MCQ

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📌 Section A – Basics of IP, IPv4 & IPv6

Q1. An IP address is used for which purpose?
a) To log in to email
b) To identify a device on a network
c) To store files
d) To format a disk

b

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Q2. How many bits are there in an IPv4 address?
a) 16
b) 32
c) 64
d) 128

b

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Q3. How many bits are there in an IPv6 address?
a) 64
b) 32
c) 128
d) 256

c

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Q4. IPv4 addresses are usually written in:
a) Hexadecimal format with colons
b) Decimal format with dots
c) Binary format with commas
d) Hexadecimal format with dots

b

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Q5. IPv6 addresses are usually written in:
a) Dotted decimal
b) Hexadecimal with colons
c) Octal with colons
d) Binary with dots

b

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Q6. Which of the following is not a valid IPv4 address?
a) 192.168.10.5
b) 10.0.0.256
c) 172.16.0.1
d) 8.8.8.8

d – An IPv4 address is composed of four numbers (called octets) separated by periods. Each number must be between $0$ and $255$.

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Q7. The total number of addresses available in IPv4 is approximately:
a) 4.3 million
b) 4.3 billion
c) 43 billion
d) 4.3 trillion

b

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Q8. IPv6 was introduced mainly to:
a) Increase security only
b) Increase speed only
c) Overcome IPv4 address exhaustion
d) Remove routers from the Internet

c

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📌 Section B – IPv4 Addressing, Classes & Special Ranges

Q9. An IPv4 address is divided into:
a) Network ID and Port ID
b) Host ID and MAC ID
c) Network ID and Host ID
d) Source ID and Destination ID

c

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Q10. How many octets are there in an IPv4 address?
a) 2
b) 4
c) 6
d) 8

b

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Q11. Class A IPv4 addresses have the first octet in the range:
a) 0–63
b) 1–126
c) 128–191
d) 192–223

b

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Q12. Class B IPv4 addresses have the first octet in the range:
a) 1–126
b) 128–191
c) 192–223
d) 224–239

b

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Q13. Class C IPv4 addresses have the first octet in the range:
a) 1–126
b) 128–191
c) 192–223
d) 224–239

c

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Q14. Which class is used for multicast in IPv4?
a) Class A
b) Class B
c) Class C
d) Class D

d

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Q15. Which class is reserved for experimental use in IPv4?
a) Class A
b) Class C
c) Class D
d) Class E

d

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Q16. Which of the following is a Class A address?
a) 10.1.2.3
b) 130.10.1.1
c) 200.1.1.1
d) 230.1.1.1

a

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Q17. Which of the following is a Class C address?
a) 15.0.0.1
b) 172.20.1.1
c) 192.168.1.1
d) 224.10.10.10

c

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Q18. The loopback address in IPv4 generally used for testing is:
a) 0.0.0.0
b) 127.0.0.1
c) 255.255.255.255
d) 169.254.0.1

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Q19. The range 127.0.0.0 – 127.255.255.255 in IPv4 is reserved for: larus.net+1
a) Private addressing
b) Broadcasting
c) Loopback/testing
d) Multicasting

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Q20. The IPv4 address 0.0.0.0 represents:
a) Default route
b) Current network / “this host”
c) Loopback
d) Broadcast

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Q21. The IPv4 address 255.255.255.255 is used for: Wikipedia
a) Limited broadcast
b) Loopback
c) Private network
d) Multicast

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Q22. Automatic Private IP Addressing (APIPA) range in IPv4 is: Wikipedia
a) 10.0.0.0 – 10.255.255.255
b) 169.254.0.0 – 169.254.255.255
c) 172.16.0.0 – 172.31.255.255
d) 192.168.0.0 – 192.168.255.255

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Q23. Which of the following is NOT a private IPv4 range (as per RFC 1918)? Wikipedia
a) 10.0.0.0/8
b) 172.16.0.0/12
c) 192.168.0.0/16
d) 11.0.0.0/8

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Q24. 192.168.1.0/24 belongs to which IPv4 class (by first octet)?
a) Class A
b) Class B
c) Class C
d) Class D

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Q25. Which is the correct default subnet mask for a Class C network?
a) 255.0.0.0
b) 255.255.0.0
c) 255.255.255.0
d) 255.255.255.255

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Q26. Which of these subnet masks corresponds to /26 in IPv4? Testbook
a) 255.255.255.0
b) 255.255.255.128
c) 255.255.255.192
d) 255.255.255.224

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Q27. In a /24 IPv4 network, how many usable host addresses are available?
a) 254
b) 256
c) 252
d) 128

Total addresses = 2(32−24)=28=2562^{(32-24)} = 2^8 = 2562(32−24)=28=256
Minus:

