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SCADA System and PLC Communication

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Questions and Answers

What is the main function of a PLC (Programmable Logic Controller) in a SCADA system?

To provide low latency and determinism
To monitor and control industrial processes (correct)
To communicate using protocols such as EtherNet/IP, Modbus, Profibus
To transfer data from one device to another

What is the purpose of data communication in the context of automation and SCADA systems?

To classify the components of a SCADA system
To provide low latency and determinism
To transfer data from one device to another via some form of transmission medium (correct)
To connect devices to the Internet

What are the components involved in data flow between two devices in a SCADA system?

MAC layer, hosts, routers
Message, sender, receiver, medium, and protocol (correct)
PLC, Modbus, Ethernet/IP
Simplex, half-duplex, full-duplex

What is the term used to describe a set of communication devices connected by media links?

Network (A) Signup and view all the answers

In the context of automation and SCADA systems, what are hosts?

Devices connected to the Internet (D) Signup and view all the answers

How does data flow between two devices occur in full-duplex mode in a SCADA system?

Data flows in both directions simultaneously (D) Signup and view all the answers

What is the function of the User Datagram Protocol (UDP)?

Does not guarantee delivery of packets or correct order (D) Signup and view all the answers

What is the purpose of the Dynamic Host Configuration Protocol (DHCP)?

Obtains IP address dynamically from a server (A) Signup and view all the answers

What does an IP address uniquely identify on the Internet?

Host and router interface (D) Signup and view all the answers

What is the purpose of the 32-bit identifier in an IP address?

Identify unique network and host addresses (D) Signup and view all the answers

What is the purpose of IPv6?

Uses 128 bit addresses for efficient allocation (D) Signup and view all the answers

What is a characteristic of Transmission Control Protocol (TCP)?

Supports port number and guarantees delivery of packets (D) Signup and view all the answers

What does the acronym ISP stand for in networking?

Internet Service Provider (B) Signup and view all the answers

What is the role of a Tier-1 ISP in Internet routing?

Tier-1 ISP provides global Internet transit service without purchasing access from other providers (A) Signup and view all the answers

How does a host obtain its IP address using DHCP?

DHCP dynamically assigns an IP address to the host from a server when it joins the network (C) Signup and view all the answers

What is the primary function of UDP and TCP in networking?

TCP guarantees ordering while UDP ensures packet delivery (B) Signup and view all the answers

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