Computer Networks CSE261 Lecture 9: Security and Privacy
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Questions and Answers

What is the function of a firewall in a network?

  • To monitor user activities on the network
  • To enhance network speed and performance
  • To provide secure data storage for the network
  • To control network security and access rules (correct)

Which type of firewall is typically used in companies as stand-alone devices?

  • Intrusion Detection System (IDS)
  • Software firewall
  • Unified Threat Management (UTM)
  • Hardware firewall (correct)

What is the purpose of a Virtual Private Network (VPN) in the context of network security?

  • To prevent unauthorized access to LAN resources
  • To establish secure connections over the Internet (correct)
  • To optimize network traffic for higher speed
  • To encrypt data stored on local servers

What is the function of Cryptography in the context of security systems?

<p>To secure communication by converting data into a secret code (C)</p> Signup and view all the answers

What is the main purpose of Steganography in network security?

<p>To conceal secret information within other non-secret data (C)</p> Signup and view all the answers

What is the main purpose of Steganography?

<p>To embed original secret messages inside a particular cover media (B)</p> Signup and view all the answers

What does VPN use to retain privacy while accessing outside resources?

<p>Encryption and security protocols (D)</p> Signup and view all the answers

What is the problem with Secret Key Cryptography (SKC)?

<p>The encrypted message is obvious and known that it is encrypted (D)</p> Signup and view all the answers

What is the technique used to separate a local area network (LAN) from untrusted networks and the internet?

<p>Demilitarized Zone (DMZ) (B)</p> Signup and view all the answers

What is steganalysis?

<p>A technique used to detect whether a media contains a hidden message or not (A)</p> Signup and view all the answers

What is the main function of a firewall in a network?

<p>To monitor and control network traffic based on predetermined security rules (A)</p> Signup and view all the answers

What is the main purpose of Cryptography in the context of security systems?

<p>To protect data by converting it into a secure format for transmission (B)</p> Signup and view all the answers

Which type of firewall is typically used in companies as stand-alone devices?

<p>Hardware firewall (A)</p> Signup and view all the answers

What is the most common use of Steganography in the context of security?

<p>To hide secret messages or information within other non-secret data (B)</p> Signup and view all the answers

What is the technique used to separate a local area network (LAN) from untrusted networks and the internet?

<p>Firewall (A)</p> Signup and view all the answers

What does a Virtual Private Network (VPN) use to retain privacy while accessing outside resources?

<p>Encrypted tunnels (B)</p> Signup and view all the answers

What is the main purpose of a Virtual Private Network (VPN) in the context of network security?

<p>To encrypt data/info and retain privacy while accessing outside resources (C)</p> Signup and view all the answers

What is the purpose of Steganography in network security?

<p>To transmit hidden message embedded in a cover medium that an unauthorized person cannot extract (B)</p> Signup and view all the answers

What is the function of Cryptography in the context of security systems?

<p>To encrypt data/info and retain privacy while accessing outside resources (D)</p> Signup and view all the answers

What is Secret Key Cryptography's (SKC) problem?

<p>The encrypted message is obvious and everyone knows that the message is encrypted (B)</p> Signup and view all the answers

What does Steganalysis refer to in the context of network security?

<p>A technique to detect the presence of a hidden message in a multimedia/cover to extract it (D)</p> Signup and view all the answers

What is the main function of Demilitarized Zone (DMZ) in network security?

<p>To separate a local area network (LAN) from untrusted networks and the internet (D)</p> Signup and view all the answers

What is the purpose of Steganos (as mentioned in the text)?

<p>To hide secret messages inside a particular cover media (D)</p> Signup and view all the answers

What does Steganography mean?

<p>The technique of encryption data/info via mixing it with a key to be protected for an unauthorized person to access these data (B)</p> Signup and view all the answers

What is the main purpose of Cryptography applications?

<p>To encrypt data/info and retain privacy while accessing outside resources (D)</p> Signup and view all the answers

What does Public Key Cryptography (PKC) use for encryption and decryption?

<p>Uses one key for encryption and other key for decryption (B)</p> Signup and view all the answers

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