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Difficulty: MediumIPv4 Addressing and Subnetting

A network administrator is assigning static IP addresses to newly deployed hypervisor hosts within the assigned IPv4 subnet block 172.16.48.0/22172.16.48.0/22. Which of the following IPv4 addresses represent valid, assignable host addresses on this network? (Select TWO.)

  1. 172.16.48.1172.16.48.1Answer
  2. B
    172.16.48.0172.16.48.0
  3. 172.16.51.200172.16.51.200Answer
  4. D
    172.16.51.255172.16.51.255

Answer

The addresses 172.16.48.1 and 172.16.51.200 are valid, usable host IPv4 addresses on the 172.16.48.0/22 subnet.
The CIDR block 172.16.48.0/22 provides a usable host range of 172.16.48.1 through 172.16.51.254. The addresses 172.16.48.1 and 172.16.51.200 both fall within this valid range and can be assigned to host interfaces.

Step-by-Step Solution

1
Determine the subnet mask and block size for a CIDR prefix of /22.
A /22 prefix corresponds to a subnet mask of 255.255.252.0. The third octet block size is 256 - 252 = 4.
Calculating the block size in the third octet establishes the boundary increments for subnet networks.
2
Calculate the network address and broadcast address boundaries for the subnet.
The network address is 172.16.48.0. The next subnet boundary begins at 172.16.52.0, making the broadcast address 172.16.51.255.
Network boundaries define the first address (network ID) and last address (broadcast ID) of the subnet block.
3
Identify the range of usable host IP addresses.
The range of usable host addresses spans from 172.16.48.1 (first usable) to 172.16.51.254 (last usable).
Usable host addresses exclude the network ID and broadcast ID.
4
Evaluate each candidate address against the usable host range.
172.16.48.1 and 172.16.51.200 fall strictly within the usable range (172.16.48.1 to 172.16.51.254), while 172.16.48.0 (network ID) and 172.16.51.255 (broadcast ID) are reserved and invalid for host assignment.
Host assignment requires selecting IP addresses strictly inside the usable range.

Key Concept

Determining Usable Host Ranges in IPv4 Subnetting
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Topics

IPv4 Addressing and Subnetting

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