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100+ Free Besu Certified Professional Practice Questions
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Which option enables JSON-RPC over WebSocket on a Besu node?
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2026 Statistics
Key Facts: Besu Certified Professional Exam
$250
Exam Fee (USD)
Linux Foundation
90 min
Exam Duration
Linux Foundation
7 domains
Blueprint Domains
Linux Foundation BCP outline
26%
Networking (heaviest domain)
Linux Foundation BCP outline
2 years
Certification Validity
Linux Foundation
2 attempts
Included within 12-month window
Linux Foundation
The Besu Certified Professional (BCP) is an online proctored, multiple-choice Linux Foundation exam on Hyperledger Besu, the Java Ethereum client. It runs 90 minutes, costs $250 USD (or $495 bundled), includes two attempts within a 12-month window, and is valid for 2 years; the Linux Foundation does not publish the passing score. The seven domains are Besu Core Concepts (24%), Networking (26%), Transactions and Storage (14%), Cryptography (10%), Permissioning and Privacy (10%), Execution Engine and Consensus (8%), and Monitoring (8%).
Sample Besu Certified Professional Practice Questions
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1What is Hyperledger Besu, as maintained under LF Decentralized Trust?
A.An open-source Ethereum client written in Java that can run on the public Ethereum network and on private permissioned networks
B.A consensus library that other Ethereum clients import to add proof-of-authority support
C.A managed cloud service that hosts Ethereum nodes and bills per transaction
D.A permissioned-only distributed ledger written in Go with its own non-EVM virtual machine
Explanation: Hyperledger Besu is an open-source Ethereum client developed under the Apache 2.0 license and written in Java. It is unique among the LF Decentralized Trust ledger projects because it is Ethereum-based and can run on the public Ethereum Mainnet, public testnets such as Sepolia, and private permissioned networks.
2Which license governs Hyperledger Besu and which programming language is it implemented in?
A.MIT license, implemented in Go
B.Apache 2.0 license, implemented in Java
C.BSD-3 license, implemented in C++
D.GPLv3 license, implemented in Rust
Explanation: Besu is released under the Apache 2.0 open-source license and is written in Java, which lets it run on the Java Virtual Machine across operating systems. This permissive license and JVM portability are key reasons enterprises adopt it for consortium deployments.
3An Ethereum client is the software that implements the Ethereum protocol. Which statement best describes Besu's role as a client?
A.It is a block explorer that reads other nodes' state but never participates in the network
B.It only validates blocks and cannot execute smart contracts
C.It implements the EVM, peer-to-peer networking, storage, and JSON-RPC APIs needed to run a node on EVM-based chains
D.It is a wallet that stores user funds but does not maintain blockchain state
Explanation: As an Ethereum client, Besu contains the components needed to participate in an EVM-based network: an EVM to execute transactions and smart contracts, peer-to-peer networking to communicate with other nodes, a storage layer for world state and blocks, and JSON-RPC APIs for external interaction. This modular separation of consensus, networking, storage, and EVM is a deliberate Besu design choice.
4Besu implements the Enterprise Ethereum Alliance (EEA) client specification. What is the primary purpose of aligning with the EEA specification?
A.To replace the public Ethereum protocol with a proprietary enterprise protocol
B.To mandate proof-of-work consensus for all enterprise networks
C.To require all transactions to be private by default
D.To create common, standard interfaces across Ethereum implementations so enterprises avoid vendor lock-in
Explanation: The EEA client specification was established to create common interfaces among open and closed source Ethereum projects so that users do not experience vendor lock-in and so application teams can rely on standard interfaces. Besu implements enterprise features in alignment with the EEA client specification, including its private transaction (EEA priv/eea JSON-RPC) interfaces.
5Why does Hyperledger Besu deliberately avoid managing user private keys inside the client?
A.For security reasons; instead an external signer such as Web3Signer (formerly EthSigner) handles key storage and transaction signing
B.Because Besu has no need to send signed transactions
C.Because private keys are stored on-chain in the genesis file
D.Because the JVM cannot perform cryptographic signing operations
Explanation: Besu does not support key management within the client due to security concerns. Instead, an external signing service such as Web3Signer (the successor to EthSigner) holds keys and signs transactions, often backed by HashiCorp Vault or cloud HSMs. This separation keeps private key material out of the client process.
6What does the genesis file define for a Besu network?
A.The list of peers a node should dial after startup
B.The first block in the chain and the network-wide settings, including the consensus protocol and initial account allocations
C.Only the metrics scrape interval used by Prometheus
D.The private keys for every validator on the network
Explanation: The genesis file defines the first block in the chain, and that first block defines which chain a node joins. It specifies network-wide settings such as the chain ID, the consensus protocol (ethash, ibft2, or qbft), gas configuration, and the initial account balances in the alloc section. All nodes in a network must use the same genesis file.
7In a Besu genesis file, what does the chainId in the config section establish?
A.The block period in seconds between consecutive blocks
B.The number of validators required to produce a block
C.A unique network identifier used for replay protection (EIP-155) so transactions signed for one chain cannot be replayed on another
D.The maximum number of peers a node may connect to
Explanation: The chainId is a unique identifier for the network and is incorporated into transaction signatures per EIP-155 replay protection, so a transaction signed for one chain ID cannot be replayed on a chain with a different ID. Each private Besu network should use its own distinct chain ID, separate from Mainnet (1) and public testnets.
8Which command-line option is used to start Besu with a custom private-network genesis file?
A.--data-path=<path>
B.--config-file=<path>
C.--network=mainnet
D.--genesis-file=<path>
Explanation: For a private network you create a JSON genesis file and point Besu at it with --genesis-file=<path>. For built-in public networks you instead use --network (for example --network=sepolia), where the genesis configuration is bundled into Besu.
9Besu can store its options in a configuration file. Which file format does Besu use for that configuration file?
A.TOML
B.INI
C.XML
D.YAML
Explanation: Besu uses the TOML format for its configuration file, supplied with --config-file. Storing flags in a TOML file makes a node's setup reusable and reproducible across restarts and across multiple nodes.
10What is a "free gas" (zero-base-fee) network in the context of a private Besu deployment?
A.A network where validators are paid a fixed block reward in stablecoins
B.A network configured so transactions cost no gas, typically by setting a zero base fee and a zero minimum gas price
C.A public network where the Ethereum Foundation subsidizes user gas
D.A network that disables the EVM to avoid computation costs
Explanation: Many private Besu networks run as free gas networks where transactions cost nothing, removing the need to fund accounts with ether. This is typically configured with a zero base fee in the genesis file (the zeroBaseFee or zerobasefee setting) together with starting Besu with --min-gas-price=0 so the node accepts zero-priced transactions.
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