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NEW QUESTION # 91
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.)
Answer: A,C
Explanation:
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.
NEW QUESTION # 92
Refer to the exhibit, which shows a partial output of the fssod daemon real-time debug command.
What two conclusions can you draw Itom the output? (Choose two.)
Answer: A,D
NEW QUESTION # 93
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: A
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 # 94
Refer to the exhibit, which shows one way communication of the downstream FortiGate with the upstream FortiGate within a Security Fabric.
What three actions must you take to ensure successful communication? (Choose three.)
Answer: A,C,D
NEW QUESTION # 95
What can cause an IKEv2 tunnel to go down after it was initially brought up successfully?
Answer: B
Explanation:
The correct answer is D.
The study guide explains that IKEv2 has two initial exchanges:
IKE_SA_INIT
IKE_AUTH
and then later exchanges such as:
CREATE_CHILD_SA
It also states the roles of those exchanges:
IKE_SA_INIT negotiates the security settings for IKE traffic
IKE_AUTH performs mutual authentication and sets up the piggyback child SA CREATE_CHILD_SA creates a new child SA or rekeys an existing child SA Most importantly, the study guide explicitly says:
"By IKEv2 design, no Diffie-Hellman public key is exchanged during an IKE_AUTH exchange. Consequently, any phase 2 Diffie-Hellman group configuration mismatch between FortiGate and the peer is experienced only during the first rekey (CREATE_CHILD_SA exchange) of the child SA created during IKE_AUTH." This proves the key idea behind the question: an IKEv2 tunnel can come up successfully first, then fail later during a CREATE_CHILD_SA rekey/renegotiation event because of a phase 2 mismatch. Among the provided options, the matching later-stage cause is mismatched quick-mode selectors during CREATE_CHILD_SA.
Why the other options are wrong:
A is wrong because if the proposal mismatch were in the initial negotiation path, the tunnel would fail during establishment, not after it was already up. The study guide places initial tunnel establishment in IKE_SA_INIT and IKE_AUTH B is wrong because a mismatch in IKE_SA_INIT affects the initial establishment stage, not a tunnel that was already brought up successfully C is wrong because a pre-shared key mismatch is part of authentication during IKE_AUTH, so the tunnel would not come up successfully in the first place
NEW QUESTION # 96
......
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