CNS D15C- 22 August

Which of the following is the primary goal of computer security?

• Enhancing user experience

• Protecting assets from unauthorized access, use, disclosure, disruption, modification, or destruction

• Improving network speed

• Reducing hardware costs

What does the "C" in CIA triad stand for?

• Confidentiality

• Cryptography

• Cybernetics

• Classification

Which security service ensures that data is not altered in transit?

• Confidentiality

• Integrity

• Availability

• Non-repudiation

A denial-of-service (DoS) attack primarily targets which aspect of the CIA triad?

• Confidentiality

• Integrity

• Availability

• Non-repudiation

The Vigenère cipher is an example of a:

• Mono-alphabetic substitution cipher

• Poly-alphabetic substitution cipher

• Transposition cipher

• Stream cipher

What is the main principle behind a mono-alphabetic substitution cipher?

• Shifting each letter of the plaintext by a fixed number of positions

• Using a different substitution alphabet for each letter of the plaintext

• Rearranging the order of the plaintext letters

• Hiding a message within another message or file

Steganography is the art and science of:

• Securing communication by converting data into an unreadable format

• Hiding the existence of a message

• Preventing unauthorized access to a network

• Detecting and preventing malware

Which security mechanism is used to verify the identity of a user or system?

• Access Control

• Data Integrity

• Authentication

• Traffic Padding

In a network security model, the term "security policy" defines:

• The specific cryptographic algorithms used

• The set of rules and practices that specify how an organization protects its assets

• The hardware devices used for security

• The frequency of security audits

A message "GEMINI" is encrypted using a Caesar cipher with a key of 3. What is the ciphertext?

• JEMINI

• JHPLQL

• FDLJLH

• EHPHKL