MCQs

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1. What does IPv4 stand for?
   a. Internet Protocol Version Four
   b. Internet Programming Variable Length
   c. Intra-Protocol Vector Layer Four
   d. Internal Packet Versioning Four
   Answer: a. Internet Protocol Version Fourletsfindcourse
2. How many bits are contained in an IPv4 address?
   a. 8
   b. 16
   c. 32
   d. 64
   Answer: c. 32testbook
3. What is the maximum value of any octet in an IPv4 address?
   a. 100
   b. 127
   c. 254
   d. 255
   Answer: d. 255testbook
4. Which of the following is NOT a valid IPv4 address?
   a. 192.168.1.1
   b. 10.0.0.256
   c. 172.16.0.5
   d. 203.0.113.99
   Answer: b. 10.0.0.256testbook
5. What is the default subnet mask for a Class B IPv4 address?
   a. 255.0.0.0
   b. 255.255.0.0
   c. 255.255.255.0
   d. 255.0.255.0
   Answer: b. 255.255.0.0testbook
6. Which IPv4 address class is used for multicast?
   a. Class A
   b. Class B
   c. Class C
   d. Class D
   Answer: d. Class Dtestbook
7. Which of the following fields in the IPv4 header is used to prevent packets from circulating indefinitely?
   a. Header Length
   b. Time to Live (TTL)
   c. Protocol
   d. Version
   Answer: b. Time to Live (TTL)sanfoundry
8. The minimum header size of an IPv4 packet is:
   a. 10 bytes
   b. 20 bytes
   c. 40 bytes
   d. 60 bytes
   Answer: b. 20 bytestestbook
9. In a Class C IPv4 address, how many bits are used for the host portion?
   a. 8
   b. 16
   c. 24
   d. 32
   Answer: a. 8testbook
10. What is the main purpose of the IP address assigned to a computer?
    a. To access emails
    b. To create documents
    c. To identify the device on a network
    d. To increase speed
    Answer: c. To identify the device on a networktestbook
11. How many octets are there in an IPv4 address?
    a. 2
    b. 3
    c. 4
    d. 8
    Answer: c. 4testbook
12. Which of the following is NOT related to fragmentation in the IPv4 header?
    a. Flags
    b. Fragment Offset
    c. Type of Service (TOS)
    d. Identification
    Answer: c. Type of Service (TOS)sanfoundry
13. What notation is used to represent IPv4 addresses?
    a. Binary
    b. Dotted decimal
    c. Hexadecimal
    d. Octal
    Answer: b. Dotted decimalletsfindcourse
14. Which of these is a loopback IPv4 address?
    a. 127.0.0.1
    b. 0.0.0.0
    c. 192.168.0.1
    d. 224.0.0.1
    Answer: a. 127.0.0.1letsfindcourse
15. How many total IPv4 addresses are theoretically possible?
    a. 16,777,216
    b. 65,536
    c. 4,294,967,296
    d. 2,147,483,648
    Answer: c. 4,294,967,296testbook
16. For which class is the IP address range 128.0.0.0 to 191.255.255.255?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: b. Class Btestbook
17. What is the purpose of a broadcast address in IPv4?
    a. To send a message to all hosts on a network
    b. To send a message to one host
    c. To identify routers
    d. To assign loopback addresses
    Answer: a. To send a message to all hosts on a networkletsfindcourse
18. In CIDR, what does the suffix “/24” signify in the address 192.168.10.0/24?
    a. 24 hosts
    b. 24 networks
    c. 24 bits are used for the network portion
    d. 24 subnets
    Answer: c. 24 bits are used for the network portionletsfindcourse
19. Which field in an IPv4 header is used for differentiating service types?
    a. Time to Live
    b. Identification
    c. Type of Service (TOS)
    d. Protocol
    Answer: c. Type of Service (TOS)sanfoundry
20. Which IPv4 class consists of addresses from 192.0.0.0 to 223.255.255.255?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: c. Class Ctestbook
