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| Section | Objectives |
|---|---|
| SD-WAN | - SD-WAN routing - Overlay VPN - SD-WAN architecture - Application steering - Performance SLA - Deployment and troubleshooting |
| Enterprise Firewall | - High availability - Security Fabric integration - Advanced firewall deployment - Routing and advanced networking - Troubleshooting - Centralized management and analytics - Authentication and identity - VPN technologies |
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질문 # 75
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.)
정답：C,D
설명：
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).
질문 # 76
Refer to the exhibit, which contains the output of diagnose vpn tunnel list.
Which command will capture ESP traffic for the VPN named DialUp_0?
정답：A
질문 # 77
Which two protocol states indicate that traffic is bidirectional? (Choose two.)
정답：B,D
설명：
The correct answers are A and B.
For UDP, the study guide states this directly: "For UDP, the session state can have only two values: 00 when traffic is only one way, and 01 when traffic is two ways. For ICMP, the protocol state is always 00." That makes B correct and D incorrect.
For TCP, the study guide explains that the protocol state is a two-digit number, where the first digit is the server-side state and the second digit is the client-side state. It also states that the first digit is 0 when the session is not subject to any inspection, and the TCP state table shows that value 1 = ESTABLISHED So, for a normal non-proxied/non-inspected TCP session, proto_state=01 means the TCP session is in the ESTABLISHED state. An established TCP session means the three-way handshake has completed, which requires traffic in both directions. That is why A is correct.
The study guide also says: "proto_state=11 means that the TCP three-way handshake for both server-side and client-side is completed (ESTABLISHED)." This confirms that TCP state value 1 represents an established state.
Why C is not selected: the study guide defines value 5 as TIME_WAIT and says: "When a session is closed by both the sender and receiver, FortiGate keeps that session in the session table for a few seconds... This is the state value 5." So proto_state=05 represents a closing/closed TCP session in TIME_WAIT, not the normal bidirectional state the question is testing.
Therefore, the verified answers are A and B.
질문 # 78
Refer to the exhibit.
Partial output of diagnose sys session stat command is shown.
An administrator has noticed unusual behavior from FortiGate. It appears that sessions are randomly removed.
Which two reasons could explain this? (Choose two.)
정답：B,C
설명：
To determine why sessions are being removed, we must interpret the specific counters in the diagnose sys session stat output provided in the exhibit.
Analyze memory_tension_drop (Reason A):
Observation: The output shows memory_tension_drop=4.
This counter specifically increments when the FortiGate kernel attempts to allocate a new memory page for a session but fails due to a lack of available system memory. As a result, the session creation is aborted or an existing session is dropped to free up resources. This confirms that the kernel is struggling to allocate memory pages.
Analyze extreme_low_mem (Reason D):
Observation: The output shows extreme_low_mem=0 (which is good), but we must look at the context of memory_tension_drop.
Context: While the extreme_low_mem counter itself is 0 in this snapshot, the presence of memory_tension_drop indicates the system is under memory pressure. Furthermore, in many Fortinet exam contexts involving this specific exhibit, the focus is on the mechanism of " flushing sessions " to recover memory.
Refinement: Actually, look closer at the exhibit. It shows flush=787.
The flush counter indicates the number of times the system has actively purged (flushed) old or stale sessions from the table to recover memory or due to policy changes. A high flush count combined with memory tension drops strongly suggests the system is aggressively removing sessions to handle high memory usage.
Therefore, " FortiGate is flushing sessions because of high memory usage " is the correct interpretation of the flush and memory_tension_drop counters working together.
Why other options are incorrect:
B: There is no counter in this specific output (like tcp_syn_sent drop) that indicates dropping incomplete handshakes. The clash=0 and delete=0 counters are low/zero.
C: The dev_down=16/120 field does not mean the device was down for 10 seconds. It refers to device index pointers or internal kernel interface states, not system uptime/downtime impacting session acceptance in the way described.
Reference:
FortiGate Troubleshooting Guide (System Resources): " The memory_tension_drop counter indicates sessions dropped due to kernel memory exhaustion. The flush counter indicates sessions removed to free up table space. "
질문 # 79
Refer to the exhibit.
The network diagram shows the addition of Site 2 with an overlapping network segment to the existing IPsec VPN connection between the hub and Site 1.
Which IPsec phase 2 configuration must you make on the FortiGate hub to enable equal-cost multipath (ECMP) routing when multiple remote sites connect with overlapping subnets?
정답：A
설명：
Comprehensive and Detailed 100 to 150 words of Explanation From Secure Networking Architect Study Guides topics:
Fortinet documents three values for the phase 2 route-overlap setting: use-new, use-old, and allow. The required value for simultaneous VPNs advertising overlapping remote subnets is allow.
With route-overlap allow, FortiGate keeps the existing dial-up VPN active and also accepts the newly connected VPN. The Enterprise Firewall 7.6 Administrator Study Guide explicitly states that traffic from the central FortiGate is then load-balanced using equal-cost multipath across both VPNs. This directly satisfies the scenario and makes C correct.
The default use-new setting disconnects the existing VPN and accepts the new one, while use-old keeps the existing VPN and rejects the new connection. Neither produces ECMP. multipath enable and net-device ecmp are not the phase 2 commands FortiOS uses to permit overlapping dial-up VPN routes.
질문 # 80
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