnet.
  3. They must have the same number of configured VDOMs.
  4. They must have the same hard drive configuration.

Answer(s): A,D

Explanation:

“To successfully form an HA cluster, you must ensure that the members have the same:
• Model: hardware model or VM model
• Firmware version
• Licensing: includes the FortiGuard license, virtual domain (VDOM) license, FortiClient license, and so on
• Hard drive configuration: the same number and size of drives and partitions
• Operating mode: the operating mode—NAT mode or transparent mode—of the management VDOM.”
“From a configuration and setup point of view, you must ensure that the HA settings on each member have the same group ID, group name, password, and heartbeat interface settings. Try to place all heartbeat interfaces in the same broadcast domain, or for two-member clusters, connect them directly.”
Technical Deep Dive: The correct answers are A and D.
A is correct because FGCP cluster formation requires matching HA parameters, and group ID is explicitly one of them. If the group ID differs, the units will not consider each other part of the same cluster during HA discovery and election.
D is correct because FortiGate HA expects hardware parity in critical platform characteristics, including hard drive configuration. If disk layout differs, the members do not satisfy the HA formation prerequisites.
B is incorrect because the study guide does not require heartbeat interfaces to be in the same IP subnet. The requirement is that heartbeat links be in the same broadcast domain, or directly connected in a two-node design. In practice, heartbeat links are Layer 2 adjacency links; IP subnet matching is not the stated requirement.
C is incorrect because the guide does not say both units must start with the same number of configured VDOMs.
What must match is the licensing level and the operating mode of the management VDOM. After cluster formation, the primary synchronizes its configuration to the secondary.
A practical verification set before forming FGCP HA is:
get system status show system ha diagnose sys ha status
Operationally, FGCP then uses the heartbeat links for member discovery, health monitoring, election, and config/session synchronization. On supported hardware, session forwarding and HA processing can still benefit from FortiGate’s ASIC-assisted architecture, but HA state, config sync, and election logic remain control-plane functions handled by FortiOS.



Refer to the exhibit.

A network administrator is troubleshooting an IPsec tunnel between two FortiGate devices. The administrator has determined that phase 1 status is up, but phase 2 fails to come up.
Based on the phase 2 configuration shown in the exhibit, which two configuration changes will bring phase 2 up? (Choose two.)

  1. On BR1-FGT, set Remote Address to 10.0.11.0/255.255.255.0.
  2. On HQ-NGFW. enable Diffie-Hellman Group 2.
  3. On BR1-FGT. set Seconds to 43200
  4. On HQ-NGFW. set Encryption to AES256.

Answer(s): A,D

Explanation:

Phase 1 being up confirms the two FortiGate devices can authenticate and build the IKE SA. Phase 2 failing indicates the IPsec (Quick Mode) SA negotiation is failing due to mismatched Phase 2 parameters.
From the exhibit, the Phase 2 mismatches that would prevent SA establishment are:
1) Phase 2 selectors must mirror each other (Proxy IDs)
HQ-NGFW Phase 2 selector shows:
Local: 10.0.11.0/24
Remote: 172.20.1.0/24
BR1-FGT Phase 2 selector shows:
Local: 172.20.1.0/24 ⟵ Remote: 10.11.0.0/24
does not match HQ’s local subnet (10.0.11.0/24)
In FortiOS, Phase 2 comes up only when the peers’ selectors (proxy IDs) match as opposite pairs (local on one side = remote on the other).
✅ Fix: A. On BR1-FGT, set Remote Address to 10.0.11.0/255.255.255.0.
2) Phase 2 proposal must match (encryption/authentication)
HQ-NGFW shows encryption AES128 (with SHA1)
BR1-FGT shows encryption AES256 (with SHA1)
For Phase 2 to establish, both peers must have at least one common proposal (same encryption and authentication settings). With one side set to AES128 and the other to AES256, there is no match.
✅ Fix:
D: On HQ-NGFW, set Encryption to AES256.
Why the other options are not correct
B: Enable Diffie-Hellman Group 2: The exhibit’s mismatch is not resolved by adding DH group 2, and DH group must match when PFS is enabled. This option does not align the peers based on what’s shown.
C: Set Seconds to 43200: Phase 2 lifetime mismatches typically do not prevent Phase 2 from coming up (the negotiated lifetime can be adjusted by the peers). The hard blockers here are the selectors and proposal mismatch.



