1. Which of the following statements about the 51-percent attack is INCORRECT: A. 51-percent attack cannot steal coins from an existing address.  B. 51-percent attack cannot suppress some transactions (e.g., by refusing the services to certain users).  C. 51-percent attack cannot change the block reward. D. 51-percent attack cannot impact the confidence in Bitcoin.

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Network Security

The word "network security" refers to a wide range of technology, devices, and processes. In its most basic form, it is a combination of rules and configurations that use both hardware and software technologies to safeguard the confidentiality, integrity, and accessibility of computer networks and data. Every company, regardless of sector, size or infrastructure, needs network security solutions to protect itself from the ever-increasing landscape of cyber threats that exist today.