Self-Study 41. (J277) 1.5 Utility system software

What is the purpose of encryption in computer networks?

• To increase the speed of data transmission

• To scramble plain text into cipher text

• To reduce the size of data files

• To organise files on a hard disk

What is required to decrypt cipher text back into readable text?

• A password

• A key encryption

• A defragmentation utility

• A network protocol

Which of the following is an example of a simplistic encryption technique?

• RSA encryption

• Caesar cipher

• AES encryption

• Quantum encryption

What is the main function of defragmentation utilities?

• To encrypt files

• To reorganise files on a hard disk

• To increase the size of files

• To delete unnecessary files

Why should solid-state drives not be defragmented?

• They have moving parts

• They can access files very quickly without defragmentation

• They are too expensive to defragment

• They do not store data in fragments

What is the result of defragmenting a hard disk?

• Increased file size

• Faster access to files

• Decreased storage capacity

• Improved encryption

What is the term used for the scrambled version of plain text in encryption?

• Encrypted text

• Cipher text

• Fragmented text

• Plain text

Which of the following is NOT a characteristic of encryption?

• It uses algorithms

• It makes data unreadable without a key

• It speeds up file access

• It can be part of an operating system

What is the primary benefit of using encryption in computer networks?

• To reduce data size

• To protect data from unauthorized access

• To increase network speed

• To organise data

How does defragmentation affect the read-write head of a hard disk?

• It increases its movement

• It reduces its movement

• It has no effect

• It removes the read-write head