ICT Fundamentals 4

Question 1

What is the hexadecimal equivalent of the decimal number 255?

Accepted Answer

FF

Answer

Decimal 255 equals FF in hexadecimal, since F represents 15 and 15×16 + 15 = 255.

Question 2

Which layer of the OSI model is responsible for end-to-end communication and error recovery?

Accepted Answer

Transport layer

Answer

The Transport layer (Layer 4) of the OSI model handles end-to-end communication, error recovery, and data flow control.

Question 3

What distinguishes RAM from ROM?

Accepted Answer

RAM is volatile; ROM is non-volatile

Answer

RAM is volatile memory that loses its data when power is removed, while ROM is non-volatile and retains data without power.

Question 4

Which type of network topology connects all devices to a single central cable?

Accepted Answer

Bus topology

Answer

Bus topology connects all devices to a single backbone cable, with terminators at each end to prevent signal reflection.

Question 5

What is 'phishing' in the context of cybersecurity?

Accepted Answer

Tricking users into revealing sensitive information

Answer

Phishing is a social engineering attack that tricks users into revealing sensitive data like passwords through deceptive emails or websites.

ICT - Information Communication Technology Practice Test