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NETSEC - Quiz
Contributed by: Sherwin
  • 1. The information that gets transformed in encryption is ____________
A) c) Encrypted text
B) b) Parallel text
C) d) Decrypted text
D) a) Plain text
  • 2. An algorithm in encryption is called _____________
A) d) Module
B) b) Procedure
C) c) Cipher
D) a) Algorithm
  • 3. Security features that control that can access resources in the OS.
A) d) Access control
B) b) Identification
C) c) Validation
D) a) Authentication
  • 4. A concern of authentication that deals with user rights.
A) a) General access
B) c) Functional authorization
C) b) Functional authentication
D) d) Auto verification
  • 5. 5. The process of verifying the identity of a user.
A) b) Identification
B) d) Verification
C) c) Validation
D) a) Authentication
  • 6. Which of these is a part of network identification?
A) a) UserID
B) b) Password
C) d) fingerprint
D) c) OTP
  • 7. Which is not an objective of network security?
A) c) Access control
B) d) Lock
C) b) Authentication
D) a) Identification
  • 8. The field that covers a variety of computer networks, both public and private, that are used in everyday jobs.
A) c) Network Security
B) d) IT
C) b) ML
D) a) Artificial Intelligence
  • 9. What is internet?
A) b) A collection of unrelated computers
B) a) A network of interconnected local area networks
C) d) A single network
D) c) Interconnection of wide area networks
  • 10. Data communication means,
A) a) Exchange of Packets/Data
B) d) Routing of data
C) c) Data Assembly
D) b) Transmission link
  • 11. What is a computer network?
A) d) The physical casing that protects a computer’s internal components
B) b) A collection of interconnected computers and devices that can communicate and share resources
C) c) A type of software used to create documents and presentations
D) a) A device used to display information on a computer screen
  • 12. Which of the following is an example of Bluetooth?
A) b) virtual private network
B) c) local area network
C) a) wide area network
D) d) personal area network
  • 13. What are nodes in a computer network?
A) b) the computer that terminates the data
B) d) all of the mentioned
C) a) the computer that routes the data
D) c) the computer that originates the data
  • 14. Which one of the following is not a function of network layer?
A) b) error control
B) c) routing
C) a) congestion control
D) d) inter-networking
  • 15. What is the full form of OSI?
A) a) optical service implementation
B) d) operating system interface
C) c) open system interconnection
D) b) open service Internet
  • 16. 16. How many layers are there in the ISO OSI reference model?
A) c) 4
B) a) 7
C) b) 5
D) d) 6
  • 17. Which of the following devices forwards packets between networks by processing the routing information included in the packet?
A) d) router
B) c) hub
C) a) firewall
D) b) bridge
  • 18. Which layer does the data link layer take packets from and encapsulate them into frames for transmission?
A) c) network layer
B) d) physical layer
C) b) application layer
D) a) transport layer
  • 19. . Which of this is not a network edge device or DTE?
A) a) Switch
B) b) PC
C) c) Smartphones
D) d) Servers
  • 20. What was the name of the first network?
A) c) CNNET
B) d) NSFNET
C) b) ARPANET
D) a) ASAPNET
  • 21. Which of the following is the network layer protocol for the internet?
A) c) ethernet
B) d) internet protocol
C) b) file transfer protocol
D) a) hypertext transfer protocol
  • 22. Which of the following allows LAN users to share computer programs and data?
A) a) File server
B) d) Print server
C) c) Communication server
D) b) Network
  • 23. Which layer provides the services to user?
A) b) presentation layer
B) c) session layer
C) d) application layer
D) a) physical layer
  • 24. A ____________ is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, like the internet, preventing unauthorized access and protecting against malicious activity.
A) b) Intrusion detection
B) a) firewall
C) c) Virus scanner
D) d) Buffer overflow detection
  • 25. 25._________________ Is a program that identifies, quarantines, and/or removes viruses and other malware from a computer or device. It works by checking files and system memory for known malware signatures, which are unique digital fingerprints of malicious software.
A) b) Intrusion detection
B) c) Virus scanner
C) d) Buffer overflow detection
D) a) firewall
  • 26. Which is not considered part of about Computer security?
A) a) confidentiality
B) d) reliability
C) b) integrity
D) c) availability
  • 27. Which statement below is not security as trade-off?
A) a) The goal is usually to make the system as secure as possible.
B) c) Sometimes the best security is to make sure you are not the easiest target for an attacker.
C) d) To evaluate what level of security is necessary/appropriate.
D) b) To make the system as secure as possible within certain constraints.
  • 28. Which of following is/are Important to evaluate what level of security is necessary/appropriate?
