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>> FCSS_NST_SE-7.6 Exam Pattern <<
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NEW QUESTION # 22
Refer to the exhibit.
A partial output from an IKE real-time debug is shown
The administrator does not have access to (he remote gateway
Based on the debug output, which two conclusions can you draw? (Choose two.)
Answer: B,D
Explanation:
To determine the correct conclusions, we analyze the specific lines in the IKE real-time debug output provided in the exhibit:
* Analysis for Option A (The remote peer is the initiating peer):
* Evidence: The very first line of the debug output reads: ike 0:624000:98: responder: main mode get 1st message...
* Explanation: The keyword responder indicates that this local FortiGate is receiving the connection request. Consequently, the remote peer must be the initiator sending the request. The phrase "get 1st message" confirms the local unit is receiving the initial packet of the negotiation sequence.
* Conclusion: This statement is True.
* Analysis for Option B (This is a phase 1 negotiation):
* Evidence: The same line mentions main mode.
* Explanation: In IPsec VPNs, Main Mode and Aggressive Mode are exclusively used for Phase
1 (IKE SA) negotiations. Phase 2 (Child SA) negotiations use Quick Mode. The presence of
"main mode" definitively identifies this as a Phase 1 exchange.
* Conclusion: This statement is True.
* Analysis for Option C (There is a Diffie-Hellman group mismatch):
* Evidence:
* Incoming proposal (Remote): Lists type=OAKLEY_GROUP, val=MODP2048 (Group
14) in the first proposal proposal.
* My proposal (Local): Lists type=OAKLEY_GROUP, val=MODP2048 (Group 14).
* Explanation: Since both the remote peer and the local gateway support and are proposing MODP2048 (Group 14), there is no Diffie-Hellman group mismatch. The actual mismatch visible in the logs is between the Encryption/Hash algorithms (Remote proposes AES-256/SHA2-
256, while Local proposes AES-128/SHA), but the DH groups match.
* Conclusion: This statement is False.
* Analysis for Option D (This is a phase 2 negotiation):
* Explanation: As established in the analysis for Option B, "Main Mode" is a Phase 1 protocol. If this were Phase 2, the debug would show "Quick Mode".
* Conclusion: This statement is False.
Reference:
FortiGate Security 7.6 Study Guide (IPsec VPN): "Phase 1 modes: Main mode and Aggressive mode." FortiOS Debugging documentation: Explains that "responder" indicates the device receiving the IKE initialization.
NEW QUESTION # 23
Refer to the exhibit, which shows the output of get router info ospf neighbor.
What can you conclude from the command output?
Answer: B
NEW QUESTION # 24
Refer to the exhibit.
An IPsec VPN tunnel using IKEv2 was brought up successfully, but when the tunnel rekey takes place the tunnel goes down.
The debug command for IKE was enabled and, in the exhibit, you can review the partial output of the debug IKE while attempting to bring the tunnel up.
What is causing. The tunnel to be down?
Answer: C
Explanation:
To determine the cause of the failure, we must analyze the IKEv2 debug output provided in the exhibit (image_ad3dc6.jpg):
Identify the Negotiation Phase:
The debug log shows: responder received CREATE_CHILD exchange.
In IKEv2, the CREATE_CHILD_SA exchange is used to create new Child SAs (Phase 2) or to rekey existing ones.
The fact that the tunnel was previously "brought up successfully" implies the initial IKE SA (Phase 1) is stable, and this error is occurring specifically during a rekey event, which often involves Perfect Forward Secrecy (PFS).
Analyze the Proposals (The Mismatch):
Incoming Proposal (Remote Peer):
The remote peer sends a proposal containing two Diffie-Hellman groups: type=DH_GROUP, val=MODP2048 (Group 14) and type=DH_GROUP, val=MODP1536 (Group 5).
My Proposal (Local FortiGate):
The local FortiGate configuration expects: type=DH_GROUP, val=MODP3072 (Group 15).
Result of the Negotiation:
The debug output concludes with: no proposal chosen and Negotiate SA Error.
This error occurs because the local FortiGate cannot find a common Diffie-Hellman group between what it requires (Group 15) and what the peer is offering (Groups 14 or 5).
While this is technically a mismatch occurring during the Phase 2 (Child SA) creation, "A Diffie-Hellman mismatch" (Option A) is the precise root cause identified in the logs.
Why other options are incorrect:
B: The log shows received create-child request, confirming that UDP traffic is reaching the device and is not blocked.
C: The failure is in the CREATE_CHILD exchange (Phase 2/Rekey), not the IKE_SA_INIT or IKE_AUTH (Phase 1) exchanges.
D: While the mismatch is occurring within the Phase 2 definitions, Option A is the specific technical reason for the no proposal chosen error shown in the DH_GROUP lines.
Reference:
FortiGate Security 7.6 Study Guide (IPsec VPN): "Phase 2 parameters... if Perfect Forward Secrecy (PFS) is enabled, a Diffie-Hellman exchange is performed again. Both peers must match the DH Group."
NEW QUESTION # 25
Refer to the exhibit, which shows the output of diagnose sys session stat.
Which statement about the output shown in the exhibit is correct?
Answer: D
Explanation:
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.
NEW QUESTION # 26
Refer to the exhibit.
The output of the get router info bgp summary command is shown.
Which statement regarding adjacencies between the local router and its neighbors is correct?
Answer: A
Explanation:
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 .
NEW QUESTION # 27
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