220-801 · Question #175
Which of the following is the MAXIMUM number of unique IP addresses on an IPv4 Class A network?
The correct answer is C. 16.3 Million. A single IPv4 Class A network uses 8 bits for the network portion and 24 bits for hosts, yielding 2^24 minus 2 usable addresses, which is approximately 16.7 million - closest to 16.3 million among the choices.
Question
Which of the following is the MAXIMUM number of unique IP addresses on an IPv4 Class A network?
Options
- A254
- B65 Thousand
- C16.3 Million
- D340 Trillion
How the community answered
(27 responses)- A4% (1)
- C93% (25)
- D4% (1)
Why each option
A single IPv4 Class A network uses 8 bits for the network portion and 24 bits for hosts, yielding 2^24 minus 2 usable addresses, which is approximately 16.7 million - closest to 16.3 million among the choices.
254 usable addresses describes a single Class C network (/24), which has only 8 host bits.
Approximately 65,000 addresses (2^16) describes a Class B network, which uses 16 bits for host addressing.
IPv4 Class A networks reserve the first octet (8 bits) for the network identifier, leaving 24 bits for host addresses. 2^24 equals 16,777,216 total addresses, minus the network and broadcast addresses gives approximately 16.7 million usable hosts, which the answer set approximates as 16.3 million.
340 trillion is an approximation associated with IPv6 address space, not IPv4 Class A.
Concept tested: IPv4 Class A network host address capacity
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/tcpip-addressing-and-subnetting
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