A) b) Cost of damages from an attack vs. cost of defending against the attack
B) c) Likelihood of a particular attack
C) a) Cost of mounting a particular attack vs. value of attack to an adversary
D) d) All that mentioned.
  • 29. Which of the following is/are considered when security is primarily prioritized?
A) d) All that mentioned.
B) a) Security of a system is only as good as the security at its weakest point…
C) c) Security is a process, not a product
D) b) Security is not a “magic bullet”
  • 30. It protects workloads moving across different cloud and hybrid environments. These distributed workloads have larger attack surfaces, which must be secured without affecting the agility of the business.
A) a) Workload security
B) c) Firewalls
C) d) Access control
D) b) Network security
  • 31. Not every user should have access to your network. To keep out potential attackers, you need to recognize each user and each device. Then you can enforce your security policies. You can block noncompliant endpoint devices or give them only limited access.
A) b) Network security
B) c) Firewalls
C) d) Access control
D) a) Workload security
  • 32. Organizations must make sure that their staff does not send sensitive information outside the network. These technologies can stop people from uploading, forwarding, or even printing critical information in an unsafe manner.
A) b) Email-security
B) c) Industrial network security
C) d) Mobile device security
D) a) Data loss prevention
  • 33. Cybercriminals are increasingly targeting mobile devices and apps. Within the next three years, 90 percent of IT organizations may support corporate applications of course, you need to control which devices can access your network.
A) b) Email-security
B) c) Industrial network security
C) d) Mobile device security
D) a) Data loss prevention
  • 34. As you are digitizing your industrial operations, the deeper integration between IT, cloud, and industrial networks is exposing your Industrial Control Systems (ICS) to cyberthreats.
A) b) Email-security
B) c) Industrial network security
C) d) Mobile device security
D) a) Data loss prevention
  • 35. It pull together the information that your security staff needs to identify and respond to threats. These products come in various forms, including physical and virtual appliances and server software.
A) a) Data loss prevention
B) c) Industrial network security
C) b) Email-security
D) d) Security information and event management
  • 36. This security solution will control your staff's web use, block web-based threats, and deny access to malicious websites. It will protect your web gateway on site or in the cloud, also refers to the steps you take to protect your own website.
A) b) Email-security
B) c) Industrial network security
C) a) Web security
D) d) Mobile device security
  • 37. The process of hiding or coding information so that only the person a message was intended for can read it.
A) b) Cryptography
B) a) Enciphering
C) c) Security
D) d) Authentication
  • 38. ______________________ is usually ordinary readable text before it is encrypted into.
A) b) Ciphertext
B) d) Decryption
C) c) Information
D) a) Plaintext
  • 39. _____________________ encrypted text transformed from plaintext using an encryption algorithm.
A) b) Ciphertext
B) c) Information
C) d) Decryption
D) a) Plaintext
  • 40. The information cannot be understood by anyone for whom it was unintended.
A) c) Non-repudiation
B) a) Confidentiality
C) d) Authentication
D) b) Integrity
  • 41. The information cannot be altered in storage or transit between sender and intended receiver without the alteration being detected.
A) d) Authentication
B) c) Non-repudiation
C) a) Confidentiality
D) b) Integrity
  • 42. The sender and receiver can confirm each other's identity and the origin/destination of the information.
A) d) Authentication
B) b) Integrity
C) c) Non-repudiation
D) a) Confidentiality
  • 43. Use/s a set of procedures known as cryptographic algorithms, or ciphers, to encrypt and decrypt messages to secure communications among computer systems, devices and applications.
A) a) Cryptosystems
B) d) Cryptons
C) b) Cryptology
D) c) Cryptanalysis
  • 44. It uses a pair of keys, a public key associated with the creator/sender for encrypting messages and a private key that only the originator knows (unless it is exposed or they decide to share it) for decrypting that information.
A) c) private key
B) a) asymmetric-key encryption algorithm
C) b) symmetric-key encryption algorithm
D) d) Authentication Key
  • 45. create a fixed length of bits known as a block cipher with a secret key that the creator/sender uses to encipher data (encryption) and the receiver uses to decipher it.
A) c) public key
B) b) symmetric-key encryption algorithm
C) a) asymmetric-key encryption algorithm
D) d) Authentication Key
  • 46. The process of converting encrypted or coded data back into its original, readable format.
A) d) encipher
B) c) Translation
C) a) Encryption
D) b) Decryption
  • 47. The public-key setting dated back to the __________.
A) d) 1950s
B) a) 1970s
C) c) 1960s
D) b) 1980s
  • 48. If two nodes are communicating, then the key they will use is,are ___________________.
A) b) completely randomized.
B) a) shared to both of them.
C) c) kept secret from the attacker.
D) d) All that mentioned.
