Fortinet NSE4_FGT_AD-7.6 Practice Test 9

Question 80

A FortiGate forward policy allows group Engineering. After a laptop takes a different DHCP address, the identity monitor still lists its prior address under Engineering. New traffic from the new IP is denied by the default rule. What is the most direct root cause?

The IPsec peer has a Phase 2 proposal mismatch.
The HTTPS web category is incorrect.
The current source IP is not associated with the authenticated Engineering identity in the effective user/IP mapping.
The DHCP option for NTP is not configured.

Explanation

Correct Answer

Identity-based policy matching uses the current endpoint identity/IP state; an old address entry cannot authorize sessions from a new address.

Incorrect Answers

The failure is LAN identity matching on a non-VPN session, not IKE negotiation.

No web-filter decision is reached if user authentication mapping fails the intended firewall policy.

NTP provisioning does not populate the source address into the authenticated identity table.

Question 81

After narrowing a FortiGate policy for a client-to-server TCP service, an engineer needs to demonstrate that new connections use policy 42, while unmatched sources are denied. Which test supplies evidence?

Generate an allowed and denied connection and correlate each actual tuple with the policy ID/action in bounded flow traces or traffic logs.
Confirm that policy 42 exists in the GUI only.
Check the IPS signature database version.
Ping the FortiGate management address from an administrator laptop.

Explanation

Correct Answer

Testing both positive and negative paths proves the intended policy selection rather than simply inspecting the rule configuration.

Incorrect Answers

A configured policy may be shadowed or not match the packet interfaces/addresses.

Signature freshness does not show which policy accepts or denies a particular session.

Local-in management reachability does not test forwarded client/server policy 42.

Question 82

Memory-consuming processes were mitigated on a FortiGate. What acceptance evidence shows conserve mode ended and customer flows recovered?

Observe only that the WAN interface link LED remains on.
Confirm the system exits conserve mode, memory use falls below exit thresholds, and fresh representative sessions are admitted.
Verify a preexisting long-lived TCP session continues.
Increase the monitoring dashboard refresh rate.

Explanation

Correct Answer

Both resource-state and a real new-flow test are needed because an available interface does not prove allocation has recovered.

Incorrect Answers

Physical carrier may be present throughout conserve-mode pressure.

Existing state can survive while creation of new memory-consuming sessions remains constrained.

Changing UI polling cannot verify operating system memory recovery or session admission.

Question 83

The upstream switch claims to send traffic tagged for VLAN20 to FortiGate port5, but the FortiGate has no matching policy logs. What capture result most directly distinguishes switch tagging error from policy denial?

The firewall policy is marked Enabled in the GUI.
A filtered ingress packet capture that shows whether frames with the expected VLAN tag and destination arrive on port5.
An administrator can SSH to port5.
The FortiGuard web-filter service displays an active license.

Explanation

Correct Answer

Packet visibility and tag identity must be established at ingress before attributing the problem to policy processing.

Incorrect Answers

A rule can be enabled even when frames are not delivered on the expected VLAN interface.

Local management reachability does not prove receipt of the affected tagged user flow.

A valid content-filter subscription does not establish Layer 2 delivery.

Question 84

After narrowing an overbroad IPS sensor to relevant protocol signatures, which result should be required before accepting the tuning change?

Show only that CPU use is near zero after disabling the IPS sensor entirely.
Confirm that the FortiGate GUI password still works.
Repeat the same load and known-safe attack test set: inspection-worker CPU/p95 latency should improve while required IPS blocks and alerts remain correct.
Compare WAN interface labels before and after tuning.

Explanation

Correct Answer

Resource relief alone could come from disabling detection; the control must still identify/block its declared threat cases.

Incorrect Answers

Turning off inspection may reduce CPU but violates the required protection control.

Administrator login is not a measure of IPS detection or scanning cost.

Interface display names cannot prove CPU improvement or IPS signature coverage.

Question 85

After replacing a faulty optic on a FortiGate uplink, the carrier remains up for a few seconds. What evidence is needed before closing the repeated link-reset incident?

Check only that a new administrator can log into the web UI.
Raise the firewall traffic-log retention to thirty days.
Observe stable expected speed/duplex during a representative interval and confirm CRC/link-error counters no longer climb.
Disable the application-control profile on a client policy.

Explanation

Correct Answer

A transient link-up event is insufficient; negotiated-state stability and error trends validate the physical correction.

Incorrect Answers

GUI login may use another interface and does not test the repaired optic.

Retention helps audit history but cannot prove a physical negotiation fault has stopped.

Changing application classification is not a verification of Ethernet link health.

