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NETSEC
  • 1. The information that gets transformed in encryption is ____________
A) a) Plain text
B) c) Encrypted text
C) b) Parallel text
D) d) Decrypted text
  • 2. An algorithm in encryption is called _____________
A) a) Algorithm
B) d) Module
C) b) Procedure
D) c) Cipher
  • 3. Security features that control that can access resources in the OS.
A) d) Access control
B) a) Authentication
C) b) Identification
D) c) Validation
  • 4. A concern of authentication that deals with user rights.
A) a) General access
B) b) Functional authentication
C) d) Auto verification
D) c) Functional authorization
  • 5. 5. The process of verifying the identity of a user.
A) a) Authentication
B) c) Validation
C) b) Identification
D) d) Verification
  • 6. Which of these is a part of network identification?
A) a) UserID
B) c) OTP
C) b) Password
D) d) fingerprint
  • 7. Which is not an objective of network security?
A) d) Lock
B) a) Identification
C) b) Authentication
D) c) Access control
  • 8. The field that covers a variety of computer networks, both public and private, that are used in everyday jobs.
A) d) IT
B) c) Network Security
C) a) Artificial Intelligence
D) b) ML
  • 9. What is internet?
A) b) A collection of unrelated computers
B) d) A single network
C) a) A network of interconnected local area networks
D) c) Interconnection of wide area networks
  • 10. Data communication means,
A) d) Routing of data
B) c) Data Assembly
C) b) Transmission link
D) a) Exchange of Packets/Data
  • 11. What is a computer network?
A) d) The physical casing that protects a computer’s internal components
B) a) A device used to display information on a computer screen
C) c) A type of software used to create documents and presentations
D) b) A collection of interconnected computers and devices that can communicate and share resources
  • 12. Which of the following is an example of Bluetooth?
A) a) wide area network
B) d) personal area network
C) c) local area network
D) b) virtual private network
  • 13. What are nodes in a computer network?
A) a) the computer that routes the data
B) d) all of the mentioned
C) c) the computer that originates the data
D) b) the computer that terminates the data
  • 14. Which one of the following is not a function of network layer?
A) a) congestion control
B) d) inter-networking
C) c) routing
D) b) error control
  • 15. What is the full form of OSI?
A) a) optical service implementation
B) c) open system interconnection
C) b) open service Internet
D) d) operating system interface
  • 16. 16. How many layers are there in the ISO OSI reference model?
A) a) 7
B) c) 4
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) a) firewall
C) c) hub
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) b) PC
B) a) Switch
C) c) Smartphones
D) d) Servers
  • 20. What was the name of the first network?
A) d) NSFNET
B) b) ARPANET
C) c) CNNET
D) a) ASAPNET
  • 21. Which of the following is the network layer protocol for the internet?
A) b) file transfer protocol
B) a) hypertext transfer protocol
C) d) internet protocol
D) c) ethernet
  • 22. Which of the following allows LAN users to share computer programs and data?
A) b) Network
B) d) Print server
C) a) File server
D) c) Communication server
  • 23. Which layer provides the services to user?
A) b) presentation layer
B) d) application layer
C) c) session 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) c) Virus scanner
C) d) Buffer overflow detection
D) a) firewall
  • 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) a) firewall
B) b) Intrusion detection
C) d) Buffer overflow detection
D) c) Virus scanner
  • 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) c) Sometimes the best security is to make sure you are not the easiest target for an attacker.
B) d) To evaluate what level of security is necessary/appropriate.
C) b) To make the system as secure as possible within certain constraints.
D) a) The goal is usually to make the system as secure as possible.
  • 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) a) Cost of mounting a particular attack vs. value of attack to an adversary
C) c) Likelihood of a particular attack
D) d) All that mentioned.
  • 29. Which of the following is/are considered when security is primarily prioritized?
A) a) Security of a system is only as good as the security at its weakest point…
B) c) Security is a process, not a product
C) b) Security is not a “magic bullet”
D) d) All that mentioned.
  • 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) c) Firewalls
B) a) Workload security
C) b) Network security
D) d) Access control
  • 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) a) Workload security
D) d) Access control
  • 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) a) Data loss prevention
B) b) Email-security
C) d) Mobile device security
D) c) Industrial network security
  • 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) c) Industrial network security
B) b) Email-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) a) Data loss prevention
B) b) Email-security
C) c) Industrial network security
D) d) Mobile device security
  • 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) b) Email-security
B) c) Industrial network security
C) d) Security information and event management
D) a) Data loss prevention
  • 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) a) Web security
B) d) Mobile device security
C) b) Email-security
D) c) Industrial network security
  • 37. The process of hiding or coding information so that only the person a message was intended for can read it.
A) d) Authentication
B) b) Cryptography
C) a) Enciphering
D) c) Security
  • 38. ______________________ is usually ordinary readable text before it is encrypted into.
A) c) Information
B) b) Ciphertext
C) a) Plaintext
D) d) Decryption
  • 39. _____________________ encrypted text transformed from plaintext using an encryption algorithm.
A) c) Information
B) b) Ciphertext
C) d) Decryption
D) a) Plaintext
  • 40. The information cannot be understood by anyone for whom it was unintended.
