Linux Foundation BCP Certification Exam Sample Questions

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Linux Foundation BCP Sample Questions:

01. How does an externally owned account's nonce help prevent the same transaction from being processed twice?
a) The nonce stores the account's balance, which drops to zero after one use
b) The nonce encrypts the transaction so it cannot be copied
c) Each transaction must carry the next sequential nonce, so a given transaction is valid only once
d) The nonce is a random value that nodes compare against a blocklist
 
02. Prometheus cannot scrape a Besu node even though metrics are enabled, because a firewall blocks the default metrics port. Which port must be opened?
a) 9545
b) 8545
c) 8546
d) 30303
 
03. An operator needs a running Besu node to connect immediately to one specific peer whose enode URL they already have, without waiting for discovery. Which approach does this?
a) Add the peer's account address to the account allowlist
b) Restart the node with a larger transaction pool
c) Lower the node's --min-gas-price to zero
d) Call the admin_addPeer JSON-RPC method with the peer's enode URL
 
04. Operators of a private Besu network need to stop one specific account from submitting transactions while leaving its node connected. Which mechanism does this?
a) Account permissioning
b) Lowering the block gas limit
c) Changing the sync mode to full
d) Node permissioning
 
05. Which statement correctly compares proof of authority (PoA) with proof of work (PoW) and proof of stake (PoS)?
a) PoA, PoW and PoS all choose block producers at random from all accounts
b) PoA validators neither mine nor stake
c) PoA validators compete by expending computing power, as in PoW
d) PoA validators must lock up native currency as stake, as in PoS
 
06. In current Besu documentation, what is the correct term for the list of nodes or accounts that are permitted on a permissioned network?
a) A whitelist
b) A blocklist
c) A denylist
d) An allowlist
 
07. A new node on a private Besu network starts up but never finds any peers. The operator started it without --bootnodes. What should they do?
a) Give the node a different chain ID in its genesis configuration so that it stands out and is noticed by existing peers
b) Set --bootnodes to existing nodes' enode URLs
c) Set --min-gas-price=0 so peers will accept its connection
d) Enable metrics so the node advertises itself to peers
 
08. Why does block time tend to increase as more validators are added to a QBFT network?
a) Adding validators lowers the block gas limit automatically
b) Each additional validator stores its own separate full copy of the entire chain, and the extra disk writes are what slow block production
c) More validators need more commit messages
d) More validators raise the gas price, which delays transactions
 
09. A tutorial tells you to enable Besu's built-in Tessera private transactions. On a current Besu release, how should you treat that advice?
a) Tessera is Besu's current onchain permissioning engine
b) Tessera private transactions were removed
c) Tessera is required before any transaction can be sent
d) Tessera-based private transactions are enabled by default in current Besu and require no additional configuration to begin using
 
10. Besu's layered transaction pool keeps its highest-value, next-block-ready transactions in the first layer. What do its other layers hold?
a) A backlog of lower-value or not-yet-executable transactions
b) Transactions that have already been included in blocks
c) A copy of the world state for fast lookups
d) Only transactions from validator nodes

Answers:

Question: 01
Answer: c		 Question: 02
Answer: a		 Question: 03
Answer: d		 Question: 04
Answer: a		 Question: 05
Answer: b
Question: 06
Answer: d		 Question: 07
Answer: b		 Question: 08
Answer: c		 Question: 09
Answer: b		 Question: 10
Answer: a

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