Blockchain Developer Certification Practice 2026 - Free Blockchain Developer Practice Questions and Study Guide

The correct answer highlights Geth as a client implementation of Ethereum because it serves as one of the most popular and widely used Ethereum clients. Geth, or Go Ethereum, is written in the Go programming language and provides the capabilities to mine Ether, create smart contracts, and interact with the Ethereum blockchain directly. It is a full implementation of the Ethereum protocol that enables users to operate a node, helping to support the network and facilitating interactions with the blockchain.

In contrast, while MetaMask is a browser extension that allows users to interact with the Ethereum blockchain, it primarily functions as a wallet and a gateway to decentralized applications (dApps) without being a full client implementation itself. Mist used to be an official Ethereum wallet and browser, but it is no longer maintained and was not a standalone client implementation in the same sense as Geth. Paragon was a project that aimed to build a decentralized application platform but does not represent a client implementation of Ethereum.

This understanding reinforces the role of different implementations and tools within the Ethereum ecosystem and is vital for navigating blockchain technology effectively.