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NETSEC
  • 1. The information that gets transformed in encryption is ____________
A) a) Plain text
B) d) Decrypted text
C) c) Encrypted text
D) b) Parallel text
  • 2. An algorithm in encryption is called _____________
A) b) Procedure
B) d) Module
C) a) Algorithm
D) c) Cipher
  • 3. Security features that control that can access resources in the OS.
A) a) Authentication
B) d) Access control
C) c) Validation
D) b) Identification
  • 4. A concern of authentication that deals with user rights.
A) d) Auto verification
B) c) Functional authorization
C) b) Functional authentication
D) a) General access
  • 5. 5. The process of verifying the identity of a user.
A) a) Authentication
B) b) Identification
C) c) Validation
D) d) Verification
  • 6. Which of these is a part of network identification?
A) a) UserID
B) c) OTP
C) d) fingerprint
D) b) Password
  • 7. Which is not an objective of network security?
A) d) Lock
B) b) Authentication
C) a) Identification
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) a) Artificial Intelligence
B) b) ML
C) d) IT
D) c) Network Security
  • 9. What is internet?
A) d) A single network
B) a) A network of interconnected local area networks
C) c) Interconnection of wide area networks
D) b) A collection of unrelated computers
  • 10. Data communication means,
A) b) Transmission link
B) d) Routing of data
C) a) Exchange of Packets/Data
D) c) Data Assembly
  • 11. What is a computer network?
A) a) A device used to display information on a computer screen
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) d) The physical casing that protects a computer’s internal components
  • 12. Which of the following is an example of Bluetooth?
A) d) personal area network
B) a) wide area network
C) c) local area network
D) b) virtual private network
  • 13. What are nodes in a computer network?
A) d) all of the mentioned
B) b) the computer that terminates the data
C) c) the computer that originates the data
D) a) the computer that routes the data
  • 14. Which one of the following is not a function of network layer?
A) c) routing
B) d) inter-networking
C) b) error control
D) a) congestion control
  • 15. What is the full form of OSI?
A) b) open service Internet
B) c) open system interconnection
C) a) optical service implementation
D) d) operating system interface
  • 16. 16. How many layers are there in the ISO OSI reference model?
A) b) 5
B) a) 7
C) c) 4
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) b) bridge
D) a) firewall
  • 18. Which layer does the data link layer take packets from and encapsulate them into frames for transmission?
A) b) application layer
B) c) network layer
C) a) transport layer
D) d) physical layer
  • 19. . Which of this is not a network edge device or DTE?
A) b) PC
B) a) Switch
C) d) Servers
D) c) Smartphones
  • 20. What was the name of the first network?
A) a) ASAPNET
B) c) CNNET
C) d) NSFNET
D) b) ARPANET
  • 21. Which of the following is the network layer protocol for the internet?
A) d) internet protocol
B) a) hypertext transfer protocol
C) b) file transfer protocol
D) c) ethernet
  • 22. Which of the following allows LAN users to share computer programs and data?
A) c) Communication server
B) d) Print server
C) a) File server
D) b) Network
  • 23. Which layer provides the services to user?
A) a) physical layer
B) b) presentation layer
C) d) application layer
D) c) session 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) c) Virus scanner
B) d) Buffer overflow detection
C) b) Intrusion 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) c) Virus scanner
B) a) firewall
C) b) Intrusion detection
D) d) Buffer overflow detection
  • 26. Which is not considered part of about Computer security?
A) b) integrity
B) c) availability
C) a) confidentiality
D) d) reliability
  • 27. Which statement below is not security as trade-off?
A) d) To evaluate what level of security is necessary/appropriate.
B) b) To make the system as secure as possible within certain constraints.
C) a) The goal is usually to make the system as secure as possible.
D) c) Sometimes the best security is to make sure you are not the easiest target for an attacker.
  • 28. Which of following is/are Important to evaluate what level of security is necessary/appropriate?
A) a) Cost of mounting a particular attack vs. value of attack to an adversary
B) d) All that mentioned.
C) b) Cost of damages from an attack vs. cost of defending against the attack
D) c) Likelihood of a particular attack
  • 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) d) All that mentioned.
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) b) Network security
B) a) Workload security
C) c) Firewalls
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) a) Workload security
B) d) Access control
C) c) Firewalls
D) b) Network 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) a) Data loss prevention
B) c) Industrial network security
C) b) Email-security
D) d) Mobile device 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) a) Data loss prevention
B) d) Mobile device security
C) c) Industrial network security
D) b) Email-security
  • 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) d) Mobile device security
B) c) Industrial network security
C) b) Email-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) d) Security information and event management
B) a) Data loss prevention
C) b) Email-security
D) c) Industrial network security
  • 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) d) Mobile device security
B) b) Email-security
C) a) Web 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) c) Security
B) b) Cryptography
C) d) Authentication
D) a) Enciphering
  • 38. ______________________ is usually ordinary readable text before it is encrypted into.
