BTA CBSA Certification Sample Questions

01. Which of the following enterprise blockchain platforms does not have smart contract functionality?
a) Ethereum
b) Quorum
c) R3 Corda
d) Hyperledger Fabric
e) Ripple

02. A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that requires ________. What is required?
a) Consensus
b) Crypthography
c) Bandwidth
d) Availability

03. How are blocks of data "chained" together to ensure the integrity of transactions?
a) The hash of the genesis block is kept in all block headers
b) The hash of the previous block is written to the header of the current block
c) A public key is stored in each block for data decryption
d) The ID of the previous block is stored in the current block

04. In common blockchain design, what is one common method to “chain” blocks of data together in order?
a) Store the hash of the previous block within the current block
b) Having the genesis node store an ordered, mutable array of block hashes
c) Writing each block into a separate file on the hard disk of the node
d) Assigning an order number to each block so they can be sorted when requested

05. When a blockchain software is updated with new functionality that breaks or modifies the rules of the previous version of the software, what has just occurred?
a) A software fault
b) Revision Reversal Attack
c) A hard fork
d) Autonomous update consensus

06. By default, who can see transaction details on a public/open blockchain?
a) The initiator
b) Everyone
c) The recipient of a transaction
d) The network owner / administrator

07. What are some advantages of Proof of Stake (POS) mining over Proof of Work (POW) mining?
(Select three.)
a) Energy efficient in regards to that it could consume for electricity as compared to PoW
b) Faster Hashing algorithms
c) No need for expensive compared to POW
d) Faster validations compared to POW
e) Better blockchain security compared to POW

08. Every node needs to keep track of time AND it needs to be in synch with its other peer nodes on the blockchain. In Bitcoin for example the current median for time is around?
a) 7 minutes
b) 7 seconds
c) 17 seconds
d) 70 Minutes
e) 70 Seconds

09. Proof of Stake based blockchain systems use what design to permit valid write transactions?
a) A genesis "Stake" node approves or disapproves transactions announced from other nodes
b) Validator nodes each give or pay a stake in order to write transactions, and if malicious, will lose their stake
c) Stakeholders or early product investors host nodes that approve or disapprove transactions from other nodes
d) Every node on the network holds an equal stake, and if malicious, gets flagged for removal

10. Geth uses what port to expose the Ethereum RPC Service?
a) 8545
b) 2096
c) 4096
d) 2545