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Question

Difficulty: EasyIPv4 Addressing and Subnetting

A network administrator needs to assign a single usable IPv4 host address to a server connected to the 192.168.1.16/28 subnet. Which of the following IPv4 addresses is a valid usable host address for this subnet?

  1. A
    192.168.1.16
  2. 192.168.1.25Answer
  3. C
    192.168.1.31
  4. D
    192.168.1.32

Answer

The address 192.168.1.25 is a valid usable host address.
For the network block 192.168.1.16/28, the subnet range begins at the network address 192.168.1.16 and ends at the broadcast address 192.168.1.31. Consequently, the assignable usable host address range spans from 192.168.1.17 through 192.168.1.30. The address 192.168.1.25 falls directly within this valid range.

Step-by-Step Solution

1
Determine the block size from the prefix length.
A /28 prefix uses a subnet mask of 255.255.255.240. The block size is 256 - 240 = 16.
Calculating the block size identifies the increments between adjacent subnets.
2
Identify the network address and broadcast address for the subnet.
Network address is 192.168.1.16. Broadcast address is 192.168.1.31 (16 + 16 - 1).
The network address is the start of the subnet block, and the broadcast address is the last address in the block.
3
Determine the range of usable host addresses.
Usable host addresses range from 192.168.1.17 to 192.168.1.30.
Usable host IPs exclude both the network address and the broadcast address.

Key Concept

IPv4 Subnet Boundaries and Usable Host Identification
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Topics

IPv4 Addressing and Subnetting

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