A SCADA system uses a proprietary protocol that sends small, time-critical control messages. The protocol does not require acknowledgment, and messages must be delivered with minimal delay. The network also carries file transfers that require reliable delivery. Which transport protocol should be used for the control messages?

UDP, because it provides low overhead and no acknowledgment delay, which is suitable for time-critical messages.

ARP, because it resolves addresses quickly.

TCP, because it guarantees delivery and ordering, which is essential for control messages.

ICMP, because it is designed for control messages.

Which of the following is a characteristic of UDP?

It establishes a connection before sending data.

It provides reliable, ordered delivery of data.

It has lower overhead than TCP.

What is the purpose of port numbers in TCP/IP communication?

To encrypt data during transmission

To identify the specific application or service on a host

To determine the physical path for data transmission

To identify the network interface card

A manufacturing plant's SCADA network uses a DNS server for internal hostname resolution. An engineer reports that 'plc-line3' resolves to an incorrect IP address. You verify that the DNS server has the correct A record. Which action is most likely to resolve the issue?

Change the workstation's DNS server to a public DNS server.

Reboot the PLC to force it to re-register its IP address.

Add a static route on the workstation to the PLC's subnet.

Clear the DNS cache on the engineer's workstation.

Which of the following is a key difference between the TCP/IP and OSI models?

The TCP/IP model has a dedicated presentation layer, while the OSI model does not.

The TCP/IP model has seven layers, while the OSI model has four.

The OSI model has a dedicated session layer, while the TCP/IP model does not.

The OSI model is based on the internet protocols, while the TCP/IP model is purely theoretical.

EC-CouncilICS/SCADA Cybersecurity

Domain 2Objective 1

Introducing TCP/IP Networks ICSSCADA Practice Questions (Page 5)

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 21–25

21expert · medium
A SCADA system uses a proprietary protocol that sends small, time-critical control messages. The protocol does not require acknowledgment, and messages must be delivered with minimal delay. The network also carries file transfers that require reliable delivery. Which transport protocol should be used for the control messages?
Select an answer first
22foundation · easy
Which of the following is a characteristic of UDP?
Select an answer first
23foundation · easy
What is the purpose of port numbers in TCP/IP communication?
Select an answer first
24application · medium
A manufacturing plant's SCADA network uses a DNS server for internal hostname resolution. An engineer reports that 'plc-line3' resolves to an incorrect IP address. You verify that the DNS server has the correct A record. Which action is most likely to resolve the issue?
Select an answer first
25foundation · easy
Which of the following is a key difference between the TCP/IP and OSI models?
Select an answer first

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