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| Section | Objectives |
|---|---|
| Topic 1: SD-WAN | - SD-WAN routing - Deployment and troubleshooting - SD-WAN architecture - Performance SLA - Overlay VPN - Application steering |
| Topic 2: Enterprise Firewall | - Authentication and identity - Routing and advanced networking - Troubleshooting - Advanced firewall deployment - High availability - VPN technologies - Security Fabric integration - Centralized management and analytics |
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119. Frage
Exhibit.
Refer to the exhibit, which contains partial output from an IKE real-time debug.
Which two statements about this debug output are correct? (Choose two.)
Antwort: C,D
Begründung:
From the exhibit, you can observe that the debug output captures an IKEv1 negotiation in aggressive mode.
Let ' s break down the supporting details in line with official Fortinet IPsec VPN troubleshooting resources and debug guides:
For Option B:
The very first line of the debug output shows:
comes 10.0.0.2:500- > 10.0.0.1:500, ifindex=7.
This indicates the traffic direction-from the remote IP (10.0.0.2) with port 500 to the local IP (10.0.0.1) with port 500. According to Fortinet ' s documentation, the right side of the arrow always represents the local FortiGate gateway. Thus, 10.0.0.1 is the local gateway IP address.
For Option D:
You see the statement:
negotiation result " remote "
and
received peer identifier FQDNCE88525E7DE7F00D6C2D3C00000000
Official debug documentation describes that the " peer identifier " or peer ID sent by the initiator is displayed here. In the context of IKE/IPsec negotiation, this value is used as the IPsec peer ID for authentication and identification purposes. The initiator is providing " remote " as the peer ID for its connection.
Why Not A or C:
Perfect Forward Secrecy (PFS): The debug does not show any DH group negotiation in phase 2 (no reference to group2, group5, etc., for phase 2), so you cannot deduce the presence of PFS solely from this output.
Phase 2 negotiation: The log focuses on IKE (phase 1) negotiation and establishment; there's no reference to ESP protocol, Quick Mode, or other identifiers that would show phase 2 SA negotiation and establishment.
This interpretation aligns with the explanation in the FortiOS 7.6.4 Administration Guide ' s VPN section and the official debug command output samples published in Fortinet's documentation. It demonstrates how to distinguish between local and remote addresses and how to identify the use of peer IDs.
References:
FortiOS 7.6.4 Administration Guide: IPsec VPN and Debugging VPNs
Technical Support Resources on interpreting IKE debug output and peer ID roles
120. Frage 
The output of a policy route table entry is shown.
Which type of policy route does the output show?
Antwort: D
Begründung:
To determine the type of policy route, we must interpret the specific flags and fields visible in the diagnose firewall proute list (or similar kernel table) output provided in the exhibit Identify Key Indicators:
The most critical field in the output is vwl_service=1(test123).
It also lists vwl_mbr_seq=1 5.
Decode the Terminology:
vwl: This stands for Virtual WAN Link. In FortiOS, " Virtual WAN Link " is the legacy internal name for the SD-WAN feature. Even in newer firmware versions (7.x), the kernel and CLI debugs often still refer to SD- WAN objects as vwl.
vwl_service: This specifically refers to an SD-WAN Rule (also known as an SD-WAN Service). The name (test123) is the name given to that specific SD-WAN rule by the administrator.
Evaluate the Options:
A & D (Regular Policy Route): Standard policy routes (configured under config router policy) do not carry the vwl_service tag. They are typically identified by simple gateway or interface instructions without the SD- WAN service abstraction.
B (ISDB Route): While SD-WAN rules can use the Internet Service Database (ISDB) as a destination, the structure of the route entry shown here-specifically defined by a vwl_service ID-classifies it fundamentally as an SD-WAN rule, regardless of the destination object.
C (An SD-WAN rule): The presence of vwl_service and vwl_mbr_seq (SD-WAN member sequence) definitively identifies this entry as a rule generated by the SD-WAN subsystem.
Conclusion: The output shows a route controlled by the SD-WAN engine (vwl), confirming it is an SD-WAN rule.
Reference:
FortiGate Security 7.6 Study Guide (SD-WAN): " In the kernel routing table and debugs, SD-WAN rules are often referenced as vwl (Virtual WAN Link) services. The vwl_service field indicates the specific SD-WAN rule ID and name. "
121. Frage
Refer to the exhibit.
The output of the command diagnose vpn tunnels liar is shown.
Which two statements accurately describe the status of the tunnel? (Choose two.)
Antwort: B,D
Begründung:
Based on the Fortinet FCSS - Network Security 7.6 documents and the analysis of the VPN tunnel exhibit, here is the verified answer.
