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NEW QUESTION # 55
Which two protocol states indicate that traffic is bidirectional? (Choose two.)
Answer: B,C
Explanation:
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.
NEW QUESTION # 56
Refer to the exhibits.
An OSPF peer is advertising route 172.16.52.0/24. The local FortiGate is configured with an inbound distribution list that allows the 172.16.0.0/16 network to be injected into its routing table. However, the 1 '
2.16.52.0/24 subnet cannot be seen in the FIB.
Which two stops can the administrator of the local FortiGate take to ensure that the advertised 172.16. 52.0/24 subnet will be injected into the routing table? (Choose two.)
Answer: C,D
Explanation:
The issue is caused by the strict matching logic of the configured Prefix List.
Current State: The rule is edit 1 with set prefix 172.16.0.0 255.255.0.0 and both ge (greater than or equal) and le (less than or equal) are unset.
Behavior: When ge and le are unset, FortiOS requires an exact match of the subnet mask. The current rule only matches the exact network 172.16.0.0/16. It denies 172.16.52.0/24 because the mask (/24) does not match the rule ' s mask (/16).
To fix this and inject 172.16.52.0/24, you must modify the list to match the /24 mask:
A). Add another entry to the prefix list to specifically allow the 172.16.52.0/24 network:
Creating a new rule (e.g., edit 2) with set prefix 172.16.52.0 255.255.255.0 will provide an exact match for the incoming route, allowing it to pass the distribute-list.
B). Change the ge value to 17:
By configuring set ge 17 on the existing rule (conceptually 172.16.0.0/16 ge 17), you change the logic from " exact match " to " range match " .
This configuration tells the router to match any prefix starting with 172.16.x.x that has a subnet mask length of 17 or greater.
Since the incoming route is a /24, and 24 is greater than 17, the route will match the prefix list and be accepted.
Why other options are incorrect:
C: The option text appears to read " Change the ... value to 16 " . If this refers to le 16, it would enforce the mask to be exactly /16 or less, which still excludes /24.
D: Changing the default behavior to implicit allow defeats the purpose of a filter (security control) and is not a standard configuration step for fixing a single missing route.
Reference:
FortiGate Security 7.6 Study Guide (Routing): " In prefix-lists, if ge and le are not used, the subnet mask must match exactly. To match subnets within a range, you must define the prefix length boundaries using ge or le. "
NEW QUESTION # 57
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.)
Answer: A,C
Explanation:
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.
* Explanation: 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.
* Explanation: 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."
NEW QUESTION # 58
Refer to the exhibit.
An IPsec VPN tunnel is dropping, as shown by the debug output.
Analyzing the debug output, what could be causing the tunnel to go down?
Answer: A
NEW QUESTION # 59
Refer to the exhibits.
An OSPF peer is advertising route 172.16.52.0/24. The local FortiGate is configured with an inbound distribution list that allows the 172.16.0.0/16 network to be injected into its routing table. However, the
1'2.16.52.0/24 subnet cannot be seen in the FIB.
Which two stops can the administrator of the local FortiGate take to ensure that the advertised 172.16. 52.0/24 subnet will be injected into the routing table? (Choose two.)
Answer: C,D
Explanation:
The issue is caused by the strict matching logic of the configured Prefix List.
* Current State: The rule is edit 1 with set prefix 172.16.0.0 255.255.0.0 and both ge (greater than or equal) and le (less than or equal) are unset.
* Behavior: When ge and le are unset, FortiOS requires an exact match of the subnet mask. The current rule only matches the exact network 172.16.0.0/16. It denies 172.16.52.0/24 because the mask (/24) does not match the rule's mask (/16).
To fix this and inject 172.16.52.0/24, you must modify the list to match the /24 mask:
* A. Add another entry to the prefix list to specifically allow the 172.16.52.0/24 network:
* Creating a new rule (e.g., edit 2) with set prefix 172.16.52.0 255.255.255.0 will provide an exact match for the incoming route, allowing it to pass the distribute-list.
* B. Change the ge value to 17:
* By configuring set ge 17 on the existing rule (conceptually 172.16.0.0/16 ge 17), you change the logic from "exact match" to "range match".
* This configuration tells the router to match any prefix starting with 172.16.x.x that has a subnet mask length of 17 or greater.
* Since the incoming route is a /24, and 24 is greater than 17, the route will match the prefix list and be accepted.
Why other options are incorrect:
* C: The option text appears to read "Change the ... value to 16". If this refers to le 16, it would enforce the mask to be exactly /16 or less, which still excludes /24.
* D: Changing the default behavior to implicit allow defeats the purpose of a filter (security control) and is not a standard configuration step for fixing a single missing route.
Reference:
FortiGate Security 7.6 Study Guide (Routing): "In prefix-lists, if ge and le are not used, the subnet mask must match exactly. To match subnets within a range, you must define the prefix length boundaries using ge or le."
NEW QUESTION # 60
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