• 1 network address
• 1 broadcast address

So, usable = 256 − 2 = 254

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📌 Section C – IPv6 Addressing & Types

Q28. How many hexadecimal groups are there in a full IPv6 address?
a) 4 groups
b) 6 groups
c) 8 groups
d) 16 groups

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Q29. The “::” symbol in IPv6 is used to:
a) Show loopback address
b) Compress one sequence of consecutive zeros
c) Indicate subnet ID
d) Indicate broadcast

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Q30. Which of the following is a valid compressed IPv6 address?
a) 2001:::1
b) 2001:0db8::1
c) 2001::0db8::1
d) 2001:db8:0:0:0:0:0:0:1

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Q31. The IPv6 loopback address is: Wikipedia
a) ::
b) ::1
c) fe80::1
d) ::ffff

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Q32. Which prefix represents IPv6 link-local addresses? Wikipedia+1
a) fc00::/7
b) 2000::/3
c) fe80::/10
d) ff00::/8

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Q33. Which prefix represents IPv6 global unicast addresses? AWS Documentation
a) 2000::/3
b) fe80::/10
c) ff00::/8
d) fc00::/7

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Q34. Which prefix is used for IPv6 unique local addresses (similar to IPv4 private)? IPCisco+1
a) 2000::/3
b) fc00::/7
c) fe80::/10
d) ff00::/8

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Q35. IPv6 multicast addresses start with: Network Academy+1
a) 2000::/3
b) fe80::/10
c) ff00::/8
d) fc00::/7

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Q36. In IPv6, which of the following is true?
a) Broadcast addressing is used
b) Broadcast is replaced by multicast
c) IPv6 has only private addresses
d) IPv6 uses 32-bit addresses

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Q37. Which type of address in IPv6 is delivered to one of many possible devices (nearest one)?
a) Unicast
b) Anycast
c) Multicast
d) Broadcast

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Q38. In a standard IPv6 unicast address, the interface ID (host part) is typically: Wikipedia
a) 16 bits
b) 32 bits
c) 48 bits
d) 64 bits

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📌 Section D – IPv4 vs IPv6, Transition

Q39. Compared to IPv4, IPv6 uses how many times more bits for addressing? IncludeHelp+1
a) 2 times
b) 4 times
c) 6 times
d) 8 times

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Q40. Which statement is correct about IPv4 & IPv6? Filo+1
a) IPv4 has more bits than IPv6
b) IPv4 and IPv6 both use 32 bits
c) IPv4 uses fewer bits than IPv6
d) IPv4 uses 64 bits, IPv6 uses 128 bits

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Q41. Which of the following is true about IPv6 vs IPv4?
a) IPv6 supports built-in IPsec; IPv4 does not by default
b) IPv6 uses NAT widely; IPv4 does not
c) IPv6 has fewer addresses than IPv4
d) IPv6 still uses broadcast

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Q42. Which technology allows a device to run both IPv4 and IPv6 at the same time? Sanfoundry+1
a) NAT64
b) Dual-stack
c) Tunneling
d) Subnetting

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Q43. Sending IPv6 packets inside IPv4 packets to cross an IPv4 network is called: Sanfoundry
a) Dual-stack
b) Tunneling
c) Translation
d) Encapsulation not allowed

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Q44. Translating traffic between IPv6-only and IPv4-only networks (e.g., using NAT64) is called: Wikipedia
a) Dual-stack
b) Tunneling
c) Translation
d) Fragmentation

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Q45. Which of the following is NOT a difference between IPv4 and IPv6?
a) Address length
b) Notation format
c) Existence of broadcast
d) Use of TCP as a transport protocol

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📌 Section E – Subnetting & Practical Questions

Q46. In IPv4, the notation “/24” in 192.168.10.0/24 indicates: Wikipedia+1
a) 24 host bits
b) 24 network bits
c) 24 bytes
d) 24 subnets

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Q47. Which of the following is the network address of the host 192.168.5.130/24?
a) 192.168.5.0
b) 192.168.5.128
c) 192.168.5.255
d) 192.168.0.0

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Q48. In IPv4, how many host addresses are available in a /30 network (excluding network & broadcast)?
a) 2
b) 4
c) 6
d) 8

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Q49. Which of the following IPv6 addresses looks like a link-local address assigned automatically to an interface? Wikipedia+1
a) 2001:db8::1
b) fe80::1a2b:3c4d:0001
c) fc00::1
d) ff02::1

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Q50. Which of the following IPv6 addresses is most likely a multicast address? Network Academy+1
a) 2001:db8::1
b) fe80::2
c) fc00::abcd
d) ff02::1

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