ICS Security Network Architecture and Protocols

Question 1

What is the purpose of a demilitarized zone (DMZ) in an ICS network?

Accepted Answer

Isolates ICS from external networks

Answer

Hosts backup files

Answer

Connects directly to PLCs

Answer

Enables wireless communication

Question 2

Which protocol is commonly used for communication in SCADA systems?

Accepted Answer

Modbus

Answer

SMTP

Answer

FTP

Answer

SNMP

Question 3

What is the main function of a programmable logic controller (PLC)?

Accepted Answer

Control industrial machinery

Answer

Send email alerts

Answer

Host web applications

Answer

Manage databases

Question 4

What is a common vulnerability of legacy ICS protocols?

Accepted Answer

Lack of security features

Answer

Excessive logging

Answer

Strong password enforcement

Answer

Overhead from TLS encryption

Question 5

Which layer of the OSI model does the TCP protocol operate on?

Accepted Answer

Transport

Answer

Application

Answer

Network

Answer

Session

Question 6

Why is network segmentation important in ICS environments?

Accepted Answer

Limits exposure of critical assets

Answer

Improves wireless signal

Answer

Reduces latency

Answer

Enables direct internet access