Chapter 8

Question 1

What is network security

Answer 1

Security is of paramount importance to any network as the loss of data, in particular,
personal or confidential data can have many serious consequences. Risks to data become
greater as it is shared across a network

Question 2

Purpose of a password

Answer 2

Passwords are commonly used to prove a person’s
identity to a computer system, thus allowing them
access to relevant data

Question 3

What is Encryption

Answer 3

Encryption is the conversion of data, using an algorithm, into a form, called cyphertext that
cannot be easily understood by people without the decryption key.

Question 4

What is compression

Answer 4

It is the process of making a file smaller

Question 5

What is the formula for compression ratio

Answer 5

Original file size / compressed file size

Question 6

What is Lossy compression

Answer 6

Lossy compression is a technique that compresses the file size by discarding some of the data. The technique aims to reduce the amount of data that needs to be stored