Questions no: 91
Verified answer: A, C
Comprehensive and Detailed Explanation with all FCSS - Network Security 7.6 documents:
To determine the status of the VPN tunnel, we must examine the specific counters and fields in the diagnose vpn tunnel list output provided in the exhibit.
Analyze Phase 2 Status (Option A):
The output displays child_num=0.
In IKEv2 (and IKEv1 implementations in FortiOS), " Child SAs " refer to the Phase 2 (IPsec) Security Associations that carry the actual data traffic.
A value of 0 indicates that no Phase 2 tunnels are established. If Phase 2 were up, child_num would be at least
1.
Additionally, under the proxyid section, the field sa=0 confirms there is no active Security Association for that traffic selector.
Analyze Traffic Status (Option C):
The stat line shows: rxp=0 txp=0 rxb=0 txb=0.
rxp (Received Packets) and txp (Transmitted Packets) are both zero. This definitively confirms that no traffic is traversing the tunnel currently. This is expected since Phase 2 is down.
Analyze Phase 1 Status (Why B is incorrect):
The tunnel entry exists in the list with a valid tun_id, and NAT-Traversal is active (natt: mode=keepalive).
The presence of the tunnel in this command output, along with active Keepalive mechanisms, typically indicates that Phase 1 (IKE SA) is established and the peers are communicating on port 4500 (NAT-T), even though the data tunnels (Phase 2) failed to negotiate. If Phase 1 were down, the tunnel would often not appear in this " list " view or would show different status flags indicating a complete connection failure.
Conclusion: The exhibit shows a scenario where the Phase 1 control channel is likely up (evidenced by the entry existence and NATT keepalives), but the Phase 2 data channel is down (child_num=0), resulting in zero traffic flow (rxp=0/txp=0).
122. Frage
Refer to the exhibit, which shows the output of diagnose sys session stat.
Which statement about the output shown in the exhibit is correct?
Antwort: A
Begründung:
The correct answer is D .
The exhibit shows:
* session_count=591
* clash=162
* memory_tension_drop=0
* TCP sessions:
* 166 in NONE state
* 1 in ESTABLISHED state
* 3 in SYN_SENT state
* 2 in TIME_WAIT state
The study guide explains the TCP protocol states and states explicitly:
"When a session is closed by both the sender and receiver, FortiGate keeps that session in the session table for a few seconds, to allow for any out-of-order packets that might arrive after the FIN/ACK packet. This is the state value 5." In diagnose sys session stat, the exhibit shows 2 in TIME_WAIT state . Since TIME_WAIT = state value 5
, those are the sessions being kept briefly for possible out-of-order packets. That makes D correct.
Why the other options are wrong:
* A is wrong because session_count=591 is the total number of sessions, while the TCP sessions shown add up to only 172 (166 + 1 + 3 + 2). So not all sessions in the table are TCP sessions.
* B is wrong because the study guide says the number of sessions deleted because of low free memory is shown by memory_tension_drop , and in the exhibit it is 0 , not 162.
* C is wrong because the study guide defines ephemeral/open TCP sessions as those not fully established , but the exhibit does not say all 166 in NONE state are specifically "waiting to complete the three-way handshake." The clearest directly supported statement from the displayed states is the 2 TIME_WAIT sessions retained for out-of-order packets.
So the verified answer is: D .
123. Frage
What are two reasons you might see iprope_in_check() check failed, drop when using the debug flow?
(Choose two.)
Antwort: A,B
Begründung:
The Network Security Support Engineer 7.6 Study Guide explicitly explains this debug message:
"iprope_in_check() check failed, drop" means the packet is destined to a FortiGate IP address and one of these conditions applies:
* The service is not enabled
* The service is using a different TCP port
* The source IP address is not included in the trusted host list
* The packet matches a local-in policy with action deny
That directly confirms C. Trusted host list misconfiguration .
Why D is the second valid choice:
The FortiOS administration guide explains that:
"IP pools and VIPs are considered local IP addresses if responding to ARP requests on these external IP addresses is enabled ... the FortiGate is considered a destination for those IP addresses ... once an IP pool or VIP has been configured ... the FortiGate considers it as a local address and will not forward traffic based on the routing table." Because iprope_in_check() is a local-in/local-destination type failure, a VIP or IP pool misconfiguration can cause traffic to be treated as destined for the FortiGate itself, which can then trigger this drop condition if the matching local service/local-in handling is not valid. So D is the closest supported second answer from the available choices.
Why the other options are wrong:
* A is wrong because policy route problems are not the documented meaning of this specific debug message. The study guide instead ties iprope_in_check() check failed, drop to management/local-in conditions.
* B is wrong because the study guide says traffic shaping drops appear as: "Denied by quota check"
124. Frage
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