Here you have the best Blockchain CBSA practice exam questions.
Some things you may want to keep in mind about this practice exam questions:
Question 1 of 45
SHA-1 is the most commonly used SHA algorithm, and produces a ______-byte hash value(size).
Correct Answer: D
SHA-1 produces a 20-byte (160-bit) hash value. Each byte contains 8 bits, and since SHA-1 generates a 160-bit hash, this equates to 20 bytes. It is well-known in cryptographic practices and standard documentation.
Question 2 of 45
How many satoshis are in 1 bitcoin and how many wei in an Ether? (Select two.)
Correct Answer: AC
There are 100,000,000 satoshis in 1 bitcoin, which corresponds to 1.0 × 10^8 satoshis. Therefore, 1 BTC does not convert to option A. However, 1 ether is equivalent to 1,000,000,000,000,000,000 wei, which is 1.0 × 10^18 wei. Thus, option A accurately reflects the conversion for ether. Meanwhile, the correct conversion for satoshis (bitcoin) should be chose option C. Therefore, the correct answers are option A and C.
Question 3 of 45
In the Proof of Stake(POS) algorithm the miners are really known as ___________?
Correct Answer: C
In the Proof of Stake (POS) algorithm, the individuals responsible for validating transactions and creating new blocks are typically known as 'forgers.' This term is used because, unlike Proof of Work systems where miners solve complex mathematical problems to create new blocks, in POS systems, the selection process is based on the amount of cryptocurrency held by the participant, known as their stake. The process is more about forging the new blocks based on the stakeholder's wealth rather than performing computationally intensive tasks.
Question 4 of 45
Which is the following is the metaphor that describes a logical dilemma that plagues many computer networks?
Correct Answer: B
The correct metaphor that describes a logical dilemma affecting computer networks is the Byzantine Generals' problem. This problem involves coordinating among multiple generals, or nodes, to agree on a unified strategy in the presence of some traitorous generals who may act maliciously or fail, causing communication issues. The problem highlights the challenges of reaching a consensus in distributed computing systems, particularly in the presence of faults or malicious actors.
Question 5 of 45
Secure Hash Algorithm (SHA-256) output is always 256 bits or 32 bytes in length regardless of the length of the input (even if input is millions of bytes). Select best answer.
Correct Answer: D
Secure Hash Algorithm 256 (SHA-256) always produces an output of 256 bits, or 32 bytes, irrespective of the length of the input data. This property is fundamental to how SHA-256 functions, making it a reliable algorithm for ensuring data integrity and security. Regardless of whether the input is a few bytes or millions of bytes, the hash value it generates will always be the fixed size of 256 bits.