Refer to the exhibit.

What would be the impact of these settings on the Server certificate SNI check configuration on FortiGate?

  1. FortiGate will accept and use the CN in the server certificate for URL filtering if the SNI does not match the CN or SAN fields.
  2. FortiGate will accept the connection with a warning if the SNI does not match the CN or SAN fields.
  3. FortiGate will close the connection if the SNI does not match the CN or SAN fields.
  4. FortiGate will close the connection if the SNI does not match the CN and SAN fields

Answer(s): C

Explanation:

Based on the exhibit and the FortiOS 7.6 SSL/SSH Inspection documentation, the correct answer is C.
Understanding the Exhibit Configuration
In the SSL/SSH Inspection Profile, the following settings are shown:
Inspection method: Full SSL Inspection
Server certificate SNI check: Strict
This setting directly controls how FortiGate validates the Server Name Indication (SNI) provided by the client during the TLS handshake.
FortiOS 7.6 Behavior of “Server certificate SNI check”
FortiOS supports three modes for Server certificate SNI check:
Disable
No validation between SNI and server certificate.
Enable
FortiGate checks SNI against the certificate.
If mismatch occurs, FortiGate may still allow the session with reduced validation.
Strict
FortiGate enforces a strict match.
The SNI must match either the CN (Common Name) or one of the SAN (Subject Alternative Name) entries in the server certificate.
If the SNI does not match either CN or SAN, the TLS session is immediately terminated.
The exhibit clearly shows Strict selected.
Why Option C is Correct
With Strict enabled, FortiGate rejects the TLS connection when:
The SNI does not match the CN, and
The SNI does not match any SAN entry
This results in the connection being closed, not allowed with warnings or fallback behavior.
Therefore:
C . FortiGate will close the connection if the SNI does not match the CN or SAN fields is exactly the documented behavior.
Why the Other Options Are Incorrect
A: FortiGate does not fall back to using the CN for URL filtering when Strict is enabled.
B: There is no “accept with warning” behavior in Strict mode.
D: Incorrect logical condition. FortiGate does not require mismatch with both CN and SAN simultaneously; a mismatch with either valid field set is sufficient to close the connection.



Refer to the exhibits.


You have implemented the application sensor and the corresponding firewall policy as shown in the exhibits.
You cannot access any of the Google applications, but you are able to access www.fortinet.com.
Which two actions would you take to resolve the issue? (Choose two.)

  1. Set SSL inspection to deep-content inspection.
  2. Move up Google in the Application and Filter Overrides section to set its priority lot
  3. Add "Google".com to the URL category in the security profile.
  4. Change the Inspection mode to Flow-based
  5. Set the action for Google in the Application and Filter Overrides section to Allow

Answer(s): B,E

Explanation:

From the exhibits:
The firewall policy has Application Control enabled and uses certificate-inspection for SSL inspection.
The application sensor has Application and Filter Overrides with the following order (priority):
Excessive-Bandwidth with action Block
Google (vendor filter) with action Monitor
In FortiOS, Application and Filter Overrides are evaluated by priority (top-down). The first matching override is applied. If traffic matches an earlier override with Block, it will be blocked even if a later override would Monitor/Allow it.
Why Google apps fail while www.fortinet.com works:
Many Google applications can be detected as (or can trigger) the Excessive-Bandwidth behavior/signature depending on the specific service and traffic pattern.
Because Excessive-Bandwidth (Block) is above Google (Monitor), Google-related traffic may match the first rule and be blocked before the Google override is evaluated.
Access to www.fortinet.com works because that traffic is not matching the Excessive-Bandwidth override.
Therefore, to resolve:
B . Move up Google in the Application and Filter Overrides section to set its priority higher
This ensures Google matches the Google override before any broader blocking override is applied.
E . Set the action for Google in the Application and Filter Overrides section to Allow
This explicitly permits Google applications once the higher-priority match occurs (stronger than Monitor for troubleshooting and ensuring access).
Why the other options are not the best fit here:
A (deep-content inspection) can help identify more HTTPS applications, but the exhibit already shows a specific Google override configured; the immediate issue is the override evaluation order and action.
C relates to Web Filter URL categories, but the problem is occurring under Application Control behavior/vendor overrides.
D (flow-based) is not required to fix an override priority/action conflict.



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