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| Section | Objectives |
|---|---|
| Topic 1: Enterprise Firewall | - High availability - VPN technologies - Security Fabric integration - Centralized management and analytics - Troubleshooting - Routing and advanced networking - Advanced firewall deployment - Authentication and identity |
| Topic 2: SD-WAN | - SD-WAN routing - Deployment and troubleshooting - Overlay VPN - Application steering - SD-WAN architecture - Performance SLA |
>> NSE7_FSN_AR-7.6 Exam Guide Materials <<
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NEW QUESTION # 64
Refer to the exhibit.
If the default settings are m place, what can you conclude about the conserve mode shown in the exhibit?
Answer: C
Explanation:
The exhibit shows:
memory conserve mode: on
memory used: 2706 MB 89% of total RAM
memory used threshold red: 2675 MB 88% of total RAM
memory used + freeable threshold extreme: 2887 MB 95% of total RAM
The study guide states that the default thresholds are:
Extreme = 95%
Red = 88%
Green = 82%
So this FortiGate is in conserve mode because memory usage is 89%, which is above the red threshold (88%), but it has not yet reached the extreme threshold (95%).
The study guide then explains exactly what happens during conserve mode:
"For traffic that requires proxy-based inspection (and if memory usage has not exceeded the extreme threshold):
config system global
set av-failopen [off | pass | one-shot]
pass (default): All new sessions pass without inspection"
It also says:
"The av-failopen setting also applies to flow-based antivirus inspection." And the same page adds:
"If memory usage exceeds the extreme threshold, all new sessions that require inspection (flow-based or proxy-based) are blocked." Therefore, with default settings and with memory usage below the extreme threshold, FortiGate is allowing new sessions that require inspection, but bypassing inspection. That matches C.
Why the other options are wrong:
A is wrong because the default behavior is not to block proxy-based inspected sessions; the default is pass, meaning they pass without inspection B is wrong because if memory rises another 6%, it reaches 95%, which is the extreme threshold. At that point, the study guide says all new sessions that require inspection are blocked D is wrong because FortiGate blocks all new inspected sessions only when memory usage exceeds the extreme threshold, and the exhibit shows it is currently at 89%, not 95%
NEW QUESTION # 65
Exhibit.
Refer to the exhibit, which shows two entries that were generated in the FSSO collector agent logs.
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee What three conclusions can you draw from these log entries? {Choose three.)
Answer: B,D,E
NEW QUESTION # 66
Refer to the exhibit.
Which two observations can you make about the web filter traffic captured using the flow tool? (Choose two.)
Answer: A,D
Explanation:
Analyze the " Send to Application Layer " Message:
The most critical line in the debug output is: id=65308 ... func=av_receive ... msg= " send to application layer
"
Meaning: This message indicates that the FortiGate kernel is handing the packet over to a user-space daemon (specifically the WAD/Proxy process, indicated by av_receive handlers) for deep inspection.
Implication: This behavior is the hallmark of Proxy-based inspection. In Flow-based inspection, the traffic is handled by the IPS engine (often within the kernel or via specific IPS handlers like ips_measure), and you would not typically see a " send to application layer " message for standard web filtering.
Evaluate Option B (Firewall Policy Mode):
Since the traffic is being sent to the application layer proxy, the Firewall Policy controlling this traffic (Policy ID 1, as seen in Allowed by Policy-1) must be configured with Inspection Mode = Proxy. If it were Flow- based, the traffic would stay in the flow path. Thus, Option B is correct.
Evaluate Option C (Web Filter Profile Mode):
In FortiOS, when a firewall policy is set to Proxy-based inspection, the security profiles (like Web Filter) applied to that policy also operate in Proxy-based inspection mode. The presence of the av_receive function confirms that the content inspection (Web Filter/AV) is being performed by the proxy engine. Thus, Option C is correct.
Why Option A is Incorrect (NPU Offload):
The output shows npu_state=0x100. In the context of a flow trace where traffic is being " sent to application layer, " this confirms the session is not fully offloaded to the NPU (Network Processor). Offloaded traffic (Fast Path) is handled by the hardware and would not generate these specific CPU-level debug logs for the payload inspection phase. The proxying process requires CPU intervention.
