Answer: The subnetting of a network with a /31 prefix length is not possible due to the limited number of available host addresses.

Below are the reasons why we cannot subnet a network with a /31 prefix length

Limited Host Addresses

The /31 subnet Has only the two usable host addresses, due to the binary nature of subnet masks. Because of this limitation it makes difficult to connect various devices within the same subnet.

Inefficient Use of IP Addresses

The /31 subnet for the larger networks mainly wastes the IP addresses as each of the subnet can only consists of two devices.

Scalability Issue

The subnetting with the /31 prefix limits the scalability of the network since it not allow the sufficient growth in the number of devices that are connected within a subnet.

Management Complexity

Managing the network with /31 subnets is difficult and complex when working with routing tables and the addressing schemes.

Deployment Issue

The /31 subnets are mainly uses in the point-to-point links where there are only two devices to communicate. Using them in the larger network segements is not feasible and leads to the ineffiently in network management and resource allocation.