An IPv4 address is written as four groups of numbers.
Identify the valid IPv4 address.
Mark scheme
- B 192.168.0.1 (1)
- The only correct answer is B. The correct answer is 192.168.0.1.
- A is not correct because it has only three groups of numbers; an IPv4 address has four groups separated by dots
- C is not correct because it has five groups of numbers; an IPv4 address has four groups separated by dots
- D is not correct because 256 is outside the valid range for a group, which is 0 to 255
Example answers and how they were marked
Full marks1/1
B 192.168.0.1
Why: Correct option: four groups of numbers, each from 0 to 255, separated by dots (1).
No marks0/1
A 192.168.0
Why: Near miss: only three groups of numbers are shown, so it is not a valid IPv4 address; A is not credited.
No marks0/1
D 192.168.0.1.256
Why: Shows the misconception that a group can be 256; the rule is each group must be 0 to 255, so D is not credited.