Free CBSA Exam Braindumps (page: 2)

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A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that requires ____________. What is required?

  1. Consensus
  2. Crypthography
  3. Bandwidth
  4. Availability

Answer(s): A

Explanation:

A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that require consensus.


Reference:

https://en.wikipedia.org/wiki/Byzantine_fault_tolerance



A ____________cipher basically means it is using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.

What is the cipher type?

  1. Stream
  2. Block
  3. Parallel
  4. RSA

Answer(s): A

Explanation:

Stream cipher basically means using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.


Reference:

https://blockgeeks.com/guides/cryptocurrencies-cryptography/



You currently using the Metamask Chrome plugin and you see a selection for Etherescan in the plugin. What is Etherscan used for?

  1. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Ethereum Blockchain
  2. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Bitcoin Blockchain
  3. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Ethereum and Tokens Blockchain
  4. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on any Blockchain

Answer(s): A

Explanation:

A search engine that allows users to easily lookup, confirm and validate transactions that have taken place on the Ethereum Blockchain


Reference:

https://etherscancom.freshdesk.com/support/solutions/articles/35000022140-what-is-etherscan-



What are two challenges with using a Proof of Work algorithm? (Select two.)

  1. Mining pools not allowed
  2. Difficulty rate goes done every year.
  3. Expensive
  4. Power Intensive

Answer(s): C,D


Reference:

http://www.hl.co.uk/news/2018/2/16/a-brief-history-of-blockchain-technology-everyone-should-read



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