Question 86

A FortiGate's system DNS was corrected. Which paired result demonstrates that the name-resolution fault is fixed rather than merely proving that routing works?

Ping only a known numeric public address.
Check that the FortiGuard IPS database has the latest version.
Resolve the affected hostname to the expected address through the configured DNS resolver and then connect to that resolved endpoint.
Increase SD-WAN packet duplication on both WAN links.

Explanation

Correct Answer

The positive DNS response proves name lookup while the subsequent reachability check tests the actual destination; numeric IP pings alone omit the original failure.

Incorrect Answers

Numeric ping tests routing, not the DNS name-resolution path that was broken.

IPS update currency is separate from a successful DNS A/AAAA lookup.

Duplicated probes cannot substitute for observing a valid resolver answer.

Question 87

An AWS team needs NGFW inspection for VPC workloads but has no staff to install FortiOS patches, operate virtual firewalls or engineer autoscaling. It can manage security policy centrally. Which Fortinet offering matches that operating model?

A self-managed FortiGate-VM EC2 instance without an HA design.
A standalone FortiAnalyzer logger with no firewall in the traffic path.
A default AWS VPC route table with no inspection target.
FortiGate Cloud Native Firewall (CNF), subject to its supported AWS region, workload routing and policy capabilities.

Explanation

Correct Answer

FortiGate CNF is Fortinet's cloud-native NGFW as a service: the service manages the firewall software infrastructure, availability and scaling while customers manage policies.

Incorrect Answers

A VM still requires customer-owned deployment, patching, instance sizing and operational responsibility.

FortiAnalyzer stores and reports logs; it does not replace NGFW enforcement for transit workloads.

Routing alone does not provide Fortinet IPS, application control or NGFW policies.

Question 88

An enterprise in AWS must run custom FortiOS CLI automation, attach explicitly chosen EC2 network interfaces and control when the FortiOS image is upgraded. Which deployment is more suitable than the managed CNF service?

FortiGate CNF with an expectation of SSH access to its underlying managed firewall operating system.
A supported FortiGate-VM on EC2, with validated image, licensing, interface and cloud routing prerequisites.
FortiAnalyzer with an EC2 ENI but no FortiGate.
Only AWS route tables and a public S3 bucket.

Explanation

Correct Answer

FortiGate-VM gives the tenant control over the FortiOS virtual appliance and its network placement; CNF abstracts the software infrastructure.

Incorrect Answers

CNF is a managed NGFW service, not a self-managed FortiOS guest with customer-owned image lifecycle.

Log analytics cannot satisfy on-box FortiOS firewall CLI administration or enforcement.

Neither is a FortiOS firewall instance that can run custom appliance configuration.

Question 89

A FortiGate-VM sees client SYN packets from a protected VPC subnet, but server replies go directly to a transit gateway and the FortiGate session never completes. Which VPC control must be corrected?

Increase FortiGate application-control signature severity.
Disable HTTPS administrator access on the FortiGate.
Align the return-side subnet or transit-gateway route tables so reply traffic traverses the same FortiGate-VM inspection path.
Change the FortiGate GUI timezone.

Explanation

Correct Answer

Stateful firewall inspection depends on seeing the relevant packet directions; AWS routes on both ingress and return segments must be consistent with the intended inspection architecture.

Incorrect Answers

Application inspection cannot recover return packets routed around the firewall.

Management-plane HTTPS exposure does not repair data-plane route asymmetry.

A timezone setting has no effect on VPC routing or stateful return traffic.

Question 90

An AWS deployment template assumes every EC2 size and ENI type provides identical packet acceleration for FortiGate-VM. Which design gate prevents an unsupported performance plan?

Choose the cheapest EC2 type and assume all network acceleration features exist.
Set an IPS profile to high security to enable SR-IOV automatically.
Increase the EC2 instance hostname length.
Check the FortiGate-VM 7.6.0 platform compatibility matrix, supported EC2 instance type, NIC/SR-IOV capabilities and licensing limits.

Explanation

Correct Answer

Acceleration and throughput are functions of supported FortiGate VM images, instance type, driver and license, not of the VPC name.

Incorrect Answers

AWS instance families differ in virtual NIC capabilities and FortiGate support.

Security profile selection does not add unsupported virtual NIC capabilities.

DNS or host naming cannot change virtual hardware acceleration support.

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Question 80

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Question 81

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Question 82

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Question 83

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Question 84

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Question 85

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Question 86

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Question 87

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Question 88

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Question 89

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Question 90

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Fortinet NSE 4 - FortiOS 7.6 Administrator (NSE4_FGT_AD-7.6) Practice Tests