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| Section | Objectives |
|---|---|
| Enterprise Firewall | - VPN technologies - Troubleshooting - High availability - Advanced firewall deployment - Centralized management and analytics - Security Fabric integration - Authentication and identity - Routing and advanced networking |
| SD-WAN | - SD-WAN architecture - Overlay VPN - SD-WAN routing - Deployment and troubleshooting - Application steering - Performance SLA |
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質問 # 92
Refer to the exhibit.
You want to configure SD-WAN on a network, as shown in the exhibit. The network contains many FortiGate devices. Some are used as next-generation firewalls (NGFWs), and some are deployed with extensions such as FortiSwitch, FortiAP, or FortiExtender.
Which factor should you consider when planning the deployment? (Choose one answer.)
正解：B
解説：
The SD-WAN 7.6 Enterprise Administrator Study Guide states: "An SD-branch is a site with an SD-WAN spoke FortiGate device and one or multiple extensions." It explains that FortiSwitch and FortiAP provide wired and wireless LAN connectivity through FortiLink, while FortiExtender supplements WAN connectivity by providing 4G/5G transport.
The guide further explains that the management plane sees extension-device ports as logical interfaces belonging to the controlling FortiGate. Therefore, FortiSwitch, FortiAP, and FortiExtender do not become independent SD-WAN topology nodes and do not require separate topologies. FortiGate devices with FortiLink connections also do not need to be excluded.
FortiExtender is specifically designed as a natural SD-WAN extension that introduces cellular connectivity as another WAN transport. Consequently, a FortiGate using FortiExtender can function as a hub, provided it satisfies the required capacity, routing, and IPsec design requirements. There is no rule requiring hubs to be extension-free. Therefore, option D correctly describes the unified topology shown in the exhibit.
質問 # 93
When FortiGate enters conserve mode because of memory pressure, which action can FortiGate perform to preserve memory?
正解：C
解説：
The best verified answer is C .
The study guide says that when FortiGate is in conserve mode, it activates protection measures to recover memory space:
* "System configuration cannot be changed"
* "FortiGate skips quarantine actions (including FortiSandbox analysis)" It also explains that inspection behavior can be reduced while in conserve mode:
* "pass (default): All new sessions pass without inspection until FortiGate switches back to non- conserve mode."
* "The av-failopen setting also applies to flow-based antivirus inspection." The FortiOS administration guide summarizes this behavior as:
"This causes functions such as antivirus scanning to change how they operate to reduce the functionality and conserve memory without compromising security." That is why C is the closest correct choice: FortiGate can reduce functionality of some processes, especially antivirus-related inspection, to preserve memory.
Why the other options are wrong:
* A is wrong because FortiGate does not automatically reboot as a default conserve-mode action. A reboot can be configured through an automation stitch , but that is an optional administrator-defined response, not the built-in conserve-mode behavior
* B is wrong because the documentation does not say FortiGate switches from proxy-based inspection to flow-based inspection. Instead, it may pass traffic without inspection depending on av-failopen settings
* D is not generally correct for conserve mode . The study guide says FortiGate starts dropping new sessions only when memory usage exceeds the extreme threshold : "If memory usage exceeds the extreme threshold, all new sessions that require inspection (flow-based or proxy-based) are blocked." So the verified answer is: C .
質問 # 94
Refer to the exhibit.
Partial output of a real-time OSPF debug is shown.
Which two reasons explain why the two FortiGate devices are unable to form an adjacency? (Choose two.)
正解：C、D
解説：
To determine the correct reasons for the adjacency failure, we must analyze the standard OSPF real-time debug output (diagnose ip router ospf all enable or diagnose sniffer packet) typically provided in this exam exhibit.
Analyze the Debug Output:
The debug output in this specific question scenario typically displays an incoming Hello packet line: OSPF:
RECV[Hello]: ... auth-type 0 ...
" RECV " : Indicates the packet is coming from the Remote peer.
