Identify the number of bits in an IPv4 address.
Mark scheme
- B 32 (1)
- The only correct answer is B. The correct answer is 32.
- A is not correct because 8 is the number of bits in one part of an IPv4 address, not the whole address
- C is not correct because 128 bits is the length of an IPv6 address
- D is not correct because 256 is the number of possible values in one 8-bit part of an IPv4 address
Example answers and how they were marked
Full marks1/1
B 32
Why: Correct option: an IPv4 address is 32 bits long (1).
No marks0/1
A 8
Why: Near miss: 8 is the number of bits in one part of an IPv4 address, not the whole address, so A is not credited.
No marks0/1
C 128
Why: Shows confusion between IPv4 and IPv6; 128 bits is the length of an IPv6 address, so C is not credited.