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NETSEC
  • 1. The information that gets transformed in encryption is ____________
A) c) Encrypted text
B) d) Decrypted text
C) a) Plain text
D) b) Parallel text
  • 2. An algorithm in encryption is called _____________
A) b) Procedure
B) d) Module
C) c) Cipher
D) a) Algorithm
  • 3. Security features that control that can access resources in the OS.
A) a) Authentication
B) b) Identification
C) d) Access control
D) c) Validation
  • 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) c) Validation
B) b) Identification
C) a) Authentication
D) d) Verification
  • 6. Which of these is a part of network identification?
A) c) OTP
B) b) Password
C) a) UserID
D) d) fingerprint
  • 7. Which is not an objective of network security?
A) c) Access control
B) a) Identification
C) d) Lock
D) b) Authentication
  • 8. The field that covers a variety of computer networks, both public and private, that are used in everyday jobs.
A) d) IT
B) a) Artificial Intelligence
C) c) Network Security
D) b) ML
  • 9. What is internet?
A) d) A single network
B) a) A network of interconnected local area networks
C) b) A collection of unrelated computers
D) c) Interconnection of wide area networks
  • 10. Data communication means,
A) b) Transmission link
B) a) Exchange of Packets/Data
C) c) Data Assembly
D) d) Routing of data
  • 11. What is a computer network?
A) b) A collection of interconnected computers and devices that can communicate and share resources
B) c) A type of software used to create documents and presentations
C) a) A device used to display information on a computer screen
D) d) The physical casing that protects a computer’s internal components
  • 12. Which of the following is an example of Bluetooth?
A) c) local area network
B) a) wide area network
C) b) virtual private network
D) d) personal area network
  • 13. What are nodes in a computer network?
A) d) all of the mentioned
B) a) the computer that routes the data
C) b) the computer that terminates the data
D) c) the computer that originates the data
  • 14. Which one of the following is not a function of network layer?
A) d) inter-networking
B) b) error control
C) a) congestion control
D) c) routing
  • 15. What is the full form of OSI?
A) a) optical service implementation
B) c) open system interconnection
C) d) operating system interface
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) d) 6
D) b) 5
  • 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) b) application layer
B) c) network layer
C) d) physical layer
D) a) transport layer
  • 19. . Which of this is not a network edge device or DTE?
A) a) Switch
B) c) Smartphones
C) b) PC
D) d) Servers
  • 20. What was the name of the first network?
A) c) CNNET
B) a) ASAPNET
C) d) NSFNET
D) b) ARPANET
  • 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) c) Communication server
C) a) File server
D) d) Print server
  • 23. Which layer provides the services to user?
A) b) presentation layer
B) d) application layer
C) a) physical 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) a) firewall
B) b) Intrusion detection
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) 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) c) Sometimes the best security is to make sure you are not the easiest target for an attacker.
C) a) The goal is usually to make the system as secure as possible.
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) d) All that mentioned.
B) b) Cost of damages from an attack vs. cost of defending against the attack
C) c) Likelihood of a particular attack
D) a) Cost of mounting a particular attack vs. value of attack to an adversary
  • 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) d) All that mentioned.
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) 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) b) Email-security
B) d) Mobile device security
C) c) Industrial network 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) d) Mobile device security
B) c) Industrial network security
C) b) Email-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) c) Industrial network security
C) b) Email-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) c) Industrial network security
B) b) Email-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) d) Mobile device security
B) a) Web 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) a) Enciphering
C) b) Cryptography
D) c) Security
  • 38. ______________________ is usually ordinary readable text before it is encrypted into.
A) b) Ciphertext
B) c) Information
C) a) Plaintext
D) d) Decryption
  • 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) b) Integrity
B) a) Confidentiality
C) c) Non-repudiation
D) d) Authentication
  • 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) d) Authentication
C) b) Integrity
D) a) Confidentiality
  • 42. The sender and receiver can confirm each other's identity and the origin/destination of the information.
A) b) Integrity
B) a) Confidentiality
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) c) Cryptanalysis
C) b) Cryptology
D) d) Cryptons
  • 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) b) symmetric-key encryption algorithm
B) a) asymmetric-key encryption algorithm
C) c) private key
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) a) asymmetric-key encryption algorithm
C) b) symmetric-key encryption algorithm
D) d) Authentication Key
  • 46. The process of converting encrypted or coded data back into its original, readable format.
A) b) Decryption
B) a) Encryption
C) c) Translation
D) d) encipher
  • 47. The public-key setting dated back to the __________.
A) c) 1960s
B) b) 1980s
C) d) 1950s
D) a) 1970s
  • 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) a) shared to both of them.
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) a) Canonical application
C) c) Translation
D) d) Fault tolerance
  • 50. The process of analyzing software or hardware to understand its functionality, architecture, and potentially identify vulnerabilities.
