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[Hardware] FCSS_NST_SE-7.6全真問題集、FCSS_NST_SE-7.6最新対策問題

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【Hardware】 FCSS_NST_SE-7.6全真問題集、FCSS_NST_SE-7.6最新対策問題

Posted at yesterday 19:53      View：18 | Replies：0        Print      Only Author   [Copy Link] 1#
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Fortinet FCSS - Network Security 7.6 Support Engineer 認定 FCSS_NST_SE-7.6 試験問題 (Q33-Q38):質問 # 33
Refer to the exhibit, which shows partial outputs from two routing debug commands.

Which change must an administrator make on FortiGate to route web traffic from internal users to the internet, using ECMP?
  • A. Set preserve-session-route to enable.
  • B. Set the priority of the static default route using port1 to 10.
  • C. Set the priority of the static default route using port2 to 1.
  • D. Set snat-route-change to enable.
正解：B

質問 # 34
When FortiGate enters conserve mode because of memory pressure, which action can FortiGate perform to preserve memory?
  • A. Fortigate begins dropping all new sessions to protect resources.
  • B. FortiGate switches to a less memory-intensive inspection mode, such as flow-based inspection.
  • C. FortiGate reduces or stops non-essential processes tike logging and antivirus scanning
  • D. FortiGate automatically reboots to clear memory and restore full operation.
正解：A
解説：
When the FortiGate enters Conserve Mode due to high memory pressure (specifically reaching the Extreme Threshold at 95% memory usage, or the Red Threshold for proxy traffic), the system prioritizes stability and preventing a system crash (kernel panic).
D). FortiGate begins dropping all new sessions to protect resources:
In Extreme Conserve Mode (95%), the FortiGate kernel acts to preserve the remaining memory for system- critical tasks (like admin access and basic packet forwarding of existing sessions). To achieve this, it drops all new session initiation requests regardless of the inspection type.
In Red Conserve Mode (88%), it specifically drops new sessions that require proxy-based inspection (as these consume the most memory), while often still allowing flow-based traffic.
Among the provided choices, "dropping new sessions" is the only standard protective mechanism FortiOS employs to stop memory usage from climbing further.
Why other options are incorrect:
A: FortiGate does not automatically reboot in conserve mode; it attempts to recover by restricting traffic.
(Reboot is a last-resort crash, not a configured action).
B: Inspection modes (Proxy vs. Flow) are defined in firewall policies and cannot be dynamically switched by the system during runtime.
C: The system does not arbitrarily stop "non-essential processes" like logging or AV. Logging is critical for audit trails. While av-failopen can be configured to bypass scanning, the system typically defaults to "Fail- Close" (dropping traffic) rather than stopping the engines themselves.
Reference:
FortiGate Security 7.6 Study Guide (Diagnostics & Resource Usage): "When memory usage reaches the extreme threshold (95%), all new sessions are dropped to prevent memory exhaustion."

質問 # 35
Which statement about IKEv2 is true?
  • A. IKEv1 and IKEv2 have enough of the header format in common that both versions can run over the same UDP port.
  • B. IKEv1 and IKEv2 use same TCP port but run on different UDP ports.
  • C. IKEv1 and IKEv2 share the concept of phase1 and phase2.
  • D. Both IKEv1 and IKEv2 share the feature of asymmetric authentication.
正解：C
解説：
IKEv1 (Internet Key Exchange version 1) and IKEv2 are protocols used for establishing IPsec VPN tunnels, and both protocols share the conceptual division into two phases, as clearly described in Fortinet VPN documentation:
* Phase 1 handles negotiation and establishment of a secure IKE Security Association (SA) between peers.
* Phase 2 negotiates parameters for the IPsec Security Association, which secures actual data traffic between peers.
While IKEv2 streamlines and improves upon IKEv1 by merging some message exchanges and simplifying configuration, it maintains the same core two-phase concept: Phase 1 (IKE SA) and Phase 2 (IPsec SA). This is a foundational VPN concept referenced widely in both IKEv1 and IKEv2 literature.
Other statements are incorrect:
* Asymmetric authentication is possible, but not mandatory for both.
* Both protocols commonly use UDP port 500, sometimes 4500 for NAT traversal, but they are not designed to run on TCP.
* The protocol feature compatibility over TCP/UDP is not correctly described in the other options.
Reference:
FortiOS Administration Guide: IPsec VPN, "IKEv1 vs. IKEv2 Concepts and Phase Negotiations" RFCs and Fortinet VPN solution guides on phase structure

質問 # 36
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.)
  • A. There is currently no traffic traversing the tunnel
  • B. Phase 2 is down
  • C. Both Phase 1 and Phase 2 were negotiated successfully.
  • D. Phase 1 is down.
正解：A、B
解説：
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).

質問 # 37
Which Iwo troubleshooting steps should you perform lf you encounter issues with intermittent web filter behavior? (Choose two.)
  • A. Check that the correct port is mapped to HTTP in the Protocol Options
  • B. Check that the inspection mode configured for the web filter profile matches that of the firewall policy where it is applied.
  • C. Check that the communication between FortiGate and FortiGuard is stable
  • D. Check that FortiGate is not entering conserve mode.
正解：C、D
解説：
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.
Reference:
FortiGate Security 7.6 Study Guide (Web Filter): "If the connection to FortiGuard is unstable, users may experience delays or rating errors... Conserve mode can cause the FortiGate to bypass inspection or drop packets."

質問 # 38
......
CertShikenのFCSS_NST_SE-7.6問題集というものをきっと聞いたことがあるでしょう。でも、利用したことがありますか。「CertShikenのFCSS_NST_SE-7.6問題集は本当に良い教材です。おかげで試験に合格しました。」という声がよく聞こえています。CertShikenは問題集を利用したことがある多くの人々からいろいろな好評を得ました。それはCertShikenはたしかに受験生の皆さんを大量な時間を節約させ、順調に試験に合格させることができますから。
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