A) a) Confidentiality
B) c) Non-repudiation
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) b) Integrity
C) a) Confidentiality
D) c) Non-repudiation
  • 42. The sender and receiver can confirm each other's identity and the origin/destination of the information.
A) a) Confidentiality
B) b) Integrity
C) c) Non-repudiation
D) d) Authentication
  • 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) c) Cryptanalysis
D) b) Cryptology
  • 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) d) Authentication Key
D) b) symmetric-key encryption algorithm
  • 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) a) asymmetric-key encryption algorithm
B) b) symmetric-key encryption algorithm
C) c) public key
D) d) Authentication Key
  • 46. The process of converting encrypted or coded data back into its original, readable format.
A) a) Encryption
B) d) encipher
C) b) Decryption
D) c) Translation
  • 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) a) shared to both of them.
B) d) All that mentioned.
C) c) kept secret from the attacker.
D) b) completely randomized.
  • 49. What do call when Two (or more) distinct parties are communicating over an insecure network.
A) b) Data exchange
B) d) Fault tolerance
C) c) Translation
D) a) Canonical application
  • 50. The process of analyzing software or hardware to understand its functionality, architecture, and potentially identify vulnerabilities.
A) c) Insider attacks
B) d) Not mentioned
C) b) Social engineering
D) a) Reverse engineering
  • 51. In cybersecurity is a technique where attackers manipulate individuals into revealing sensitive information or taking actions that compromise security.
A) a) Reverse engineering
B) b) Social engineering
C) d) Not mentioned
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) b) Social engineering
B) a) Reverse engineering
C) c) Insider attacks
D) d) Not mentioned
  • 53. It relies on psychological manipulation and deception, rather than technical hacking, to exploit human trust and error.
A) d) Not mentioned
B) b) Social engineering
C) c) Insider attacks
D) a) Reverse engineering
  • 54. Researchers use reverse engineering to understand how malware functions, its behavior, and how it attacks systems.
A) c) Ethical hacking
B) d) Security research
C) b) Vulnerability assessment
D) a) Malware Analysis
  • 55. By analyzing software, security professionals can identify vulnerabilities before attackers exploit them.
A) a) Malware Analysis
B) c) Ethical hacking
C) b) Vulnerability assessment
D) d) Security research
  • 56. Reverse engineering is a key tool in ethical hacking, helping to simulate attacks and strengthen defenses.
A) d) Security research
B) c) Ethical hacking
C) a) Malware Analysis
D) b) Vulnerability assessment
  • 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) d) Security research
D) b) Vulnerability assessment
  • 58. Reverse engineering may be considered unethical, which one should not be involved?
A) b) Using reverse engineering techniques for malicious purposes, such as developing malware or exploiting vulnerabilities for illicit gain.
B) a) Violating intellectual property rights by illegally copying or distributing proprietary software or technology.
C) c) Breaching confidentiality or privacy laws by accessing or reverse engineering protected information without authorization.
D) d) All that mentioned.
  • 59. Takes a key and a message (plaintext), and outputs a ciphertext.
A) a) Encryption algorithm
B) b) Decryption algorithm
C) d) Cyber security
D) c) Security
  • 60. Takes a key and a ciphertext, and outputs a message (or perhaps an error).
A) a) Encryption algorithm
B) b) Decryption algorithm
C) d) Cyber security
D) c) Security
  • 61. Which of the following that we need to consider the threat model?
A) c) Chosen-plaintext attacks.
B) d) All that mentioned.
C) a) Multiple messages or a single message.
D) b) Passive/active adversary.
  • 62. In cryptography, what is cipher?
A) b) encrypted message
B) c) both algorithm for performing encryption and decryption and encrypted message
C) d) decrypted message
D) a) algorithm for performing encryption and decryption
  • 63. In asymmetric key cryptography, the private key is kept by __________
A) b) receiver
B) c) sender and receiver
C) a) sender
D) d) all the connected devices to the network
  • 64. Which one of the following algorithm is not used in asymmetric-key cryptography?
A) a) rsa algorithm
B) d) dsa algorithm
C) c) electronic code book algorithm
D) b) diffie-hellman algorithm
  • 65. In cryptography, the order of the letters in a message is rearranged by __________
A) d) quadratic ciphers
B) c) both transpositional ciphers and substitution ciphers
C) a) transpositional ciphers
D) b) substitution ciphers
  • 66. What is data encryption standard (DES)?
A) d) byte cipher
B) a) block cipher
C) c) bit cipher
D) b) stream cipher
  • 67. Cryptanalysis is used __________



    d)
A) c) to encrypt the data
B) b) to increase the speed
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) a) stream control transmission protocol (SCTP)
B) b) transport layer security (TLS)
C) d) resource reservation protocol
D) c) explicit congestion notification (ECN)
  • 69. Voice privacy in GSM cellular telephone protocol is provided by _______
A) a) A5/2 cipher
B) d) b5/8 cipher
C) b) b5/4 cipher
D) c) b5/6 cipher
  • 70. ElGamal encryption system is __________



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