Fortinet Updated FCSS_NST_SE-7.6 Exam Questions and Answers by haleema

The exhibit shows these key lines:

handle_req-Rcvd auth req ... for jsmith in Lab

start_search_dn-base: ' DC=TAC,DC=ottawa,DC=fortinet,DC=com ' filter:sAMAccountName=jsmith

get_all_dn-Found DN 1:CN=John Smith,CN=Users,DC=TAC,DC=ottawa,DC=fortinet,DC=com

The study guide explicitly shows the same LDAP real-time debug pattern and says the request line includes the LDAP server object name:

handle_req-Rcvd auth req ... for jsmith in Lab ...

That supports A : Lab is the configured LDAP server name being used for this authentication request.

For the LDAP flow stage, the study guide states:

“An fnbamd_ldap_build_dn_search_req-base message indicates that FortiGate is performing step two: searching for the user in the LDAP tree.” It also says that if the LDAP server finds the user, the output shows the user’s full DN.

That matches the exhibit’s start_search_dn-base ... filter:sAMAccountName=jsmith and Found DN ... CN=John Smith... lines, so D is correct.

Why the other options are wrong:

B is wrong because the exhibit shows FortiOS has found the user DN CN=John Smith,..., but that does not mean the user is already authenticating with that DN in this step. The study guide says this DN is discovered in step 2 , and only in step 3 does FortiGate bind using the user DN.

C is wrong because the exhibit is showing step 2 (Search Request) , not step 3 (Bind Request) . The study guide separates these steps clearly and shows step 3 with fnbamd_ldap_build_userbind_req-Trying DN ... and __ldap_build_bind_req-Binding to ' CN=John Smith,... '

Intermittent behavior (working sometimes, failing others) points to resource or connectivity fluctuations rather than static misconfigurations.

B. Check that FortiGate is not entering conserve mode:

Reason: When FortiGate enters Conserve Mode (due to high memory usage), it changes its inspection behavior to save resources. Depending on the av-failopen setting, it may either bypass inspection (allowing blocked sites) or drop traffic (blocking valid sites) temporarily until memory recovers. This flapping between states causes intermittent filtering issues.

D. Check that the communication between FortiGate and FortiGuard is stable:

Reason: The Web Filter engine relies on real-time queries to the FortiGuard Distribution Network (FDN) to categorize URLs that are not in the local cache. If the internet connection or the specific path to FortiGuard is unstable (packet loss, latency), queries will time out. This results in " Rating Errors, " which can block or allow traffic unpredictably based on the " Allow websites when a rating error occurs " setting.

Why other options are incorrect:

A: A mismatch in inspection mode (e.g., Profile set to Proxy, Policy set to Flow) is a static configuration error. It would typically result in the profile not being selectable or consistently failing/not applying, rather than working intermittently.

C: If the wrong port is mapped (e.g., HTTP on 8080 is not mapped), the inspection engine will consistently ignore traffic on that port. It would not be intermittent.

The output on FGT-01 confirms that the device is actively encapsulating traffic and sending it as ESP packets (Protocol 50) out of port1 towards the IP address 97.86.16.52. The logs show outgoing packets, which confirms FGT-01 is attempting to initiate or maintain the tunnel and that NAT-Traversal is not being used (as it uses raw ESP).

The output on FGT-02 , however, displays (no packets captured). This is significant because the sniffer command diagnose sniffer packet any ' esp ' captures traffic at the network interface level (ingress), regardless of whether a matching VPN configuration exists on the receiving unit. The absence of packets proves that the ESP traffic generated by FGT-01 is physically not arriving at FGT-02 ' s interface.

This behavior is explained by two primary factors:

Option A (Blocking): An intermediate device, such as an ISP router or firewall, is dropping Protocol 50 traffic. Unlike UDP 500/4500, raw ESP is often blocked by default on many networks or legacy devices.

Option C (Routing/Misconfiguration): If the administrator configured the wrong remote peer IP on FGT-01 , the packets are being routed to a different destination entirely. Consequently, they never arrive at FGT-02 to be captured.

Option B is incorrect because even without a configured VPN tunnel, the sniffer would still display the incoming ESP packets if they were reaching the interface. Option D is incorrect because FGT-01 is sending ESP, making ' esp ' the correct filter.