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An OT network consists of multiple FortiGate devices. The edge FortiGate device is deployed as the secure gateway and is only allowing remote operators to access the ICS networks on site. Management hires a third-party company to conduct health and safety on site. The third-party company must have outbound access to external resources. As the OT network administrator, what is the best scenario to provide external access to the third-party company while continuing to secure the ICS networks?
Refer to the exhibit. You are assigned to implement a remote authentication server in the OT network. Which part of the hierarchy should the authentication server be part of?
To increase security protection in an OT network, how does application control on ForliGate detect industrial traffic?
An OT architect has deployed a Layer 2 switch in the OT network at Level 1 the Purdue model-process control. The purpose of the Layer 2 switch is to segment traffic between PLC1 and PLC2 with two VLANs. All the traffic between PLC1 and PLC2 must first flow through the Layer 2 switch and then through the FortiGate device in the Level 2 supervisory control network. What statement about the traffic between PLC1 and PLC2 is true?
As an OT administrator, it is important to understand how industrial protocols work in an OT network. Which communication method is used by the Modbus protocol?
An OT administrator is defining an incident notification policy using FortiSIEM and would like to configure the system with a notification policy. If an incident occurs, the administrator would like to be able to intervene and block an IP address or disable a user in Active Directory from FortiSIEM. Which step must the administrator take to achieve this task?
With the limit of using one firewall device, the administrator enables multi-VDOM on FortiGate to provide independent multiple security domains to each ICS network. Which statement ensures security protection is in place for all ICS networks?
Which three common breach points can be found in a typical OT environment? (Choose three.)
As an OT network administrator, you are managing three FortiGate devices that each protect different levels on the Purdue model. To increase traffic visibility, you are required to implement additional security measures to detect exploits that affect PLCs. Which security sensor must implement to detect these types of industrial exploits?
Refer to the exhibit. An OT architect has implemented a Modbus TCP with a simulation server Conpot to identify and control the Modus traffic in the OT network. The FortiGate-Edge device is configured with a software switch interface ssw-01. Based on the topology shown in the exhibit, which two statements about the successful simulation of traffic between client and server are true? (Choose two.)

Question 38 - NSE7_OTS-7.2 discussion

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Refer to the exhibit.

An OT network security audit concluded that the application sensor requires changes to ensure the correct security action is committed against the overrides filters.

Which change must the OT network administrator make?

A.
Set all application categories to apply default actions.
Answers
A.
Set all application categories to apply default actions.
B.
Change the security action of the industrial category to monitor.
Answers
B.
Change the security action of the industrial category to monitor.
C.
Set the priority of the C.BO.NA.1 signature override to 1.
Answers
C.
Set the priority of the C.BO.NA.1 signature override to 1.
D.
Remove IEC.60870.5.104 Information.Transfer from the first filter override.
Answers
D.
Remove IEC.60870.5.104 Information.Transfer from the first filter override.
Suggested answer: D

Explanation:

According to the Fortinet NSE 7 - OT Security 6.4 exam guide1, the application sensor settings allow you to configure the security action for each application category and network protocol override. The security action determines how the FortiGate unit handles traffic that matches the application category or network protocol override. The security action can be one of the following:

Allow: The FortiGate unit allows the traffic without any further inspection.

Monitor: The FortiGate unit allows the traffic and logs it for monitoring purposes.

Block: The FortiGate unit blocks the traffic and logs it as an attack.

The priority of the network protocol override determines the order in which the FortiGate unit applies the security action to the traffic. The lower the priority number, the higher the priority. For example, a priority of 1 is higher than a priority of 10.

In the exhibit, the application sensor has the following settings:

The industrial category has a security action of allow, which means that the FortiGate unit will not inspect or log any traffic that belongs to this category.

The IEC.60870.5.104 Information.Transfer network protocol override has a security action of block, which means that the FortiGate unit will block and log any traffic that matches this protocol.

The IEC.60870.5.104 Control.Functions network protocol override has a security action of monitor, which means that the FortiGate unit will allow and log any traffic that matches this protocol.

The IEC.60870.5.104 Start/Stop network protocol override has a security action of allow, which means that the FortiGate unit will not inspect or log any traffic that matches this protocol.

The IEC.60870.5.104 Transfer.C.BO.NA.1 network protocol override has a security action of block, which means that the FortiGate unit will block and log any traffic that matches this protocol.

The problem with these settings is that the IEC.60870.5.104 Transfer.C.BO.NA.1 network protocol override has a lower priority than the IEC.60870.5.104 Information.Transfer network protocol override. This means that if the traffic matches both protocols, the FortiGate unit will apply the security action of the higher priority override, which is block. However, the IEC.60870.5.104 Transfer.C.BO.NA.1 protocol is used to transfer binary outputs, which are essential for controlling OT devices. Therefore, blocking this protocol could have negative consequences for the OT network.

To fix this issue, the OT network administrator must set the priority of the IEC.60870.5.104 Transfer.C.BO.NA.1 network protocol override to 1, which is higher than the priority of the IEC.60870.5.104 Information.Transfer network protocol override. This way, the FortiGate unit will apply the security action of the lower priority override, which is allow, to the traffic that matches both protocols. This will ensure that the FortiGate unit does not block the traffic that is used to transfer binary outputs, while still blocking the traffic that is used to transfer information.

1:NSE 7 Network Security Architect - Fortinet

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asked 18/09/2024
John Hart
47 questions
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