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  1. Which class of IP address provides the largest number of hosts per network?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: a. Class Awikipedia+2
  2. What is the starting range of a Class B IP address?
    a. 192
    b. 128
    c. 224
    d. 240
    Answer: b. 128youstable+1
  3. Which class of IP address is specifically reserved for multicast purposes?
    a. Class A
    b. Class C
    c. Class D
    d. Class E
    Answer: c. Class Deukhost+2
  4. The default subnet mask for a Class C network is:
    a. 255.0.0.0
    b. 255.255.255.0
    c. 255.255.0.0
    d. 255.255.255.255
    Answer: b. 255.255.255.0wikipedia+2
  5. Which class of IP address has a range from 240.0.0.0 to 255.255.255.255?
    a. Class B
    b. Class C
    c. Class D
    d. Class E
    Answer: d. Class Eyoustable+1
  6. Which leading bit(s) pattern identifies a Class C IP address?
    a. 0
    b. 10
    c. 110
    d. 1110
    Answer: c. 110tutorialspoint+1
  7. How many total possible networks are in Class A?
    a. 126
    b. 16,384
    c. 2,097,152
    d. 254
    Answer: a. 126techtarget+1
  8. A Class A address always has its first octet in what range?
    a. 1-126
    b. 128-191
    c. 192-223
    d. 224-239
    Answer: a. 1-126techtarget+2
  9. Which class provides the smallest number of hosts per network but the largest number of network IDs?
    a. Class B
    b. Class C
    c. Class D
    d. Class A
    Answer: b. Class Ceukhost+2
  10. What is the primary use of Class E addresses?
    a. Public addressing
    b. Multicast traffic
    c. Experimental purposes
    d. Loopback testing
    Answer: c. Experimental purposeswikipedia+2
  11. Which class of address is used by default for multicast communication?
    a. Class C
    b. Class E
    c. Class D
    d. Class A
    Answer: c. Class Dtechtarget+1
  12. The valid range for Class A network addresses is:
    a. 0.0.0.0 to 127.255.255.255
    b. 1.0.0.0 to 126.255.255.255
    c. 128.0.0.0 to 191.255.255.255
    d. 192.0.0.0 to 223.255.255.255
    Answer: b. 1.0.0.0 to 126.255.255.255meridianoutpost+2
  13. The default subnet mask for a Class B network is:
    a. 255.255.255.0
    b. 255.255.0.0
    c. 255.0.0.0
    d. 255.255.255.255
    Answer: b. 255.255.0.0youstable+2
  14. An IP address starting with 192 falls into which class?
    a. A
    b. B
    c. C
    d. D
    Answer: c. Cwikipedia+2
  15. Which of the following is NOT a valid class in IPv4 addressing?
    a. Class F
    b. Class D
    c. Class C
    d. Class E
    Answer: a. Class Fstudy-ccna+2
  16. The private IP range for Class A addresses is:
    a. 172.16.0.0 to 172.31.255.255
    b. 10.0.0.0 to 10.255.255.255
    c. 192.168.0.0 to 192.168.255.255
    d. 1.0.0.0 to 126.255.255.255
    Answer: b. 10.0.0.0 to 10.255.255.255ipstack+1
  17. How many hosts can a single Class C network support (excluding network/broadcast addresses)?
    a. 256
    b. 254
    c. 65,534
    d. 16,777,214
    Answer: b. 254eukhost+2
  18. Which class of IP address is 156.45.67.89?
    a. A
    b. B
    c. C
    d. D
    Answer: b. Byoustable+2
  19. Loopback addresses are reserved from which range?
    a. 127.0.0.0 to 127.255.255.255
    b. 10.0.0.0 to 10.255.255.255
    c. 224.0.0.0 to 239.255.255.255
    d. 255.0.0.0 to 255.255.255.255
    Answer: a. 127.0.0.0 to 127.255.255.255meridianoutpost+2
  20. What is the highest octet value for a valid Class C address?
    a. 221
    b. 223
    c. 224
    d. 239
    Answer: b. 223eukhost+2
  21. How many bits are designated as the network part in a Class B address?
    a. 8
    b. 16
    c. 24
    d. 32
    Answer: b. 1630dayscoding+2
  22. What are the leading bits for Class D addresses?
    a. 0
    b. 10
    c. 110
    d. 1110
    Answer: d. 1110tutorialspoint+1
  23. Which is the default subnet mask for a Class A address?
    a. 255.0.0.0
    b. 255.255.255.0
    c. 255.255.0.0
    d. 255.255.255.255
    Answer: a. 255.0.0.0wikipedia+2
  24. What is the first octet range for Class B IP addresses?
    a. 0–127
    b. 128–191
    c. 192–223
    d. 224–239
    Answer: b. 128–191youstable+2
  25. Which IP class is most appropriate for a small business requiring only a few dozen host addresses?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: c. Class C30dayscoding+2
  26. Which of the following is TRUE for Class E addresses?
    a. They are for mobile devices.
    b. They are reserved for future or experimental use.
    c. They are used for video streaming.
    d. They are used for DNS only.
