What percentage (%) of the IPv4, IP address space do all class C addresses…
2019
What percentage (%) of the IPv4, IP address space do all class C addresses consume?
- A.
12.5%
- B.
25%
- C.
37.5%
- D.
50%
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Show answer & explanation
Correct answer: A
Answer: 12.5%
Explanation: Total IPv4 address count is 2^32. Class C addresses are identified by the leading bit pattern "110", which fixes 3 bits, leaving 32 - 3 = 29 bits that can vary.
Number of class C addresses = 2^29. Percentage = 2^29 / 2^32 = 1/8 = 12.5%.
Class A: 2^31/2^32 = 50%
Class B: 2^30/2^32 = 25%
Class C: 2^29/2^32 = 12.5%
Class D and E: remaining fractions (each 6.25%)
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