21. What does NAT stand for in IPv4 networking?
    a. Network Access Translation
    b. Network Address Translation
    c. Network Area Transformation
    d. Node Addressing Type
    Answer: b. Network Address Translationtestbook
22. When subnetting a Class C network, how many hosts are available per subnet with a subnet mask of 255.255.255.240?
    a. 14
    b. 16
    c. 30
    d. 254
    Answer: a. 14testbook
23. The IPv4 address 255.255.255.255 is known as the:
    a. Limited broadcast address
    b. Multicast address
    c. Loopback address
    d. Anycast address
    Answer: a. Limited broadcast addresstestbook
24. Which layer of the OSI model does IPv4 primarily operate on?
    a. Physical
    b. Data Link
    c. Network
    d. Transport
    Answer: c. Networkletsfindcourse
25. What is the main difference between IPv4 and IPv6?
    a. IPv4 uses 32-bit addresses; IPv6 uses 128-bit addresses
    b. IPv4 is encrypted; IPv6 is not
    c. IPv4 is for private networks only
    d. IPv6 does not support multicasting
    Answer: a. IPv4 uses 32-bit addresses; IPv6 uses 128-bit addressessanfoundry
26. An IPv4 packet is considered invalid if the header length indicates less than how many bytes?
    a. 10 bytes
    b. 16 bytes
    c. 20 bytes
    d. 32 bytes
    Answer: c. 20 bytestestbook
27. What field in the IPv4 header identifies the upper-layer protocol?
    a. Flags
    b. Total Length
    c. Protocol
    d. Header Checksum
    Answer: c. Protocolsanfoundry
28. Which IPv4 address is reserved for private network and not routable over the Internet?
    a. 192.0.2.1
    b. 10.0.0.1
    c. 203.0.113.2
    d. 8.8.8.8
    Answer: b. 10.0.0.1testbook
29. How many possible network IDs can a Class A IPv4 address have?
    a. 127
    b. 126
    c. 128
    d. 255
    Answer: b. 126 (excluding 0 and 127)testbook
30. The main responsibility of ARP (Address Resolution Protocol) is:
    a. Assigning IP addresses automatically
    b. Resolving domain names
    c. Mapping IP addresses to MAC addresses
    d. Routing packets
    Answer: c. Mapping IP addresses to MAC addressesletsfindcourse
31. What does ICMP provide in IPv4 network operations?
    a. Error reporting and diagnostics
    b. Encryption
    c. IP addressing
    d. Network congestion control
    Answer: a. Error reporting and diagnosticssanfoundry
32. What is the purpose of the “Identification” field in the IPv4 header?
    a. Identify the type of protocol
    b. Identify fragment datagrams for reassembly
    c. Identify network address class
    d. Identify multicast groups
    Answer: b. Identify fragment datagrams for reassemblysanfoundry
33. A broadcast address for a network 10.0.0.0/8 is:
    a. 10.0.0.0
    b. 10.255.255.255
    c. 255.255.255.255
    d. 0.0.0.0
    Answer: b. 10.255.255.255testbook
34. Which one of the following is used to split and join IP datagrams?
    a. Routing
    b. Fragmentation and reassembly
    c. Filtering
    d. Address mapping
    Answer: b. Fragmentation and reassemblysanfoundry
35. What is the maximum size of a standard IPv4 packet including header and data?
    a. 576 bytes
    b. 1024 bytes
    c. 1480 bytes
    d. 65535 bytes
    Answer: d. 65535 bytestestbook
36. In classful addressing, which class provides the most available host addresses per network?
    a. Class A
    b. Class B
    c. Class C
    d. Class D
    Answer: a. Class Atestbook
37. Which of the following is NOT a benefit of using IPv4 NAT?
    a. Prevents private address conflicts
    b. Enables direct end-to-end connectivity over the global Internet
    c. Allows multiple devices to share a public IP
    d. Helps conserve public IP address space
    Answer: b. Enables direct end-to-end connectivity over the global Internettestbook
