Blockchain CBBF Practice Test - Questions Answers, Page 7
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How does Blockchain use hashing? Select all that apply.
A.
To condense information making it easy to compare large amounts of data.
B.
To chain together blocks
C.
To provide anonymity with public key cryptography
D.
To select which node to use
E.
All of the above
Blockchain does not provide?
A.
Security
B.
Immutability
C.
Fault tolerance
D.
Fact Transaction time
Which type of data can be stored on a Blockchain?
A.
A financial transaction
B.
A vote cast in an election
C.
A personal medical record
D.
Romeo and Juliet: The entire play
E.
All of the above
The cryptocurrency Bitcoin is__________.
A.
another application that runs on a Blockchain
B.
the same as all other cryptocurrencies
C.
replacing bartering in many parts of the world
D.
a replacement currency for the U.S. dollar
Which of the following problems did Blockchain solve for cryptocurrencies?
A.
Anonymity
B.
Double Spending
C.
Destination of currencies
D.
None of the above
One of Blockchain's primary uses of cryptography is___________.
A.
keeping the network configuration a secret
B.
providing a public and private encryption key
C.
allowing users to communicate with each other anonymously
D.
keeping the I.P. addresses a secret
What happens if a block is confirmed at the same time?
A.
The blocks splits into two chains. Blocks are then added to each chain until one chain becomes larger. The longest chain is then considered to be the Blockchain.
B.
Nodes select which block to be added to the Blockchain
C.
Both chains are deleted, and the unconfirmed transactions are added back to the pool
D.
The Orderer Block confirms which block has the most confirmed transactions
E.
None of the above
The height of a block is the______________ in the chain between it and the genesis block.
A.
metadata that is
B.
number of blocks
C.
Merkle tree hash
D.
size of the memory cache
Who can read records on a public Blockchain?
A.
Everyone on the Blockchain
B.
No one
C.
Only the creator
D.
The users with access permissions
E.
None of the above
Transactions per second (TPS) for a Proof-of-Work Blockchain are approximately?
A.
24K per second
B.
175K per second
C.
Only limited to the number of nodes on the network
D.
7-15 per second
E.
None of the above
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