A network engineer is troubleshooting a connectivity issue between two SCADA devices. The devices are on different subnets and communicate through a router. The engineer suspects a problem at the transport layer. Which action would best confirm a transport-layer issue?

Check if the TCP handshake completes between the two devices.

Check the routing table on the router.

Ping the remote device's IP address.

Verify the MAC address of the remote device.

A new OT device is configured to use DHCP, but it fails to obtain an IP address. The DHCP server is on a different subnet, and the router between the subnets is not configured to forward DHCP broadcasts. Which solution would allow the device to obtain an IP address?

Assign a static IP address to the device that is in the same subnet as the DHCP server.

Use DNS to resolve the DHCP server's hostname and then send a unicast DHCP request.

Configure a DHCP relay agent on the router to forward DHCP requests to the DHCP server.

Enable NAT on the router to translate the DHCP broadcast to the DHCP server's subnet.

Which of the following is a feature of TCP that is not provided by UDP?

Flow control and congestion control

Multiplexing using port numbers

An engineer needs to remotely manage a network switch on the ICS network. The switch supports both Telnet and SSH. Security policy requires encrypted management sessions. Which protocol should the engineer use and why?

Telnet, because it is simpler and has lower overhead.

Telnet, because it uses port 23, which is less likely to be blocked.

SSH, because it uses UDP, which is faster for management.

SSH, because it encrypts all traffic, including credentials and commands.

EC-CouncilICS/SCADA Cybersecurity

Domain 2Objective 1

Introducing TCP/IP Networks ICSSCADA Practice Questions (Page 6)

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 26–30

26foundation · easy
What is the default subnet mask for a Class C IPv4 address?
Select an answer first
27expert · hard
A network engineer is troubleshooting a connectivity issue between two SCADA devices. The devices are on different subnets and communicate through a router. The engineer suspects a problem at the transport layer. Which action would best confirm a transport-layer issue?
Select an answer first
28expert · hard
A new OT device is configured to use DHCP, but it fails to obtain an IP address. The DHCP server is on a different subnet, and the router between the subnets is not configured to forward DHCP broadcasts. Which solution would allow the device to obtain an IP address?
Select an answer first
29foundation · easy
Which of the following is a feature of TCP that is not provided by UDP?
Select an answer first
30application · medium
An engineer needs to remotely manage a network switch on the ICS network. The switch supports both Telnet and SSH. Security policy requires encrypted management sessions. Which protocol should the engineer use and why?
Select an answer first

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