Ethical Hacking | NPTEL | Week 8 Assignment Solutions

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Ethical Hacking week 8 Solutions

Q1. Consider the following statements:
(i) Steganography refers to a set of methods to hide some secrete information in an audio/image/exectable files.
(ii) Steganography and digital watermarking shares same operational and functional behaviors.

a) Only (i) is true
b) Only (ii) is true
c) Both (i) and (ii) are true
d) Both (i) and (ii) are false

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Q2. Consider a gray-level image of size 2000 x 2000, where each pixel is stored in 24-bits (cotaining red, green, and blue components as 8-bit each. How many bytes of information can be hidden in the image by suing LSB steganography technique? (Assume that only the least significant bit in each 8-bit color component is modified).

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Ethical Hacking week 8 Solutions

Q3. Which of the following statement(s) is/are true?

a) Biometrics refers to an automated method for hiding information in a media like audio, video, image etc.
b) Biometrics refers to embedding copyright, ownership, license and similar information in a medium such as audio, video, image etc.
c) Biometrics refers to an automated method for recognizing individuals based on measurable biological and behavioral characteristics.
d) None of these

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Q4. Which of the following is/are example(s) of behaviour biometric?

a) Retina scan
b) Fingerprint recognition
c) Facial recognition
d) None of these

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Q5. Which of the following statement(s) is/are true in biometric systems?

a) For authentication application, a user template is compared against all possible templates stored in the database.
b) For verification application, a user template is compared against a specific single template stored in the database.
c) Biometric systems can provide 100% accuracy in security applications.
d) None of these

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Ethical Hacking week 8 Solutions

Q6. Which of the following attacks rely on the accumulation of TCP half-open connections on the server?

a) Ping of death attack
b) SYN flooding attack
c) Smurf attack
d) None of these

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Q7. In which of the following denial-of-service attacks, the attacker attempts to crash/freeze target computer/service by sending oversized packet in simple ping command?

a) SYN flooding attack
b) Smurf attack
c) Ping-of-death
d) None of these

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Ethical Hacking week 8 Solutions

Q8. Which of the following statement(s) is/are true for HTTP Flood attack?

a) It is a type of Distributed-Denial-of-Service (DDoS) attack.
b) It overwhelms a target server by accumulating large number of TCP half-open connections.
c) It overwhelms a target server using oversized ping packets.
d) It overwhelms a target server with HTTP request.
e) None of these

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Ethical Hacking week 8 Solutions

Q9. Which of the following approach can be used to mitigate HTTP flood attack?

a) Use captcha test
b) Use JavaScript computational challenge
c) Use web application firewall
d) Block ping requests
e) Block TCP connections
f) None of these

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Q10. Which of the following is true for recursive name resolution?

a) A host may have to send multiple DNS requests to several DNS servers.
b) A host sends a single DNS request to its next higher-level DNS server.
c) Name resolution happens recursively within the host itself.
d) All of these

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Ethical Hacking week 8 Solutions

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