  • 49. What do call when Two (or more) distinct parties are communicating over an insecure network.
A) d) Fault tolerance
B) a) Canonical application
C) c) Translation
D) b) Data exchange
  • 50. The process of analyzing software or hardware to understand its functionality, architecture, and potentially identify vulnerabilities.
A) d) Not mentioned
B) c) Insider attacks
C) a) Reverse engineering
D) b) Social engineering
  • 51. In cybersecurity is a technique where attackers manipulate individuals into revealing sensitive information or taking actions that compromise security.
A) d) Not mentioned
B) b) Social engineering
C) a) Reverse engineering
D) c) Insider attacks
  • 52. IT attacks often begin with an attacker gathering information about their target, like potential weaknesses or trust levels, to craft a more effective deception.
A) c) Insider attacks
B) b) Social engineering
C) d) Not mentioned
D) a) Reverse engineering
  • 53. It relies on psychological manipulation and deception, rather than technical hacking, to exploit human trust and error.
A) d) Not mentioned
B) a) Reverse engineering
C) c) Insider attacks
D) b) Social engineering
  • 54. Researchers use reverse engineering to understand how malware functions, its behavior, and how it attacks systems.
A) b) Vulnerability assessment
B) d) Security research
C) a) Malware Analysis
D) c) Ethical hacking
  • 55. By analyzing software, security professionals can identify vulnerabilities before attackers exploit them.
A) a) Malware Analysis
B) d) Security research
C) b) Vulnerability assessment
D) c) Ethical hacking
  • 56. Reverse engineering is a key tool in ethical hacking, helping to simulate attacks and strengthen defenses.
A) b) Vulnerability assessment
B) a) Malware Analysis
C) d) Security research
D) c) Ethical hacking
  • 57. It helps in understanding the inner workings of various systems, including software, hardware, and even biological processes.
A) a) Malware Analysis
B) c) Ethical hacking
C) b) Vulnerability assessment
D) d) Security research
  • 58. Reverse engineering may be considered unethical, which one should not be involved?
A) d) All that mentioned.
B) b) Using reverse engineering techniques for malicious purposes, such as developing malware or exploiting vulnerabilities for illicit gain.
C) a) Violating intellectual property rights by illegally copying or distributing proprietary software or technology.
D) c) Breaching confidentiality or privacy laws by accessing or reverse engineering protected information without authorization.
  • 59. Takes a key and a message (plaintext), and outputs a ciphertext.
A) d) Cyber security
B) b) Decryption algorithm
C) c) Security
D) a) Encryption algorithm
  • 60. Takes a key and a ciphertext, and outputs a message (or perhaps an error).
A) c) Security
B) a) Encryption algorithm
C) d) Cyber security
D) b) Decryption algorithm
  • 61. Which of the following that we need to consider the threat model?
A) a) Multiple messages or a single message.
B) c) Chosen-plaintext attacks.
C) d) All that mentioned.
D) b) Passive/active adversary.
  • 62. In cryptography, what is cipher?
A) d) decrypted message
B) a) algorithm for performing encryption and decryption
C) b) encrypted message
D) c) both algorithm for performing encryption and decryption and encrypted message
  • 63. In asymmetric key cryptography, the private key is kept by __________
A) a) sender
B) c) sender and receiver
C) b) receiver
D) d) all the connected devices to the network
  • 64. Which one of the following algorithm is not used in asymmetric-key cryptography?
A) c) electronic code book algorithm
B) d) dsa algorithm
C) a) rsa algorithm
D) b) diffie-hellman algorithm
  • 65. In cryptography, the order of the letters in a message is rearranged by __________
A) c) both transpositional ciphers and substitution ciphers
B) a) transpositional ciphers
C) d) quadratic ciphers
D) b) substitution ciphers
  • 66. What is data encryption standard (DES)?
A) c) bit cipher
B) d) byte cipher
C) a) block cipher
D) b) stream cipher
  • 67. Cryptanalysis is used __________



    d)
A) b) to increase the speed
B) c) to encrypt the data
C) a) to find some insecurity in a cryptographic scheme
  • 68. Which one of the following is a cryptographic protocol used to secure HTTP connection?
A) d) resource reservation protocol
B) a) stream control transmission protocol (SCTP)
C) b) transport layer security (TLS)
D) c) explicit congestion notification (ECN)
  • 69. Voice privacy in GSM cellular telephone protocol is provided by _______
A) c) b5/6 cipher
B) a) A5/2 cipher
C) b) b5/4 cipher
D) d) b5/8 cipher
  • 70. ElGamal encryption system is __________



    d)
A) a) symmetric key encryption algorithm
B) b) asymmetric key encryption algorithm
C) c) not an encryption algorithm
  • 71. Cryptographic hash function takes an arbitrary block of data and returns _________
A) a) fixed size bit string
B) c) both fixed size bit string and variable size bit string
C) d) variable sized byte string
D) b) variable size bit string
  • 72. To encrypt a message _______ is used on the character’s positions.
