A teammate explains that an industrial control system has a master controller poll a set of numbered holding registers on each factory-floor device over a simple serial or TCP link, reading and writing raw register values with a lightweight protocol designed decades ago for devices with almost no processing power to spare. What is being described?
The Modbus protocol is exactly what is described here. A DNS zone transfer is an unrelated concept about replicating name server records. Understanding Modbus is exactly why it comes up so often in real engineering discussions of this kind of problem.
2 / 5
During a design review, the team adopts Modbus, specifically to gain a concrete benefit. Which capability does this provide?
Modbus here provides integration with decades-old industrial hardware, since Modbus needs almost no processing power and speaks in simple numbered register reads and writes over serial or TCP. Requiring every legacy factory-floor device to be replaced with hardware capable of running a modern, schema-rich pub/sub protocol before it can be integrated is the alternative this avoids. This behavior is exactly why Modbus is favored in this kind of scenario.
3 / 5
In a code review, a dev notices a system relies on requiring every legacy factory-floor device to be replaced with hardware capable of running a modern, schema-rich pub/sub protocol before it can be integrated, instead of using Modbus. What does this represent?
This is a missed Modbus-opportunity, since Modbus would provide integration with decades-old industrial hardware, since Modbus needs almost no processing power and speaks in simple numbered register reads and writes over serial or TCP. A cache eviction policy is an unrelated concept about discarded cache entries. This pattern is exactly the kind of gap a reviewer flags once the tradeoffs are understood.
4 / 5
An incident report shows a factory automation project stalled because the plan assumed every legacy device would need replacing with modern pub/sub-capable hardware before any integration could begin. What practice would prevent this?
Polling the existing devices' holding registers over Modbus instead of replacing hardware that already speaks the simple, decades-old protocol. Continuing the prior approach regardless of the risk it has already caused is exactly what led to the incident described here. This fix is the standard remedy once the root cause is confirmed.
5 / 5
During a PR review, a teammate asks why the team reaches for Modbus instead of requiring every legacy factory-floor device to be replaced with hardware capable of running a modern, schema-rich pub/sub protocol before it can be integrated. What is the reasoning?
Modbus trades a rich schema and modern security model for compatibility with minimal, decades-old industrial hardware that has almost no spare processing power, while a modern pub/sub protocol offers a richer schema and better security but requires hardware capable of running a much heavier stack. This is exactly why Modbus is favored in scenarios that call for it, while the alternative remains acceptable in simpler cases that don't.
What does the "Modbus Vocabulary" vocabulary exercise cover?
This exercise tests real IT vocabulary related to modbus vocabulary through 5 multiple-choice questions, each built from realistic workplace sentences rather than abstract definitions.
Is this vocabulary exercise free to use?
Yes. Every exercise on CoderSlingo, including this one, is completely free — no account, sign-up, or payment required.
How many questions does this exercise have?
This exercise has 5 questions. Each one shows a real-world sentence or scenario with multiple-choice options and an explanation once you answer.
What happens after I answer a question?
You'll see immediate feedback showing whether your answer was correct, along with a short explanation of why — then a button to move to the next question, and a full results screen at the end.
Can I retry the exercise if I get questions wrong?
Yes. Once you reach the results screen, click "Try again" to reset your answers and go through the exercise from the start as many times as you like.
Do I need to create an account to take this exercise?
No account is needed. Your answers are scored in your browser during the session — nothing is saved to a server, so you can jump straight in.
Is my progress saved if I leave the page?
No — progress within an exercise resets if you navigate away or reload. Each exercise is short enough to complete in a few minutes in one sitting.
Are these vocabulary exercises connected to other topics?
Yes — browse the full vocabulary exercises hub to find related modules covering adjacent IT topics and roles.
How is this different from reading a glossary or blog article?
Exercises like this one are active recall drills — you have to choose the correct term or phrasing yourself, which builds retention faster than passively reading a definition.
Where can I find more vocabulary exercises?
Browse the full Vocabulary exercises hub for hundreds of modules covering Agile, DevOps, security, databases, architecture, and more — organised by IT role and skill.