38. How many bits are available for host addresses in a Class B network?
    a. 8
    b. 16
    c. 24
    d. 32
    Answer: b. 16testbook
39. What does the “Fragment Offset” field in IPv4 indicate?
    a. Network ID
    b. Fragment location in original datagram
    c. Encapsulation protocol
    d. Sequence number of packet
    Answer: b. Fragment location in original datagramsanfoundry
40. Which IPv4 header field helps request special packet handling, such as low delay or high reliability?
    a. Version
    b. Flags
    c. Type of Service
    d. Header Length
    Answer: c. Type of Servicesanfoundry
41. Which is NOT a private IPv4 address block?
    a. 10.0.0.0/8
    b. 172.16.0.0/12
    c. 192.168.0.0/16
    d. 100.64.0.0/10
    Answer: d. 100.64.0.0/10testbook
42. Which is the valid network mask for a network with 8 host addresses?
    a. 255.255.255.0
    b. 255.255.255.224
    c. 255.255.255.248
    d. 255.255.255.252
    Answer: c. 255.255.255.248testbook
43. An IPv4 header checksum is used to:
    a. Check the integrity of the header
    b. Encrypt packet data
    c. Verify the destination MAC address
    d. Define TCP segment length
    Answer: a. Check the integrity of the headersanfoundry
44. A subnet mask of 255.255.255.128 provides how many host addresses?
    a. 126
    b. 128
    c. 254
    d. 512
    Answer: a. 126testbook
45. What maximum number of hosts can be addressed on a single Class C network?
    a. 254
    b. 255
    c. 256
    d. 1024
    Answer: a. 254testbook
46. IPv4 packets are best described as:
    a. Connection-oriented
    b. Connectionless
    c. Synchronous only
    d. Reliable data streams
    Answer: b. Connectionlessletsfindcourse
47. The highest value allowed for the TTL field in IPv4 is:
    a. 64
    b. 99
    c. 127
    d. 255
    Answer: d. 255sanfoundry
48. What kind of address is 224.0.0.1 in IPv4?
    a. Broadcast
    b. Multicast
    c. Private
    d. Loopback
    Answer: b. Multicasttestbook
49. What will happen if an IPv4 packet’s TTL field reaches zero?
    a. Packet is forwarded
    b. Packet is dropped
    c. Packet is returned to sender
    d. Packet is corrupted
    Answer: b. Packet is droppedsanfoundry
50. Which of the following is NOT a valid subnet mask?
    a. 255.0.0.0
    b. 255.255.0.0
    c. 255.255.254.0
    d. 255.0.255.0
    Answer: d. 255.0.255.0testbook

1. https://letsfindcourse.com/computer-network-mcq/ipv4-mcq-questions-and-answers
2. https://testbook.com/objective-questions/mcq-on-ipv4–5eea6a0939140f30f369d912
3. https://www.sanfoundry.com/computer-networks-mcqs-ipv4/
4. https://www.sanfoundry.com/computer-networks-questions-answers-ipv4-ipv6-comparison/
5. https://www.scribd.com/document/668872484/IP-Address-solved-MCQs-with-answers-in-PDF
6. https://erp.metbhujbalknowledgecity.ac.in/StudyMaterial/01VD062009003760041.pdf
7. https://www.interviewbit.com/computer-network-mcq/
8. https://www.geeksforgeeks.org/quizzes/ip-addressing-57/
9. https://testbook.com/objective-questions/mcq-on-ipv4ipv6-routers-and-routing-algorithms–5eea6a0939140f30f369d911
10. https://prepp.in/computer-networks-questions?topicIds=63794bda0e7166770da9f98e
11. https://networkhope.in/quiz-on-classful-ip-address-part-2/
12. https://letsfindcourse.com/computer-network-mcq/addressing-mcq-questions-and-answers
13. https://reck.ac.in/wp-content/uploads/2023/04/DCN_MCQ-Ashwini-.pdf
14. https://www.youtube.com/watch?v=W6hN70j5kGI
15. https://edurev.in/test/5858/Test-Ipv4–IP-Packet