ICS/SCADA Protocols ICSSCADA Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A pharmaceutical company needs to integrate real-time process data from multiple PLCs into a centralized historian for batch reporting. The PLCs are from different vendors and support different protocols. The IT department wants to use a standard, platform-independent interface. Which technology is best suited for this integration?

   • AEtherNet/IP
   • BDNP3
   • CModbus TCP
   • DOPC UA
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   During a security assessment, an analyst notices that a DNP3 master is accepting unsolicited responses from an outstation that is not in its configured device list. The analyst also sees that the outstation is sending data with a source address that matches a known device but the link-layer address is different. What is the most likely issue?

   • AThe outstation is broadcasting its data to all masters on the network.
   • BThe outstation is using a dynamic IP address that changed.
   • CThe master is configured in peer-to-peer mode, which allows any device to communicate.
   • DThe DNP3 implementation is not validating source addresses, allowing spoofing.
   Reveal Solution Discussion Select an answer first
4. 23expert · hard

   A manufacturing company has a legacy serial Modbus network controlling a critical process. They want to add remote monitoring capabilities from a central office over a WAN. The WAN link is a 256 kbps leased line. The process requires that the remote monitoring system receive updates at least every 5 seconds. Which approach is most appropriate?

   • AInstall a local data concentrator that polls the serial devices and sends only changed data to the central office using DNP3 report-by-exception.
   • BInstall a serial-to-Ethernet gateway at the plant and use Modbus TCP over the WAN to poll the devices from the central office.
   • CUse a VPN tunnel over the WAN and run Modbus TCP directly from the central office.
   • DReplace the serial Modbus network with an Ethernet-based OPC UA system.
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A manufacturing plant uses a peer-to-peer ICS protocol where each PLC can initiate communication with any other PLC on the same network segment. The control engineer wants to add a new PLC that must only communicate with the existing PLCs for data exchange, not with the SCADA historian. Which protocol characteristic is most relevant to this requirement?

   • AMaster/slave polling model
   • BReal-time deterministic scheduling
   • CSerial transmission mode
   • DPeer-to-peer communication model
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   Which of the following is a key difference between typical IT protocols and ICS/SCADA protocols?

   • AICS/SCADA protocols always use serial communication, while IT protocols always use Ethernet
   • BIT protocols usually prioritize confidentiality, while ICS/SCADA protocols often prioritize availability and real-time response
   • CICS/SCADA protocols are designed for high-bandwidth data streaming, unlike IT protocols
   • DIT protocols are proprietary, while ICS/SCADA protocols are all open standards
   Reveal Solution Discussion Select an answer first