Fortinet Updated NSE5_SSE_AD-7.6 Exam Questions and Answers by sapphire

"If a flow is identified as belonging to a defined application category (such as social media), FortiGate will match it to the corresponding service rule (rule 2) and route it through the specified interface, such as port2. However, if the application is not recognized during the session setup, the system defaults to load balancing the traffic using the available tunnels according to the policy for unclassified traffic, ensuring continuous connectivity while waiting for application classification."

This guarantees both performance and resilience.

According to theSD-WAN 7.6 Core Administratorcurriculum and theFortiOS 7.6 Administration Guide, setting common web-based services like Facebook and LinkedIn as destinations in an SD-WAN rule is primarily accomplished through theInternet Service Database (ISDB).

Internet Service vs. Application Control: In FortiOS, there is a distinction betweenInternet Services(which use a database of known IP addresses and ports to identify traffic at the first packet) andApplications(which require the IPS engine to inspect deeper into the packet flow to identify Layer 7 signatures).

SD-WAN Efficiency: Fortinet recommends using theInternet service fieldfor services like Facebook and LinkedIn in SD-WAN rules because it allows the FortiGate to steer the traffic immediately upon the first packet. If the "Application" signatures were used instead, the first session might be misrouted because the application is not identified until after the initial handshake.

GUI Configuration: As shown in the exhibit (image_b3a4c2.png), the "Destination" section of an SD-WAN rule includes anInternet servicefield by default. To steer Facebook and LinkedIn traffic, the administrator simply clicks the "+" icon in that field and selects the entries for Facebook and LinkedIn from the database.

Feature Visibility (Alternative): While youcanenable a specific "Application" field inSystem > Feature Visibility(by enabling "Application Detection Based SD-WAN"), this is typically used for less common applications that do not have dedicated ISDB entries. For the specific "applications" mentioned (Facebook and LinkedIn), they are natively available in theInternet servicefield, making Option B the most direct and common implementation.

Why other options are incorrect:

Option A: Licensing for application signatures is part of the standard FortiGuard services and is not a prerequisite specific only to "applications as destinations" in SD-WAN rules.

Option C: Standalone FortiGate devices fully support application-based and ISDB-based steering in SD-WAN rules.

Option D: While enabling feature visibility would add anadditionalfield for L7 applications, it is not a "must" for Facebook and LinkedIn, which are already accessible via the Internet Service field provided in the default GUI layout.

According to theSD-WAN 7.6 Core Administratorstudy guide and theFortiOS 7.6 Administration Guide, when you are migrating a production FortiGate to use SD-WAN, the most critical step involves reconfiguring how traffic is permitted and routed.

Reference Removal Requirement: Before an interface (such as wan1 or wan2) can be added as anSD-WAN member, it must be "unreferenced" in most parts of the FortiGate configuration. Specifically, if an interface is currently being used in an activeFirewall Policy, the system will prevent you from adding it to the SD-WAN bundle.

Firewall Policy Migration (Option A): In a production environment, you mustreplace the references to the physical interfacesin your firewall policies with the newSD-WAN virtual interface(or an SD-WAN Zone). For example, if your previous policy allowed traffic from internal to wan1, you must update that policy so theOutgoing Interfaceis now SD-WAN. This allows the SD-WAN engine to take over the traffic and apply its steering rules.

Modern Tools: While this used to be a purely manual process, FortiOS 7.x includes anInterface Migration Wizard(found underNetwork > Interfaces). This tool automates the "search and replace" function, moving all existing policy and routing references from the physical port to the SD-WAN object to ensure minimal downtime.

Why other options are incorrect:

Option B: While you do need to update your routing (e.g., creating a static route for 0.0.0.0/0 pointing to the SD-WAN interface), the curriculum specifically emphasizes the replacement of references infirewall policiesas the primary administrative hurdle, as policies are often more numerous and complex than the single static route required for SD-WAN.

Option C: You donotneed to disable the interface. It must be up and configured, just removed from other configuration references so it can be "absorbed" into the SD-WAN bundle.

Option D: SD-WAN is abase featureof FortiOS and doesnot require a separate licenseor a reboot to enable.