Free Practice Questions for Fortinet NSE5_FSW_AD-7.6 Exam

According to theFortiSwitchOS 7.6 Administration Guideand theFortiSwitch 7.6 Study Guide, Multichassis Link Aggregation (MCLAG) and standard Link Aggregation Groups (LAG) are designed to provide link-level and node-level redundancy while presenting a simplified logical view to the Spanning Tree Protocol (STP).

In the provided topology:

Logical Switch View (Option D):Switch 1 and Switch 2 are configured asMCLAG peersconnected via an Inter-Chassis Link (ICL). From the perspective of downstream devices and STP, these two physical switches act as a single logical entity. This prevents STP from seeing a loop between the two switches and the downstream Switch 3, as the redundant physical paths are bundled into a single logical MCLAG trunk.

Logical Interface View (Option B):The exhibit shows Switch 4 connected to Switch 3 via two physical links bundled into aLAG, and Switch 3 connected to the MCLAG peers via split links. In both cases, STP treats the aggregated physical links as asingle logical interface. Because the multiple physical paths are managed by the Link Aggregation Control Protocol (LACP) as one trunk, STP does not block individual ports to prevent loops; instead, it sees one high-bandwidth path.

Regarding the incorrect options:Option Ais false because Switch 3 is an MCLAGclient, not a peer in the group.Option Cis incorrect because Switch 3 and Switch 4 are separate physical and logical nodes; they are not seen as a single client entity by the core.

The information in the " Native VLAN " column for port23 on the FortiSwitch indicates that a standalone switch is connected to it. This is because the column displays " $424MPTF20000027, " which matches the format of a Fortinet device serial number.

Here ' s a breakdown of the evidence in the image:

Native VLAN:The " Native VLAN " column typically displays the VLAN ID for untagged traffic on a trunk port. However, in this case, it shows a serial number format ( " $424MPTF20000027 " ).

No Trunk Information:The " Trunk " column is blank for port23, indicating it ' s not configured as a trunk member.

Other Ports:Port1 and port2 show " default " in the " Native VLAN " column, which is the expected behavior for access ports.

Fortinet FortiSwitch devices typically don ' t display the serial number of adjacent FortiSwitch devices in the " Native VLAN " column. This column is reserved for VLAN information on trunk ports.

According to theFortiSwitchOS 7.6 Administration Guide (Page 320), management traffic on a FortiSwitch is associated with a specific logical interface, which in this case is the " internal " interface. The exhibit shows that the " internal " interface is configured onVLAN 4094(both as native and allowed). This means that for any management traffic (such as HTTPS, SSH, or SNMP) to reach the switch CPU, it must be able to traverse the physical uplink on VLAN 4094.

However, the configuration forport24(the uplink) is currently restricted. It is set withnative VLAN 100and an allowed-vlans list that only includes100 and 200. Because VLAN 4094 is not included in the allowed list of port24, all frames belonging to the management VLAN (4094) are dropped by the switch ' s ingress/egress filters on the uplink.

To resolve this and restore management access, the administrator has two valid configuration paths based on the provided options:

Option B:Change thenative VLAN on port24 to VLAN 4094. By making 4094 the native VLAN, untagged management traffic can traverse the port, effectively allowing the " internal " interface to communicate with the network.

Option D:Add VLAN 4094 to the allowed VLANs on port24. This ensures that VLAN 4094 is no longer filtered out, allowing management frames to pass through the uplink while maintaining the current native VLAN for other traffic.

Option C is irrelevant as removing a working VLAN (200) does not help the management traffic. While Option A describes an alternate architectural approach (moving management into an already-allowed VLAN), Options B and D represent the direct fixes for the mismatch described in the 7.6 administration documentation.

In a FortiLink-managed switching architecture, the FortiGate firewall acts as the centralized controller for downstream FortiSwitch devices. TheFortiSwitch Faceplatesview in the FortiGate GUI provides a physical-style representation of switch ports, including port numbers, operational status, link state, speed, duplex, and connected neighbor information. According to FortiOS 7.6 and FortiSwitchOS 7.6 documentation fromFortinet, this port-level intelligence is derived fromLink Layer Discovery Protocol (LLDP)advertisements received from the FortiSwitch.

LLDP is an IEEE 802.1AB standard protocol used for vendor-neutral Layer 2 neighbor discovery. FortiSwitch periodically sends LLDP frames that include detailed port descriptors such as chassis ID, port ID, port description, system name, system capabilities, and VLAN-related attributes. When FortiGate receives these LLDP advertisements over the FortiLink interface, it correlates the information with the managed FortiSwitch inventory and renders accurate port details in the Faceplates view.

Other options are incorrect for the following reasons. The FortiSwitch model alone is insufficient to populate per-port operational details. Cisco Discovery Protocol (CDP) is a Cisco-proprietary protocol and is not used by FortiGate for Faceplates visualization. FortiLink discovery frames are used to establish and maintain the FortiLink management relationship, but they do not carry the granular per-port metadata required for the Faceplates display.

Therefore, the Faceplates view relies specifically onLLDP advertisements received from the FortiSwitch, making optionCthe correct and fully verified answer based on FortiOS 7.6 and FortiSwitchOS 7.6 behavior.