NSE4_FGT_AD-7.6 Exam Dumps : Fortinet NSE 4 - FortiOS 7.6 Administrator

According to the FortiOS 7.6 High Availability (HA) Administration Guide and FGCP (FortiGate Clustering Protocol) requirements, the correct answers are B and D.

FGCP HA Cluster Mandatory Requirements (FortiOS 7.6)

When forming an HA cluster using FGCP, FortiGate devices must meet several strict compatibility and configuration requirements. Among the options given, the following two are mandatory:

✅ B. They must have the same number of configured VDOMs

In FortiOS HA, all cluster members must have the same VDOM configuration.

This includes:

Same number of VDOMs

Same VDOM names

This is required so configuration synchronization can occur correctly between members.

If VDOM counts differ, HA formation will fail.

✔ This is explicitly required and documented.

✅ D. They must have the same HA group ID

The HA group ID uniquely identifies an HA cluster on the network.

All FortiGate units intended to join the same cluster must share the same HA group ID.

If the group IDs differ, devices will not recognize each other as cluster peers.

✔ This is a fundamental FGCP requirement.

Why the Other Options Are Incorrect

❌ A. They must have the same hard drive configuration

Hard drive presence or size does not have to match for FGCP HA to function.

Disk differences may affect logging behavior, but they do not prevent HA cluster formation.

Therefore, this is not a required condition.

❌ C. They must have the heartbeat interfaces in the same subnet

Heartbeat interfaces must be:

Directly connected

In the same Layer 2 broadcast domain

They do not require IP addressing or being in the same IP subnet.

In many deployments, heartbeat interfaces have no IP addresses at all.

Therefore, “same subnet” is not a documented requirement.

Comprehensive and Detailed 150 to 200 words of Explanation From Exact Extract of FortiOS 7.6 documents:

According to FortiOS 7.6 High Availability documentation, the FortiGate Cluster Protocol (FGCP) provides robust mechanisms for both link monitoring and stateful data synchronization. Link failover is a primary trigger for cluster renegotiation; if a monitored interface goes down—including when an administrator manually sets the interface to administratively down—the primary unit's priority is effectively reduced, triggering a failover to a secondary unit to ensure path continuity.5 This is a standard method for testing HA failover behavior.

Furthermore, to achieve a seamless stateful failover where active sessions are not dropped, the FortiGate performs incremental synchronization of critical runtime data.6 This specifically includes Forwarding Information Base (FIB) entries, which represent the compiled routing table, and IPsec Security Associations (SAs).7 By synchronizing IPsec SAs, the secondary unit 8can resume encrypted tunnels immediately after a failover without requiring a f9ull IKE re-negotiation.10 Statement A is incorrect because in-band and out-of-band management can coexist using reserved management interfaces and management-ip settings.11 Statement C is incorrect because while heartbeat interfaces use link-local IPs in the 169.254.0.x range, the specific IP .2 is not universally required for all heartbeats and depends on the number of cluster members and serial numbers.

Based on the FortiOS 7.6 Authentication and User Group documentation, the correct answer is A.

Meaning of “Include in every user group” (FortiOS 7.6)

When configuring a RADIUS server on FortiGate, enabling Include in every user group has a very specific and documented effect:

The configured RADIUS server object is automatically added to all FortiGate user groups.

As a result, any user who successfully authenticates against that RADIUS server becomes a valid member of every FortiGate user group, unless additional group filtering (such as RADIUS attributes) is applied.

This simplifies configuration when the same external authentication source must be accepted across multiple firewall policies that reference different user groups.

This behavior is explicitly described in the FortiOS 7.6 Administrator Guide under RADIUS authentication servers and user groups.

Why Option A is Correct

FortiGate user groups can include:

Local users

LDAP servers

RADIUS servers

Enabling Include in every user group causes FortiGate to:

Insert the RADIUS server into all existing and future FortiGate user groups

Therefore, all users authenticating via this RADIUS server are implicitly allowed in every FortiGate user group.

This is exactly what option A describes.

Why the Other Options Are Incorrect

B: FortiGate does not push users or groups into the RADIUS server. Authentication is always initiated by FortiGate toward RADIUS.

C: FortiGate does not manage or modify RADIUS-side group definitions.

D: LDAP and RADIUS user groups are separate authentication mechanisms; this setting does not merge or affect LDAP groups.