" auth-type 0 " : Indicates the Remote peer is sending " Null " (No) authentication.
Analyze the Failure:
The adjacency fails because the Local FortiGate is rejecting this packet.
If the Local FortiGate accepts " No Authentication " , it would match auth-type 0 and form the adjacency.
Since it is failing (and producing a debug log), the Local FortiGate must be expecting a different authentication type (Type 1 Cleartext or Type 2 MD5).
Evaluate the Options:
A). The remote peer has either OSPF cleartext or MD5 authentication configured.
Incorrect. The debug shows auth-type 0 (No Auth) coming from the remote peer.
B). There is an OSPF authentication configuration mismatch.
Correct. One side is sending " No Auth " (Remote), and the other expects " Auth " (Local). This is a definition of a mismatch.
C). The local FortiGate does not have OSPF authentication configured.
Incorrect. If the Local unit had " No Auth " configured, it would match the Remote ' s auth-type 0, and the adjacency would come up. The failure implies the Local unit does have auth configured.
D). The local FortiGate has either OSPF cleartext or MD5 authentication configured.
Correct. Because the Local unit is rejecting the " No Auth " packet from the remote peer, it confirms that the Local unit has authentication enabled (expecting Type 1 or 2).
Conclusion: The breakdown of the OSPF negotiation shows that the Remote peer is sending no authentication (Type 0), while the Local FortiGate expects authentication, resulting in a mismatch.
Reference:
FortiGate Security 7.6 Study Guide (OSPF Troubleshooting): " Authentication mismatch is a common cause of OSPF adjacency failure. Debug commands (diagnose ip router ospf all enable) reveal the auth-type received versus expected. " FortiGate CLI Reference: auth-type 0 = Null (None), auth-type 1 = Simple (Cleartext), auth-type 2 = MD5.
質問 # 95 
The output of a policy route table entry is shown.
Which type of policy route does the output show?
正解：B
解説：
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. "
質問 # 96
Refer to the exhibits.
Exhibit - Routing tables of FortiGate_A and FortiGate_B
The routing tables of FortiGate_A and FortiGate_B are shown.
FortiGate_A and FortiGate_B are in the same autonomous system.
You want to add only route 172.16.1.248/30 on FortiGate_A by updating the BGP configuration.
Which configuration must you apply?
正解：B
解説：
" By default, the prefix is advertised only when it matches the destination subnet of an active route in the routing table " Technical Explanation:
The exhibit shows that FortiGate_B has the network 172.16.1.248/30 installed as a directly connected route.
The administrator wants to advertise this specific network to FortiGate_A through BGP without unintentionally advertising other connected networks.
Option D is correct because the BGP network command allows an administrator to originate a specific prefix into BGP.
An appropriate configuration on FortiGate_B is:
config router bgp
config network
edit 1
set prefix 172.16.1.248 255.255.255.252
next
end
end
By default, FortiOS checks whether the configured prefix exactly matches an active route in the routing table before originating the advertisement.
Because 172.16.1.248/30 is directly connected to FortiGate_B, this condition is satisfied.
FortiGate_B can therefore originate that prefix, allowing FortiGate_A to learn it through the established BGP session.
Why the other options are incorrect:
Option A: An inbound route map on FortiGate_A can filter or modify routes already advertised by its neighbor, but cannot cause FortiGate_B to originate the missing prefix.
Option B: Redistribute Connected can introduce multiple connected routes into BGP. Without suitable filtering, this would advertise more networks than the administrator intends.
Option C: An outbound route map can filter advertisements, but does not independently originate a connected prefix that has not been redistributed or declared using the BGP network command.
Architectural Consideration:
When a requirement specifies that only one prefix must be advertised, the BGP network statement offers precise control. Route maps can provide additional policy enforcement, but they do not replace the mechanism required to originate the prefix.
References: Enterprise Firewall 7.6 Administrator Study Guide, Dynamic Routing Supplement - Network Command, pages 345-346.
質問 # 97
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