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Question 350 - CAS-004 discussion

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A security consultant has been asked to recommend a secure network design that would:

• Permit an existing OPC server to communicate with a new Modbus server that is controlling electrical relays.

• Limit operational disruptions.

Due to the limitations within the Modbus protocol, which of the following configurations should the security engineer recommend as part of the solution?

A.
Restrict inbound traffic so that only the OPC server is permitted to reach the Modbus server on port 135.
Answers
A.
Restrict inbound traffic so that only the OPC server is permitted to reach the Modbus server on port 135.
B.
Restrict outbound traffic so that only the OPC server is permitted to reach the Modbus server on port 102.
Answers
B.
Restrict outbound traffic so that only the OPC server is permitted to reach the Modbus server on port 102.
C.
Restrict outbound traffic so that only the OPC server is permitted to reach the Modbus server on port 5000.
Answers
C.
Restrict outbound traffic so that only the OPC server is permitted to reach the Modbus server on port 5000.
D.
Restrict inbound traffic so that only the OPC server is permitted to reach the Modbus server on port 502.
Answers
D.
Restrict inbound traffic so that only the OPC server is permitted to reach the Modbus server on port 502.
Suggested answer: D

Explanation:

OPC (Open Platform Communications) and Modbus are two common protocols used for industrial control systems (ICS). OPC is a standard that allows different devices and applications to exchange

data in a vendor-neutral way. Modbus is a serial communication protocol that enables devices to send and receive commands and data over a network. Modbus has two variants: Modbus TCP/IP,

which uses TCP port 502 for communication, and Modbus RTU/ASCII, which uses serial ports.

To allow an OPC server to communicate with a Modbus server that is controlling electrical relays, the security engineer should recommend restricting inbound traffic so that only the OPC server is

permitted to reach the Modbus server on port 502. This configuration would:

Permit the OPC server to send commands and data to the Modbus server using Modbus TCP/IP protocol over port 502.

Limit operational disruptions, by preventing unauthorized or malicious access to the Modbus server from other sources.

Due to the limitations within the Modbus protocol, such as lack of encryption and authentication, restricting inbound traffic is a necessary security measure to protect the integrity and availability of

the ICS.

Reference: CASP+ (Plus) Certification Training | CompTIA IT Certifications

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asked 02/10/2024
Dustin Sickle
31 questions
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