Fortinet FCSS_NST_SE-7.6 Exam Dumps

The reported symptom---users unable to access any websites despite no explicit blocks in the profile---points to systemic connectivity or configuration issues rather than specific URL filtering rules.

Option B (SSL/TLS Inspection): When Deep Inspection is enabled, the FortiGate acts as a Man-in-the-Middle (MitM) and re-signs server certificates using its own CA. If the clients (browsers) do not trust this CA (i.e., the certificate is not installed in their Trusted Root store), they will reject the connection with certificate errors, effectively preventing access to all HTTPS websites.

Option D (DNS): Web browsing relies on DNS resolution. If the configured DNS server is unreachable or failing, the FortiGate (or the client) cannot resolve FQDNs to IP addresses. Consequently, browsers will fail to load any page, resulting in a total loss of web access.

Option E (License): If the FortiGuard Web Filtering license expires, the FortiGate can no longer query the FortiGuard Distribution Network (FDN) for ratings. By default, or if the allow-when-rating-error setting is disabled (a common security practice), the FortiGate will block all web traffic that it cannot rate, often displaying a 'Web Filter Service Error' or invalid license page.

Option A is incorrect because clearing the cache only increases latency, it does not block traffic. Option C is incorrect because webfilter-force-off is typically used to disable the service (often allowing traffic to bypass checks if the service is down), rather than blocking it.

To display debug output on FortiGate devices, you must always run both the application-specific debug command and the global debug enable command. The commanddiagnose debug application ike -1sets up the detail level for the IKE daemon debug, but it doesnot display any debug output on its own. As described in the FortiOS CLI debugging manuals, the commanddiagnose debug enableactivates debug output on the console, making all previously set debugs visible. This is especially important for VPN troubleshooting---without the enable command, no output appears even if there is VPN traffic.

The correct diagnostic sequence is:

diagnose debug application ike -1

diagnose debug enable

This procedure is found in every FortiOS CLI debug tutorial and troubleshooting workflow.

References:

FortiOS CLI Reference: Debugging VPNs and Real-time Debug Output

FortiGate VPN Troubleshooting Guide: Required Steps for Debug Output

The study guide explicitly explains the FortiGuard flags shown by diagnose debug rating:

D = Default

''IP addresses of servers received from DNS resolution''

It then clarifies even more specifically:

''D = The IP address FortiGate got when resolving the service.fortiguard.net name (usually two or three servers have this flag, if the administrator didn't overwrite the FortiGuard FQDN or IP address in the FortiGate configuration)''

In the exhibit, among the answer choices, the IP address marked with the D flag is 208.91.112.194. Therefore, that is the IP FortiGate got from resolving service.fortiguard.net.

Why the other options are wrong:

B . 209.22.147.36 is not the correct choice because in the exhibit it is not the DNS-resolution entry identified by the D flag

C . 64.26.151.37 has no D flag

D . 96.45.33.65 has no D flag

So the verified answer is: A.

The correct answers are A and C.

The exhibit shows that preserve-session-route is enabled on port1:

config system interface

edit 'port1'

set preserve-session-route enable

next

end

The study guide explains the effect of this setting exactly:

''enable: FortiGate marks existing session routing information as persistent, and applies only the modified routes to new sessions''

It also states:

''The current route must still be present in the FIB. Otherwise, FortiGate flags the session as dirty and reevaluates it''

And the same page further clarifies:

''If you enable this setting, sessions passing through that interface continue to pass without being affected by the routing changes. The routing changes apply only to new sessions. If the route is removed from the FIB, then FortiGate must flag the session as dirty, flush its gateway information, and reevaluate the session.''

This proves:

A is correct because with preserve-session-route enable, existing sessions are normally preserved and routing changes apply only to new sessions.

C is correct because the session remains unchanged unless the current route is removed from the FIB/routing table, in which case FortiGate dirties and reevaluates the session.

Why the other options are wrong:

B is wrong because when the active route is removed, FortiGate does not simply mark the session dirty and stop there. The study guide says it ''flags the session as dirty and reevaluates it'', which means route lookup happens again.

D is wrong because the session does change if the active route is removed. FortiGate flushes gateway information and reevaluates the session.

So the verified answers are: A, C.

The correct answer is B.

In the exhibit:

Neighbor 100.64.1.254 shows State/PfxRcd = 1, which means the session is established and the local FortiGate has received 1 prefix

Neighbor 100.64.2.254 shows State/PfxRcd = Active

The study guide explains the BGP states exactly:

Connect: Waiting for a successful three-way TCP connection

Active: Unable to establish the TCP session

OpenSent: Waiting for an OPEN message from the peer

OpenConfirm: Waiting for the keepalive message from the peer

Established: Peers have successfully exchanged OPEN and keepalive messages

It also explains how to read the State/PfxRcd column:

''If the state is not established, this column displays the BGP state. If the state is established, this column displays the number of prefixes that the local FortiGate received from that neighbor.''

Therefore, because neighbor 100.64.2.254 is in Active state, the correct conclusion is that the BGP adjacency cannot form because the TCP session could not be established.

Why the other options are wrong:

A is wrong because BGP can establish adjacencies with multiple neighbors independently; one established neighbor does not block another

C is wrong because BGP adjacency is not established based on neighbor ''priority''; the output shows adjacency is established because the session completed and prefixes were exchanged

D is wrong because having two neighbors in the same remote AS is valid in BGP and does not prevent adjacency formation

So the verified answer is: B.