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Blockchain CBDE Exam - Topic 4 Question 117 Discussion

Actual exam question for Blockchain's CBDE exam

Question #: 117
Topic #: 4

[All CBDE Questions]

To communicate with an Ethereum node via JavaScript:

Athe library you use must make use of the JSON-RPC Interface of an Ethereum Node.

Bmust Implement the Ethereum Protocol to connect to other Ethereum Nodes.

Cmust use Web3.js, which is closed source to communicate to other Ethereum Nodes.

Show Suggested Answer

Suggested Answer: A

by Elza at Aug 17, 2025, 10:32 PM

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Doug

5 months ago

Wait, Web3.js is closed source? That's surprising!

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Elke

6 months ago

B seems off, you don't need to implement the whole protocol.

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Ben

6 months ago

A is correct, JSON-RPC is essential for communication.

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Ashlee

6 months ago

Totally agree, you need that interface!

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Felicidad

6 months ago

A all the way, it's the standard way to connect!

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Billi

7 months ago

I’m a bit confused about C; I thought Web3.js was open source, so that makes me doubt that option.

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Hillary

7 months ago

I recall practicing a question similar to this, and I think A was the right choice there too, focusing on JSON-RPC.

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Weldon

7 months ago

I'm not entirely sure, but I feel like B might be correct since it mentions the Ethereum Protocol, which seems important for node connections.

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Alishia

7 months ago

I think the answer is A because I remember studying how JSON-RPC is essential for communication with Ethereum nodes.

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Marguerita

7 months ago

This is a good question that tests our understanding of Ethereum development. I think the key is recognizing that the JSON-RPC interface is the standard way to interact with Ethereum nodes from JavaScript applications. Option A seems like the correct answer here.

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Alyce

8 months ago

I'm not too sure about this question. The options seem a bit technical, and I'm not super familiar with the details of Ethereum node communication. I'll have to review my notes and try to reason through the best approach.

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Verda

8 months ago

Okay, I've got this. The correct answer is A - the library you use must make use of the JSON-RPC interface of an Ethereum node. That's the standard way to communicate with Ethereum nodes from JavaScript. I feel confident about this one.

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Junita

8 months ago

Hmm, I'm a bit confused about the different options here. I know we need to use some kind of library to interact with Ethereum nodes, but I'm not sure if the Ethereum protocol or Web3.js are required. I'll have to think this through carefully.

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Alesia

8 months ago

This looks like a straightforward question about communicating with Ethereum nodes. I think the key is understanding the JSON-RPC interface, so I'll focus on that.

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Edna

10 months ago

I'm pretty sure it's A. Why would we need to implement the whole Ethereum protocol just to talk to a node? Seems like overkill.

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Avery

9 months ago

I agree, implementing the whole Ethereum protocol does seem like overkill.

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Mabel

9 months ago

A) the library you use must make use of the JSON-RPC Interface of an Ethereum Node.

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Noel

10 months ago

I agree with Brent, using JSON-RPC Interface is essential for communication with an Ethereum node.

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Zona

10 months ago

The correct answer is definitely A. Using the JSON-RPC interface is the standard way to communicate with an Ethereum node from JavaScript.

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Brent

10 months ago

I think the answer is A) the library you use must make use of the JSON-RPC Interface of an Ethereum Node.

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