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



    d)
A) a) to find some insecurity in a cryptographic scheme
B) c) to encrypt the data
C) b) to increase the speed
  • 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) a) stream control transmission protocol (SCTP)
D) c) explicit congestion notification (ECN)
  • 69. Voice privacy in GSM cellular telephone protocol is provided by _______
A) d) b5/8 cipher
B) c) b5/6 cipher
C) a) A5/2 cipher
D) b) b5/4 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) c) both fixed size bit string and variable size bit string
B) a) fixed 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) c) inverse function
B) d) surjective function
C) b) bijective function
D) a) boolean algebra
  • 73. In a transposition cipher, the plaintext is constructed by the ________ of the ciphertext.
A) d) series
B) c) sequence
C) a) permutation
D) b) combination
  • 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) a) Symmetric ciphers
B) d) Alpha-numeric cryptography
C) b) Asymmetric ciphers
D) c) RSA encryption
  • 76. Cryptosystems are used for
A) Privacy & Authentication
B) None of the mentioned
C) Authentication
D) Privacy
  • 77. The key also contains a
A) Plaintext & Ciphertext
B) Ciphertext
C) None of the mentioned
D) Plaintext
  • 78. . The system which has insufficient information available to crypt-analyst is
A) One-time pad & Unconditionally secure
B) Unconditionally secure
C) One-time pad
D) None of the mentioned
  • 79. . In auto key method
A) Can be either necessary or not
B) None of the mentioned
C) Feedback is necessary
D) Feedback is not necessary
  • 80. In Vigenère method ______ is provided.
A) Priming key & Feedback
B) None of the mentioned
C) Feedback
D) Priming key
  • 81. A cipher system is said to have perfect secrecy if
A) None of the mentioned
B) Posteriori probability is less than priori probability
C) Posteriori probability is equal to priori probability
D) Posteriori probability is greater than priori probability
  • 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) Greater, greater
B) Lesser, lesser
C) Lesser, greater
D) Greater, lesser
  • 84. Equivocation is the
A) None of the mentioned
B) Conditional probability of Y given X
C) Conditional probability of X given Y
D) Joint probability of X and Y
  • 85. The maximum number of message bits contained in each character is called as
A) True rate
B) None of the mentioned
C) Optimum rate
D) Absolute 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) All of the mentioned
B) None of the mentioned
C) When unique solution is not available
D) When unique solution is available
  • 88. Which are called as substitution encryption techniques?
A) None of the mentioned
B) Trithemius cipher
C) Caesar & Trithemius cipher
D) Caesar cipher
  • 89. . In substitution technique encryption protection is more.
A) True
B) False
  • 90. The standard building block uses _______ of a key to transform 64-bit input into 64-bit output.
A) 64 bit
B) 128 bit
C) 48 bit
D) 32 bit
  • 91. The 64 bit block input key has _____ number of parity bits.
A) 8
B) 4
C) 6
D) 16
  • 92. One-time pad has
A) Can be used only once
B) Unconditional security
C) Random key
D) All of the mentioned
  • 93. Perfect secrecy can be achieved for
A) None of the mentioned
B) Finite & Infinite number of messages
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) ORing
B) Addition
C) ANDing
D) Modulo 2 addition
  • 95. In which method the key-stream is generated independently of the message?
A) All of the mentioned
B) Self synchronous encryption method
C) Synchronous encryption method
D) None of the mentioned
  • 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) Simultaneously
B) All of the mentioned
C) None of the mentioned
D) One after the other
  • 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) ) Refraction
B) Atmospheric reflections
C) Reflections from buildings
D) All of the mentioned
  • 100. Direct system allows detection of signals whose psd level is
A) All of the mentioned
B) Above noise level
C) None of the mentioned
D) Below noise level
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