A technician pings a remote RTU from the control center and receives 'Reply from 10.0.0.1: Destination host unreachable.' The RTU is on a different subnet. Which conclusion is most likely correct?

The RTU's firewall is blocking ICMP echo requests.

The router at 10.0.0.1 has no route to the RTU's subnet.

The RTU is powered off and not responding to ARP requests.

The control center's default gateway is misconfigured.

A SCADA system uses a UDP-based protocol for real-time sensor data. The data is time-sensitive, and occasional packet loss is acceptable. Which characteristic of UDP makes it suitable for this application?

UDP has low overhead and does not guarantee delivery, reducing latency.

UDP provides reliable delivery with retransmission of lost packets.

UDP uses a three-way handshake to establish a connection.

UDP guarantees packet ordering, which is essential for sensor data.

EC-CouncilICS/SCADA Cybersecurity

Domain 2Objective 1

Introducing TCP/IP Networks ICSSCADA Practice Questions (Page 8)

Part of the TCP/IP and ICS/SCADA Protocols domain, which makes up ~13% of our current practice bank. EC-Council does not publish an official question count, but from its 120-minute exam (~50–80 total, ~7–10 in this domain), expect 1–2 from this objective — we provide 43 practice questions to prepare you well beyond it. (estimate)

43questions here

9free pages

10concepts

Questions 36–40

36application · easy
A workstation on the same subnet as a PLC sends an IP packet to the PLC. The workstation knows the PLC's IP address but not its MAC address. Which protocol does the workstation use to determine the PLC's MAC address?
Select an answer first
37application · medium
A new PLC is added to a SCADA network. The network uses DHCP. The PLC receives an IP address, subnet mask, and default gateway. Which additional DHCP option is essential for the PLC to resolve hostnames of other devices?
Select an answer first
38foundation · easy
Which layer of the TCP/IP model is responsible for routing packets across different networks?
Select an answer first
39application · medium
A technician pings a remote RTU from the control center and receives 'Reply from 10.0.0.1: Destination host unreachable.' The RTU is on a different subnet. Which conclusion is most likely correct?
Select an answer first
40application · medium
A SCADA system uses a UDP-based protocol for real-time sensor data. The data is time-sensitive, and occasional packet loss is acceptable. Which characteristic of UDP makes it suitable for this application?
Select an answer first

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Introducing TCP/IP Networks ICSSCADA Practice Questions (Page 8)

Questions 36–40

A workstation on the same subnet as a PLC sends an IP packet to the PLC. The workstation knows the PLC's IP address but not its MAC address. Which protocol does the workstation use to determine the PLC's MAC address?

A new PLC is added to a SCADA network. The network uses DHCP. The PLC receives an IP address, subnet mask, and default gateway. Which additional DHCP option is essential for the PLC to resolve hostnames of other devices?

Which layer of the TCP/IP model is responsible for routing packets across different networks?

A technician pings a remote RTU from the control center and receives 'Reply from 10.0.0.1: Destination host unreachable.' The RTU is on a different subnet. Which conclusion is most likely correct?

A SCADA system uses a UDP-based protocol for real-time sensor data. The data is time-sensitive, and occasional packet loss is acceptable. Which characteristic of UDP makes it suitable for this application?

Keep studying — TCP/IP and ICS/SCADA Protocols