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Difficulty: EasyIPv4 Addressing and Subnetting

A network administrator is assigning IPv4 addresses to host interfaces within the 10.50.12.0/2610.50.12.0/26 subnet. Which of the following IPv4 addresses are valid usable host addresses on this subnet?

  1. 10.50.12.110.50.12.1Answer
  2. 10.50.12.5010.50.12.50Answer
  3. C
    10.50.12.010.50.12.0
  4. D
    10.50.12.6310.50.12.63

Answer

The addresses 10.50.12.110.50.12.1 and 10.50.12.5010.50.12.50 are valid usable host addresses on the 10.50.12.0/2610.50.12.0/26 subnet.
For a /26/26 prefix, 6 host bits yield 64 total IP addresses. With a network address of 10.50.12.010.50.12.0, the subnet broadcast address is 10.50.12.6310.50.12.63. The valid usable host range spans from 10.50.12.110.50.12.1 to 10.50.12.6210.50.12.62. Therefore, 10.50.12.110.50.12.1 and 10.50.12.5010.50.12.50 are valid host addresses.

Step-by-Step Solution

1
Determine the subnet size from the CIDR prefix.
A /26/26 prefix leaves 32−26=632 - 26 = 6 host bits. The total block size is 26=642^6 = 64 addresses.
Host bits determine the size of the IP block for a given prefix.
2
Identify the network address and broadcast address for the subnet.
The network address is 10.50.12.010.50.12.0. The broadcast address is 10.50.12.6310.50.12.63 (0+64−10 + 64 - 1).
The first address in a block is reserved for the network ID, and the last address is reserved for the broadcast ID.
3
Calculate the usable host address range.
The usable host address range is 10.50.12.110.50.12.1 through 10.50.12.6210.50.12.62.
Usable host addresses exclude both the network ID and the broadcast ID (2n−22^n - 2).
4
Evaluate the given choices against the usable host range.
10.50.12.110.50.12.1 and 10.50.12.5010.50.12.50 fall within the [10.50.12.1,10.50.12.62][10.50.12.1, 10.50.12.62] range, while 10.50.12.010.50.12.0 is the network ID and 10.50.12.6310.50.12.63 is the broadcast ID.
Only addresses inside the calculated usable host range can be assigned to host interfaces.

Key Concept

Subnet Host Range Calculation
Estimated Time:45s
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Topics

IPv4 Addressing and Subnetting

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