Why Option D is Incorrect (Port Mapping):
While valid protocol mapping is necessary for inspection, the specific debug output shown is a direct result of the Inspection Mode (Proxy vs. Flow). The observation of the traffic moving to the application layer is primarily caused by the policy and profile mode settings, making B and C the direct " observations " derived from the log data.
Reference:
FortiGate Troubleshooting (Debug Flow): " If the debug flow shows msg= ' send to application layer ' , it confirms the traffic is being handled by the proxy (WAD) for Proxy-based inspection. "
NEW QUESTION # 67
In the context of SD-WAN, the terms underlay and overlay are commonly used to categorize links.
Which two statements about underlay and overlay links are correct? (Choose two.)
Answer: A,C
Explanation:
The SD-WAN 7.6 Enterprise Administrator Study Guide explicitly defines the relationship between underlays and overlays:
"Overlays are virtual links built on top of physical links-called underlay links." It further explains that the overlay topology consists of VPN tunnels and "adds flexible routing options." Therefore, option B is directly supported.
Option D is also correct. An overlay is not restricted to a particular physical transport. Fortinet identifies ISP, MPLS, and 4G/5G cellular connectivity as possible WAN transports. Consequently, a wireless WAN connection can provide the underlying transport over which an IPsec, GRE, or IP-in-IP overlay tunnel is established.
Option C is incorrect because underlay connectivity is not limited to wired links; cellular 4G/5G is a valid WAN transport.
Option A is incorrect because FortiLink is primarily the proprietary connectivity used between FortiGate and managed LAN extensions such as FortiSwitch and FortiAP. It is not inherently an SD-WAN WAN underlay.
Option E is incorrect because Fortinet identifies VPN tunnels-principally IPsec, but also GRE and IP-in-IP- as SD-WAN overlay links. A VLAN is a Layer 2 logical segmentation mechanism, not an SD-WAN overlay tunnel.
Reference: SD-WAN Overlay Design and Best Practices - Overlay Fundamentals , page 94.
NEW QUESTION # 68
Refer to the exhibit.
An IPsec VPN tunnel using IKEv2 was brought up successfully, but when the tunnel rekey takes place the tunnel goes down.
The debug command for IKE was enabled and, in the exhibit, you can review the partial output of the debug IKE while attempting to bring the tunnel up.
What is causing. The tunnel to be down?
Answer: A
Explanation:
To determine the cause of the failure, we must analyze the IKEv2 debug output provided in the exhibit (image_ad3dc6.jpg):
Identify the Negotiation Phase:
The debug log shows: responder received CREATE_CHILD exchange.
In IKEv2, the CREATE_CHILD_SA exchange is used to create new Child SAs (Phase 2) or to rekey existing ones.
The fact that the tunnel was previously " brought up successfully " implies the initial IKE SA (Phase 1) is stable, and this error is occurring specifically during a rekey event, which often involves Perfect Forward Secrecy (PFS).
Analyze the Proposals (The Mismatch):
Incoming Proposal (Remote Peer):
The remote peer sends a proposal containing two Diffie-Hellman groups: type=DH_GROUP, val=MODP2048 (Group 14) and type=DH_GROUP, val=MODP1536 (Group 5).
My Proposal (Local FortiGate):
The local FortiGate configuration expects: type=DH_GROUP, val=MODP3072 (Group 15).
Result of the Negotiation:
The debug output concludes with: no proposal chosen and Negotiate SA Error.
This error occurs because the local FortiGate cannot find a common Diffie-Hellman group between what it requires (Group 15) and what the peer is offering (Groups 14 or 5).
While this is technically a mismatch occurring during the Phase 2 (Child SA) creation, " A Diffie-Hellman mismatch " (Option A) is the precise root cause identified in the logs.
Why other options are incorrect:
B: The log shows received create-child request, confirming that UDP traffic is reaching the device and is not blocked.
C: The failure is in the CREATE_CHILD exchange (Phase 2/Rekey), not the IKE_SA_INIT or IKE_AUTH (Phase 1) exchanges.
D: While the mismatch is occurring within the Phase 2 definitions, Option A is the specific technical reason for the no proposal chosen error shown in the DH_GROUP lines.
Reference:
FortiGate Security 7.6 Study Guide (IPsec VPN): " Phase 2 parameters... if Perfect Forward Secrecy (PFS) is enabled, a Diffie-Hellman exchange is performed again. Both peers must match the DH Group. "
NEW QUESTION # 69
......
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