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問題 #99
Refer to the exhibits,
which show the configuration on FortiGate and partial session information for internet traffic from a user on the internal network. If the priority on route ID 2 were changed from 10 to 0, what would happen to traffic matching that user session? (Choose one answer)
答案：B
解題說明：
The correct answer is A. This behavior is dictated by the configuration command set snat-route-change enable shown in Exhibit 1 under config system global.
* Routing Change: By changing the priority of route ID 2 from 10 to 0, it becomes lower than route ID 1 (priority 5). In FortiOS, a lower priority value indicates a more preferred route. Consequently, the active route for the destination changes from port1 to port2.
* SNAT Implication: The existing session (shown in Exhibit 2) is using Source NAT (SNAT) with the IP address associated with port1 (10.200.1.1). If the traffic were simply switched to port2, the source IP would be incorrect for that interface and the return traffic would likely fail or be dropped.
* snat-route-change enable: This specific setting instructs the FortiGate on how to handle established SNAT sessions when a routing change occurs that alters the preferred outgoing interface. When enabled, if a route change forces an SNAT session to a new interface, FortiGate flushes (deletes) the session from the session table. This is necessary because a live TCP session cannot survive a change in its source IP address. The client must initiate a new session, which will then be created using the new correct route (port2) and the corresponding new SNAT IP.
If this setting were disabled, the session would likely remain "sticky" to the original interface (port1) until it closed, provided the route still existed. However, the explicit configuration forces the deletion.
問題 #100
Refer to the exhibit, which shows the partial output of FortiOS kernel slabs.
Which statement is true?
答案：B
解題說明：
The study guide states:
"The kernel memory slabs are collections of objects with a common purpose. The kernel uses them to store information in memory." It also gives the exact calculation rule:
"Total slab size = available objects x object size"
From the exhibit:
* tcp_session 3 5 1500 ...
So:
* available objects = 5
* object size = 1500
Therefore:
Total slab size = 5 × 1500 = 7500 kB
That makes D correct, and it is associated with the kernel , not user space.
Why the other options are wrong:
* A is wrong because sctp_session 0 0 1600 ... gives 0 × 1600 = 0 , but slabs are associated with the kernel , not user space.
* B is wrong because ip_session 1 3 1200 ... gives 3 × 1200 = 3600 , but again slabs are kernel memory, not user space.
* C is wrong because ip6_session 0 0 1300 ... gives 0 × 1300 = 0 , not 1300.
問題 #101
Refer to the exhibit, which shows a truncated output of a real-time LDAP debug.
What two conclusions can you draw from the output? (Choose two.)
答案：A,B
解題說明：
The exhibit shows these key lines:
* handle_req-Rcvd auth req ... for jsmith in Lab
* start_search_dn-base: ' DC=TAC,DC=ottawa,DC=fortinet,DC=com ' filter:sAMAccountName=jsmith
* get_all_dn-Found DN 1:CN=John Smith,CN=Users,DC=TAC,DC=ottawa,DC=fortinet,DC=com The study guide explicitly shows the same LDAP real-time debug pattern and says the request line includes the LDAP server object name:
handle_req-Rcvd auth req ... for jsmith in Lab ...
That supports A : Lab is the configured LDAP server name being used for this authentication request.
For the LDAP flow stage, the study guide states:
"An fnbamd_ldap_build_dn_search_req-base message indicates that FortiGate is performing step two:
searching for the user in the LDAP tree." It also says that if the LDAP server finds the user, the output shows the user's full DN.
That matches the exhibit's start_search_dn-base ... filter:sAMAccountName=jsmith and Found DN ...
CN=John Smith... lines, so D is correct.
Why the other options are wrong:
* B is wrong because the exhibit shows FortiOS has found the user DN CN=John Smith,..., but that does not mean the user is already authenticating with that DN in this step. The study guide says this DN is discovered in step 2 , and only in step 3 does FortiGate bind using the user DN.
* C is wrong because the exhibit is showing step 2 (Search Request) , not step 3 (Bind Request) . The study guide separates these steps clearly and shows step 3 with fnbamd_ldap_build_userbind_req- Trying DN ... and __ldap_build_bind_req-Binding to ' CN=John Smith,... '
問題 #102
Refer to the exhibit.
The partial output of diagnose sys session stat command is shown.
Which statement about the output shown in the exhibit is correct?
答案：A
解題說明：
The correct answer is C.
The exhibit shows:
562 in ESTABLISHED state
27 in CLOSE state
memory_tension_drop=0
ephemeral=0/131072
According to the study guide, for TCP sessions: "The protocol state in the session table is a two-digit number. For TCP, the first number (from left to right) is related to the server-side state and is 0 when the session is not subject to any inspection (flow or proxy)... The second digit is the client-side state." The same page also shows that value 1 = ESTABLISHED So, if a TCP session is in ESTABLISHED state and there is no inspection, its proto_state is 01:
first digit 0 = no inspection
second digit 1 = ESTABLISHED
That makes C correct. This is also consistent with FortiOS examples showing established TCP sessions with proto=6 proto_state=01 Why the other options are wrong:
A is wrong because the field that indicates sessions dropped due to low free memory is memory_tension_drop, and in the exhibit it is 0, not 113. The study guide states: "If there is a lack of free memory, the kernel deletes the oldest sessions. The command shown on this slide displays the number of sessions the kernel deleted because of this mechanism." So 113 is the clash value, not memory-tension drops.
B is wrong because ephemeral=0/131072 does not mean 131072 ephemeral sessions were recorded. The study guide explains that FortiGate "sets a hard limit on the maximum number of ephemeral sessions that can exist at the same time in the session table." Therefore:
0 = current ephemeral sessions
131072 = maximum allowed ephemeral sessions for that model/context
D is wrong because the study guide says the temporary retention for possible out-of-order packets happens in state value 5 (TIME_WAIT): "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." But the exhibit shows 27 in CLOSE state, and the same table shows CLOSE = 6, not TIME_WAIT So the verified answer is C.
問題 #103
Exhibit.
Refer to the exhibit, which shows the output of diagnose automation test.
What can you observe from the output? (Choose two.)
答案：A,B
問題 #104
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