In terms of data transmission efficiency, which method is recommended for networks with multiple subnets?

Using single links to carry multiple subnets is the recommended method for enhancing data transmission efficiency in networks that have multiple subnets. This approach allows for the consolidation of network resources, reducing complexity and the physical amount of infrastructure required. By employing techniques such as VLANs (Virtual Local Area Networks) or subnetting over a common link, you can efficiently manage traffic and minimize the chances of collisions, which leads to improved overall performance.

Additionally, this method streamlines the network design and reduces costs associated with deploying and maintaining separate cables for each subnet. Single links can also utilize multiplexing techniques to maintain high throughput by allowing multiple data streams to traverse a single physical medium, thus optimizing the use of available bandwidth while still ensuring effective communication between the subnets.

In contrast, using separate cables for each subnet would significantly increase infrastructure complexity and cost. Implementing static routes for each subnet can manage routing but does not inherently improve data transmission efficiency as consolidating multiple subnets onto a single link does. Similarly, using a mesh topology is more suited for situations where high redundancy and fault tolerance are priority rather than merely focusing on efficiency in data transmission.