A) d) surjective function
B) b) bijective function
C) a) boolean algebra
D) c) inverse function
  • 73. In a transposition cipher, the plaintext is constructed by the ________ of the ciphertext.
A) b) combination
B) d) series
C) a) permutation
D) c) sequence
  • 74. _______ is an example of asymmetric ciphers.
A) b) RSA encryption
B) a) Block cipher
C) c) AES encryption
D) d) Advanced cryptology
  • 75. There is no secret key in case of ____________
A) b) Asymmetric ciphers
B) d) Alpha-numeric cryptography
C) c) RSA encryption
D) a) Symmetric ciphers
  • 76. Cryptosystems are used for
A) Privacy
B) None of the mentioned
C) Privacy & Authentication
D) Authentication
  • 77. The key also contains a
A) Plaintext
B) Ciphertext
C) None of the mentioned
D) Plaintext & Ciphertext
  • 78. . The system which has insufficient information available to crypt-analyst is
A) Unconditionally secure
B) One-time pad & Unconditionally secure
C) One-time pad
D) None of the mentioned
  • 79. . In auto key method
A) Can be either necessary or not
B) Feedback is necessary
C) None of the mentioned
D) Feedback is not necessary
  • 80. In Vigenère method ______ is provided.
A) Priming key
B) Feedback
C) None of the mentioned
D) Priming key & Feedback
  • 81. A cipher system is said to have perfect secrecy if
A) Posteriori probability is equal to priori probability
B) Posteriori probability is greater than priori probability
C) Posteriori probability is less than priori probability
D) None of the mentioned
  • 82. The conditions for perfect secrecy are
A) None of the mentioned
B) Only one key transforming message should exist
C) One key transforming message to each cipher text & all keys should be equally likely
D) All keys should be equally likely
  • 83. Only one key transforming message should exist
A) Lesser, greater
B) Lesser, lesser
C) Greater, greater
D) Greater, lesser
  • 84. Equivocation is the
A) Joint probability of X and Y
B) None of the mentioned
C) Conditional probability of Y given X
D) Conditional probability of X given Y
  • 85. The maximum number of message bits contained in each character is called as
A) True rate
B) Absolute rate
C) None of the mentioned
D) Optimum rate
  • 86. When the key size is finite, equivocation approaches
A) Zero
B) None of the mentioned
C) Unity
D) Infinity
  • 87. When a system is called as unbreakable?
A) When unique solution is not available
B) When unique solution is available
C) None of the mentioned
D) All of the mentioned
  • 88. Which are called as substitution encryption techniques?
A) Trithemius cipher
B) Caesar cipher
C) Caesar & Trithemius cipher
D) None of the mentioned
  • 89. . In substitution technique encryption protection is more.
A) False
B) True
  • 90. The standard building block uses _______ of a key to transform 64-bit input into 64-bit output.
A) 64 bit
B) 48 bit
C) 32 bit
D) 128 bit
  • 91. The 64 bit block input key has _____ number of parity bits.
A) 6
B) 4
C) 16
D) 8
  • 92. One-time pad has
A) Unconditional security
B) Can be used only once
C) All of the mentioned
D) Random key
  • 93. Perfect secrecy can be achieved for
A) Finite number of messages
B) Infinite number of messages
C) None of the mentioned
D) Finite & Infinite number of messages
  • 94. The segment of the key-stream of plaintext is obtained by _____ of two sequences together.
A) ORing
B) ANDing
C) Addition
D) Modulo 2 addition
  • 95. In which method the key-stream is generated independently of the message?
A) All of the mentioned
B) None of the mentioned
C) Self synchronous encryption method
D) Synchronous encryption method
  • 96. . In which method cipher feedback is used?
A) All of the mentioned
B) None of the mentioned
C) Synchronous encryption method
D) Self synchronous encryption method
  • 97. Spread spectrum multiple access techniques allows the multiple signal to be transmitted
A) One after the other
B) Simultaneously
C) All of the mentioned
D) None of the mentioned
  • 98. In CDMA, the users share the bandwidth
A) None of the mentioned
B) Asynchronously
C) Synchronously
D) Synchronously & Asynchronously
  • 99. Multi paths may be because of
A) Reflections from buildings
B) All of the mentioned
C) ) Refraction
D) Atmospheric reflections
  • 100. Direct system allows detection of signals whose psd level is
A) Below noise level
B) None of the mentioned
C) All of the mentioned
D) Above noise level
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