A) b) Ciphertext
B) a) Plaintext
C) c) Information
D) d) Decryption
  • 39. _____________________ encrypted text transformed from plaintext using an encryption algorithm.
A) a) Plaintext
B) b) Ciphertext
C) d) Decryption
D) c) Information
  • 40. The information cannot be understood by anyone for whom it was unintended.
A) a) Confidentiality
B) c) Non-repudiation
C) b) Integrity
D) d) Authentication
  • 41. The information cannot be altered in storage or transit between sender and intended receiver without the alteration being detected.
A) a) Confidentiality
B) b) Integrity
C) d) Authentication
D) c) Non-repudiation
  • 42. The sender and receiver can confirm each other's identity and the origin/destination of the information.
A) b) Integrity
B) c) Non-repudiation
C) d) Authentication
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) c) Cryptanalysis
C) d) Cryptons
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) a) asymmetric-key encryption algorithm
B) c) private key
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) a) asymmetric-key encryption algorithm
B) d) Authentication Key
C) c) public key
D) b) symmetric-key encryption algorithm
  • 46. The process of converting encrypted or coded data back into its original, readable format.
A) a) Encryption
B) b) Decryption
C) c) Translation
D) d) encipher
  • 47. The public-key setting dated back to the __________.
A) c) 1960s
B) a) 1970s
C) b) 1980s
D) d) 1950s
  • 48. If two nodes are communicating, then the key they will use is,are ___________________.
A) d) All that mentioned.
B) b) completely randomized.
C) a) shared to both of them.
D) c) kept secret from the attacker.
  • 49. What do call when Two (or more) distinct parties are communicating over an insecure network.
A) c) Translation
B) b) Data exchange
C) a) Canonical application
D) d) Fault tolerance
  • 50. The process of analyzing software or hardware to understand its functionality, architecture, and potentially identify vulnerabilities.
A) b) Social engineering
B) c) Insider attacks
C) d) Not mentioned
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) c) Insider attacks
C) b) Social engineering
D) d) Not mentioned
  • 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) d) Not mentioned
B) a) Reverse engineering
C) b) Social engineering
D) c) Insider attacks
  • 53. It relies on psychological manipulation and deception, rather than technical hacking, to exploit human trust and error.
A) c) Insider attacks
B) d) Not mentioned
C) b) Social engineering
D) a) Reverse engineering
  • 54. Researchers use reverse engineering to understand how malware functions, its behavior, and how it attacks systems.
A) d) Security research
B) a) Malware Analysis
C) c) Ethical hacking
D) b) Vulnerability assessment
  • 55. By analyzing software, security professionals can identify vulnerabilities before attackers exploit them.
A) d) Security research
B) c) Ethical hacking
C) a) Malware Analysis
D) b) Vulnerability assessment
  • 56. Reverse engineering is a key tool in ethical hacking, helping to simulate attacks and strengthen defenses.
A) d) Security research
B) a) Malware Analysis
C) c) Ethical hacking
D) b) Vulnerability assessment
  • 57. It helps in understanding the inner workings of various systems, including software, hardware, and even biological processes.
A) d) Security research
B) c) Ethical hacking
C) a) Malware Analysis
D) b) Vulnerability assessment
  • 58. Reverse engineering may be considered unethical, which one should not be involved?
A) c) Breaching confidentiality or privacy laws by accessing or reverse engineering protected information without authorization.
B) a) Violating intellectual property rights by illegally copying or distributing proprietary software or technology.
C) b) Using reverse engineering techniques for malicious purposes, such as developing malware or exploiting vulnerabilities for illicit gain.
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) d) Cyber security
C) b) Decryption algorithm
D) c) Security
  • 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) a) algorithm for performing encryption and decryption
B) b) encrypted message
C) d) decrypted 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) c) sender and receiver
B) a) sender
C) d) all the connected devices to the network
D) b) receiver
  • 64. Which one of the following algorithm is not used in asymmetric-key cryptography?
A) d) dsa algorithm
B) b) diffie-hellman algorithm
C) a) rsa algorithm
D) c) electronic code book algorithm
  • 65. In cryptography, the order of the letters in a message is rearranged by __________
A) a) transpositional ciphers
B) d) quadratic ciphers
C) b) substitution ciphers
D) c) both transpositional ciphers and substitution ciphers
  • 66. What is data encryption standard (DES)?
A) a) block cipher
B) b) stream cipher
C) c) bit cipher
D) d) byte 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) b) transport layer security (TLS)
C) c) explicit congestion notification (ECN)
D) a) stream control transmission protocol (SCTP)
  • 69. Voice privacy in GSM cellular telephone protocol is provided by _______
A) c) b5/6 cipher
B) d) b5/8 cipher
C) a) A5/2 cipher
D) b) b5/4 cipher
  • 70. ElGamal encryption system is __________



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