Which VLAN is used by FortiGate to place devices that fail to match any configured NAC policies? CRSPAN
Answer : D
In FortiLink NAC for LAN Edge:
When a device first connects, it is placed into theonboarding VLAN.
NAC policies then classify the device (by MAC, OS, user, EMS tag, etc.).
If a NAC policy matches, the device may be moved to anaccess VLANorquarantine VLAN.
Ifno NAC policy matches, the device simplystays in the onboarding VLAN.
FortiOS / LAN Edge documentation describes the onboarding VLAN as thedefault VLAN for unknown or unclassified devices, until NAC policy evaluation moves them elsewhere.
Connectivity tests are being performed on a newly configured VLAN. The VLAN is configured on a FortiSwitch device that is managed by FortiGate. During testing, it is observed that devices
within the VLAN can successfully ping FortiGate. and FortiGate can also ping these devices.
Inter-VLAN communication is working as expected. However, devices within the same VLAN are unable to communicate with each other.
What could be causing this issue?
Answer : A
Observed behavior:
Devices in the VLANcan ping FortiGate gateway reachability OK.
FortiGatecan ping devicesin that VLAN return path OK.
Inter-VLAN routingworks FortiGate's L3 and policies are fine.
Devices in the same VLAN cannot ping each other problem is on theL2 switching plane, not L3.
On FortiSwitch (managed by FortiGate), there is a feature calledAccess VLAN(sometimes described in NAC/dynamic segmentation context):
WhenAccess VLANis enabled on a VLAN, the switchdoes not perform normal L2 forwardingbetween hosts in that VLAN.
Instead, all traffic from endpoints in that VLAN isforced upstream to FortiGate, as if every frame were destined for the gateway.
This is used for designs where you wantall intra-VLAN traffic inspected by the firewall, implementing micro-segmentation.
Resulting behavior:
Host FortiGate: works (frames are forwarded to FortiGate).
FortiGate Host: works (routed back).
Host A Host B (same VLAN):
Frame from A goes to FortiGate.
FortiGate seessource and destination in same subnet; depending on policy, it may drop or not have a policy allowing that traffic.
Even if allowed, certain designs still break pure L2 expectations.
In the exam scenario, the key point is:
IfAccess VLAN is enabled,local L2 communication within that VLAN is disabled, so hosts in the same VLAN cannot communicate directly.
That perfectly explains:
Same VLAN hosts can't ping each other
But they can both reach FortiGate and beyond
Why the other options are less likely / incorrect
B . FortiSwitch MAC address table is missing entries
If MAC table were empty/bad,nothingin that VLAN would work properly, including pinging FortiGate.
C . FortiGate ARP table is missing entries
Then FortiGate couldn't ping the devices either; but it can.
D . Native VLAN misconfigured on ports
That would affect connectivity to FortiGate too, not only host-to-host.
What is the expected behavior when enabling auto TX power control on a FortiAP interface?
Answer : C
Auto TX power control on FortiAP is an RF-optimization feature:
FortiGate (as wireless controller) continuously evaluatesRSSI of associated clientson each FortiAP radio.
The algorithm focuses on theweakest client(the one with the worst signal) and adjusts the AP's transmit power so that this client's signal level stays within a configured / target range.
This helps balance coverage and limit co-channel interference: APs don't transmit at maximum power when clients are close, but will increase power when the weakest client signal drops too low.
Therefore the correct behavior description is:
C-- AP power is adjusted based on the weakest associated client's signal.
Why the others are wrong:
AandBtalk about matching nearby APs' power or forcing everything to --70 dBm, which is not how FortiAP auto TX works.
Dincorrectly states the AP ''evaluates its own transmission from the client perspective''; the AP can only infer client-side conditions from theclient's RSSI at the AP, not the inverse.
You are troubleshooting a Syslog-based single sign-on (SSO) issue on FortiAuthenticator, where user authentication is not being correctly mapped from the syslog messages. You need a tool to diagnose the issue and understand the logs to resolve it quickly.
Which tool in FortiAuthenticator can you use to troubleshoot and diagnose a Syslog SSO issue?
When users are not mapping correctly, you need to see:
Did the syslog message arrive?
Which matching rule (if any) caught it?
What username and IP were extracted?
Why was a message ignored or rejected?
FortiAuthenticator has a dedicated debug area for this:
Debug logs Single Sign-On Syslog SSO
This view shows:
Raw syslog lines received
Thematching ruleapplied (or ''no match'')
Parsed fields (username, IP, group)
Any parsing errors
This is exactly the tool designed totroubleshoot and diagnose Syslog SSO issues.
Why the other options are not the best for this issue
A . Debug logs > Remote Servers > Syslog Viewer
Lets you see syslog traffic in general, but doesnotshow how SSO rules are applied or why they fail. Good for connectivity checks, not SSO logic.
B . Parsing Test Tool
Useful totestpatterns and rules manually by pasting sample log lines, but it doesn't show live traffic or running SSO sessions.
C . Debug logs > SSO Sessions page
Shows existing SSO sessions (who is logged in), but notwhya particular syslog message did not create a session.
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