A) d) Not mentioned
B) a) Reverse engineering
C) b) Social 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) c) Insider attacks
B) a) Reverse engineering
C) d) Not mentioned
D) b) Social engineering
  • 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) d) Not mentioned
C) a) Reverse engineering
D) b) Social engineering
  • 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) a) Reverse engineering
D) d) Not mentioned
  • 54. Researchers use reverse engineering to understand how malware functions, its behavior, and how it attacks systems.
A) b) Vulnerability assessment
B) c) Ethical hacking
C) a) Malware Analysis
D) d) Security research
  • 55. By analyzing software, security professionals can identify vulnerabilities before attackers exploit them.
A) d) Security research
B) a) Malware Analysis
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) c) Ethical hacking
B) d) Security research
C) b) Vulnerability assessment
D) a) Malware Analysis
  • 58. Reverse engineering may be considered unethical, which one should not be involved?
A) a) Violating intellectual property rights by illegally copying or distributing proprietary software or technology.
B) c) Breaching confidentiality or privacy laws by accessing or reverse engineering protected information without authorization.
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) c) Security
D) d) Cyber 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) c) Security
D) d) Cyber 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) b) Passive/active adversary.
D) d) All that mentioned.
  • 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) a) sender
B) d) all the connected devices to the network
C) c) sender and receiver
D) b) receiver
  • 64. Which one of the following algorithm is not used in asymmetric-key cryptography?
A) b) diffie-hellman algorithm
B) a) rsa algorithm
C) c) electronic code book algorithm
D) d) dsa 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) c) bit cipher
B) a) block cipher
C) d) byte 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) b) transport layer security (TLS)
B) a) stream control transmission protocol (SCTP)
C) c) explicit congestion notification (ECN)
D) d) resource reservation protocol
  • 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) b) asymmetric key encryption algorithm
B) c) not an encryption algorithm
C) a) symmetric key encryption algorithm
  • 71. Cryptographic hash function takes an arbitrary block of data and returns _________
A) a) fixed size bit string
B) b) variable 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) d) surjective function
B) b) bijective function
C) c) inverse function
D) a) boolean algebra
  • 73. In a transposition cipher, the plaintext is constructed by the ________ of the ciphertext.
A) c) sequence
B) d) series
C) b) combination
D) a) permutation
  • 74. _______ is an example of asymmetric ciphers.
A) c) AES encryption
B) d) Advanced cryptology
C) b) RSA encryption
D) a) Block cipher
  • 75. There is no secret key in case of ____________
A) b) Asymmetric ciphers
B) c) RSA encryption
C) d) Alpha-numeric cryptography
D) a) Symmetric ciphers
  • 76. Cryptosystems are used for
A) None of the mentioned
B) Privacy & Authentication
C) Privacy
D) Authentication
  • 77. The key also contains a
A) Ciphertext
B) None of the mentioned
C) Plaintext
D) Plaintext & Ciphertext
  • 78. . The system which has insufficient information available to crypt-analyst is
A) None of the mentioned
B) One-time pad
C) Unconditionally secure
D) One-time pad & Unconditionally secure
  • 79. . In auto key method
A) Feedback is necessary
B) None of the mentioned
C) Can be either necessary or not
D) Feedback is not necessary
  • 80. In Vigenère method ______ is provided.
A) Feedback
B) Priming key
C) None of the mentioned
D) Priming key & Feedback
  • 81. A cipher system is said to have perfect secrecy if
A) Posteriori probability is less than priori probability
B) Posteriori probability is equal to priori probability
C) None of the mentioned
D) Posteriori probability is greater than priori probability
  • 82. The conditions for perfect secrecy are
A) All keys should be equally likely
B) One key transforming message to each cipher text & all keys should be equally likely
C) Only one key transforming message should exist
D) None of the mentioned
  • 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) None of the mentioned
B) Joint probability of X and Y
C) Conditional probability of X given Y
D) Conditional probability of Y given X
  • 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) None of the mentioned
B) Unity
C) Infinity
D) Zero
  • 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) Caesar cipher
B) Caesar & Trithemius cipher
C) Trithemius cipher
D) None of the mentioned
  • 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) 48 bit
C) 32 bit
D) 128 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) Random key
C) Unconditional security
D) All of the mentioned
  • 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) ANDing
B) Addition
C) Modulo 2 addition
D) ORing
  • 95. In which method the key-stream is generated independently of the message?
A) None of the mentioned
B) Self synchronous encryption method
C) Synchronous encryption method
D) All of the mentioned
  • 96. . In which method cipher feedback is used?
A) Synchronous encryption method
B) Self synchronous encryption method
C) None of the mentioned
D) All of the mentioned
  • 97. Spread spectrum multiple access techniques allows the multiple signal to be transmitted
A) None of the mentioned
B) One after the other
C) Simultaneously
D) All of the mentioned
  • 98. In CDMA, the users share the bandwidth
A) Synchronously
B) Synchronously & Asynchronously
C) None of the mentioned
D) 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) None of the mentioned
B) Above noise level
C) Below noise level
D) All of the mentioned
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