Which of the following is a benefit of using subnetting in networks?

Using subnetting in networks offers improved security and reduced broadcast domains. By dividing a larger network into smaller, more manageable subnets, the overall network can have controlled communication between different groups of devices. This segmentation enhances security because traffic can be limited within subnets, reducing the risk of unauthorized access and data breaches. In addition, by reducing the size of broadcast domains, the amount of broadcast traffic on the network diminishes significantly, leading to better overall performance and efficiency.

The other options do not accurately reflect the benefits of subnetting; for instance, subnetting does not inherently increase complexity in design, nor does it slow down routing processes. Rather, it allows for more efficient routing by isolating traffic. Moreover, while subnetting can help manage address spaces more effectively, it does not completely eliminate IP address wastage, especially if subnets are not properly planned or defined.