NSE7_SDW Timed Practice Test 2 — 10 Questions

Question 1

You are troubleshooting a scenario where an SD-WAN template is not pushing to a FortiGate. Which log file on the FortiManager is most useful to identify the specific CLI command causing the failure?

Accepted Answer

fmg_debug.log. The fmg_debug.log or the task monitor logs show the specific CLI commands being pushed and the FortiGate response.

Answer

fmg_event.log

Answer

fmg_audit.log

Answer

fmg_system.log

Question 2

In an ADVPN 2.0 deployment, a hub unit uses BGP to advertise routes to spokes. When a spoke learns a prefix via BGP from the hub, what mechanism allows the spoke to automatically initiate an ADVPN shortcut tunnel directly to another spoke when traffic flows between them?

Accepted Answer

The FortiGate kernel detects traffic matching a dynamic BGP route over the IPsec interface and initiates an IKE shortcut negotiation with the target spoke. ADVPN shortcuts are triggered when traffic matches a shortcut trigger mechanism. In ADVPN 2.0, IPsec phase 1 shortcut settings ('set advpn shortcut') and dynamic routing protocols working together allow the kernel to generate shortcut requests when traffic hits the phase 1 interface.

Answer

OSPF sends a special multicast hello packet across the hub to establish mesh point-to-point links

Answer

FortiManager pushes a dynamic static route to both spokes simultaneously

Answer

The Web Filtering profile intercepts the packet and redirects it via proxy to the destination spoke

Question 3

When creating an SD-WAN template, what must be defined before you can add an SD-WAN interface to the template?

Accepted Answer

Individual SD-WAN member interfaces. You must define the member interfaces within the template before referencing them in SD-WAN zones or rules.

Answer

The SD-WAN health check probes

Answer

Global firewall policies

Answer

The virtual domain (VDOM) settings

Question 4

During SD-WAN template deployment, what is the role of 'Dynamic Mapping'?

Accepted Answer

To map a single template object to different physical settings on different devices. Dynamic mapping allows you to map a single template object to different physical values (like interface names) on different FortiGate devices.

Answer

To automate firmware updates

Answer

To monitor bandwidth usage

Answer

To dynamically change the SD-WAN rule based on time

Answer

To calculate the latency of paths

Question 5

Which TWO criteria can be used in SD-WAN rules to select an outgoing interface?

Accepted Answer

Source and destination address. Rules use criteria like source/destination address, services, and application signatures to steer traffic.

Answer

The name of the administrator

Answer

System temperature

Answer

Device serial number

Question 6

An administrator wants to apply a Web Filtering security profile to traffic that is being dynamically steered via an SD-WAN rule. Where must this security profile be enforced in FortiOS?

Accepted Answer

Inside the firewall policy that matches the traffic being steered by the SD-WAN rule. Security profiles in FortiOS are always applied within firewall policies, not directly inside SD-WAN rules or interface configurations. The SD-WAN rule handles routing/path selection, while the firewall policy handling that traffic enforces security profiles.

Answer

Directly inside the SD-WAN rule configuration under the advanced settings tab

Answer

Globally under the system settings as an SD-WAN overlay inspection profile

Answer

Within the IPsec tunnel phase 2 security association settings

Question 7

A FortiGate device is configured with an SD-WAN rule utilizing a SLA rule for latency and packet loss. Security profiles including Deep Packet Inspection (DPI) SSL inspection and an Antivirus profile are applied to the firewall policy allowing this traffic. Users report intermittent connection drops on real-time UDP-based applications. Upon troubleshooting, the administrator notices that packet drops occur only when the SD-WAN rule dynamically steers traffic to a backup IPsec tunnel that has a smaller MTU. What is the most likely root cause and mitigation for this behavior?

Accepted Answer

Path MTU Discovery is failing because ICMP unreachable messages are blocked, and TCP MSS clamping is not adjusting the encapsulated IPsec packet size correctly. IPsec encapsulation adds overhead, and if the Path MTU Discovery (PMTUD) fails due to ICMP fragmentation-needed messages being blocked by security profiles or firewalls along the path, packet drops occur for UDP streams exceeding the actual MTU. Adjusting the TCP MSS or enabling ipsec-phase1-interface fragmentation settings/tcp-mss-enforcement resolves this.

Answer

SD-WAN health check probes are overwhelming the IPsec tunnel bandwidth

Answer

The Antivirus proxy buffer is overflowing due to UDP streaming packets

Answer

The SSL inspection profile is attempting to decrypt UDP traffic, causing kernel panic and packet drops

Question 8

An administrator needs to inspect encrypted traffic traversing an SD-WAN IPsec tunnel using Deep Packet Inspection (DPI). What must be installed on the client endpoints or configured on the FortiGate to prevent browser trust warnings when using SSL/TLS full inspection?

Accepted Answer

The FortiGate's self-signed CA certificate must be installed in the trusted root certificate store of the client endpoints. When using SSL Full Inspection (DPI), the FortiGate acts as a man-in-the-middle and re-signs certificates using a Certificate Authority (CA) certificate. This CA certificate must be installed and trusted on the client devices.

Answer

ADVPN 2.0 shortcut certificates must be exchanged between spokes

Answer

BGP MD5 authentication keys must match on both routers

Answer

A pre-shared key must be configured in the IPsec Phase 1 proposal

Question 9

An administrator has configured BGP over multiple SD-WAN IPsec tunnels to provide redundant paths to a datacenter. However, asymmetric routing is causing stateful inspection drops on a secondary FortiGate firewall downstream. To ensure that BGP selects the preferred primary SD-WAN member consistently, which BGP attribute is best manipulated via a route-map applied to the BGP neighbor in FortiOS?

Accepted Answer

Local Preference. MED (Multi-Exit Discriminator) or Local Preference can influence inbound/outbound path selection. Local Preference is used to influence outbound routing decisions within an AS, while MED influences inbound traffic from external peers. For internal path selection across SD-WAN tunnels terminating on the same autonomous system or IBGP peers, Local Preference or weight (cisco-specific, but weight is local to FortiGate) / Route-map setting local-preference is standard.

Answer

AS-PATH prepend

Answer

Cluster ID

Answer

Origin code

Question 10

An IPsec VPN tunnel used as an SD-WAN member is experiencing intermittent flapping due to DPD (Dead Peer Detection) timeout issues over a high-latency satellite link. How should the administrator adjust the Phase 1 IPsec settings on FortiOS to stabilize the tunnel without completely disabling failure detection?

Accepted Answer

Increase the DPD retry count and interval settings under the IPsec Phase 1 configuration. On high-latency or high-jitter links like satellite connections, the default DPD retry count and interval may be too aggressive. Increasing the DPD retry count and/or interval or switching the DPD mode to 'on-idle' or 'on-demand' helps prevent false drops.

Answer

Disable DPD entirely so the FortiGate never tears down the tunnel

Answer

Enable NP6/NP7 hardware offloading for Phase 1 SA renegotiation

Answer

Change the IPsec phase 1 mode from Main mode to Aggressive mode