    Answer: b. They are reserved for future or experimental use.techtarget+2
  27. The number of available host addresses in a Class B network is:
    a. 126
    b. 254
    c. 65,534
    d. 16,777,216
    Answer: c. 65,534eukhost+2
  28. The maximum number of hosts per Class A network (excluding reserved addresses) is:
    a. 254
    b. 65,534
    c. 16,777,214
    d. 2,097,152
    Answer: c. 16,777,214techtarget+2
  29. What is the minimum value for a valid first octet in a Class C address?
    a. 192
    b. 128
    c. 193
    d. 224
    Answer: a. 192wikipedia+2
  30. Which class encompasses addresses from 224.0.0.0 to 239.255.255.255?
    a. A
    b. B
    c. C
    d. D
    Answer: d. Dyoustable+2
  31. The range 240.0.0.0 to 255.255.255.255 is reserved for:
    a. Loopback
    b. Broadcasting
    c. Multicast
    d. Reserved/Experimental
    Answer: d. Reserved/Experimentaleukhost+1
  32. What is the valid range of the first octet in Class A?
    a. 0-127
    b. 1-126
    c. 128-191
    d. 192-223
    Answer: b. 1-126geeksforgeeks+1
  33. Which address is automatically assigned as a loopback address in IPv4?
    a. 192.168.1.1
    b. 127.0.0.1
    c. 10.0.0.1
    d. 224.0.0.1
    Answer: b. 127.0.0.1meridianoutpost+2
  34. The class that supports the highest number of networks is:
    a. A
    b. B
    c. C
    d. D
    Answer: c. C30dayscoding+2
  35. Which IP class would best fit an organization with approximately 60,000 devices?
    a. A
    b. B
    c. C
    d. D
    Answer: b. Bwikipedia+2
  36. The binary prefix for Class A IP addresses is:
    a. 0
    b. 10
    c. 110
    d. 1110
    Answer: a. 0tutorialspoint+1
  37. Which class is specifically assigned for use with multicast groups?
    a. Class B
    b. Class E
    c. Class D
    d. Class C
    Answer: c. Class Dtechtarget+1
  38. The first octet value for Class E addresses starts at:
    a. 224
    b. 240
    c. 128
    d. 1
    Answer: b. 240youstable+2
  39. What is true about the network portion in Class C IP addresses?
    a. Uses first 8 bits
    b. Uses first 16 bits
    c. Uses first 24 bits
    d. Uses first 4 bits
    Answer: c. Uses first 24 bitseukhost+2
  40. The total number of usable Class B networks is:
    a. 16,384
    b. 2,097,152
    c. 126
    d. 128
    Answer: a. 16,384wikipedia+2
  41. The class of an IP address with the binary starting 1110 is:
    a. Class A
    b. Class B
    c. Class D
    d. Class E
    Answer: c. Class Dtutorialspoint+1
  42. The purpose of Classful addressing originally was to:
    a. Allow only unicast communication
    b. Divide the IPv4 space for efficient allocation
    c. Provide address translation
    d. Encrypt communication
    Answer: b. Divide the IPv4 space for efficient allocationboardinfinity+2
  43. How many networks exist in Class C?
    a. 2,097,152
    b. 128
    c. 65,536
    d. 126
    Answer: a. 2,097,152youstable+2
  44. The address 10.0.0.5 is an example of:
    a. Class A private address
    b. Class B public address
    c. Class C loopback address
    d. Class D multicast address
    Answer: a. Class A private addressipstack+2
  45. Which network class includes addresses used for research and experimentation?
    a. Class A
    b. Class D
    c. Class E
    d. Class C
    Answer: c. Class Eeukhost+1
  46. The range 192.168.0.0 to 192.168.255.255 is regarded as:
    a. Public addresses
    b. Private Class C addresses
    c. Reserved for multicast
    d. Loopback addresses
    Answer: b. Private Class C addressesipstack+2
  47. The maximum number of hosts allowed in a Class C network is:
    a. 255
    b. 256
    c. 254
    d. 65,534
    Answer: c. 254wikipedia+2
  48. Which class uses the most bits for network addressing?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: c. Class C30dayscoding+2
  49. An address like 224.0.0.1 belongs to which class?
    a. Class C
    b. Class D
    c. Class A
    d. Class B
    Answer: b. Class Dtechtarget+1
  50. A company with 500 hosts should generally choose which class for efficient use of addresses?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: b. Class Byoustable+2

 

  1. https://en.wikipedia.org/wiki/Classful_network
  2. https://www.youstable.com/blog/ipv4-address-classes/
  3. https://www.eukhost.com/blog/webhosting/classes-of-ip-address/
  4. https://www.techtarget.com/searchnetworking/tip/Introduction-to-IP-addressing-and-subnetting
  5. https://www.tutorialspoint.com/what-are-the-classifications-of-classful-ip-addresses
  6. https://www.meridianoutpost.com/resources/articles/IP-classes.php
  7. https://www.geeksforgeeks.org/computer-networks/what-is-the-valid-range-of-a-class-a-network-address/
  8. https://study-ccna.com/classes-of-ip-addresses/
  9. https://ipstack.com/classes-of-private-ip-address
  10. https://30dayscoding.com/blog/understanding-classful-networks
  11. https://www.boardinfinity.com/blog/classful-addressing/
  12. https://www.auvik.com/franklyit/blog/classful-classless-addressing/
  13. https://www.geeksforgeeks.org/computer-networks/introduction-of-classful-ip-addressing/
  14. https://docs.oracle.com/cd/E19504-01/802-5753/planning3-78185/index.html
  15. https://www.youtube.com/watch?v=0dFNpNgiTAA
  16. https://www.geeksforgeeks.org/computer-networks/classful-vs-classless-addressing/
  17. https://www.cbtnuggets.com/blog/technology/networking/introduction-to-subnetting-what-is-a-network-class
  18. https://www.uhcl.edu/information-security/tips-best-practices/ipaddressing
  19. https://www.youtube.com/watch?v=uDRVo8otM7I
  20. https://en.wikipedia.org/wiki/IP_address
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