What statement is true about the longer route-filter match type?

A longer route-filter match type is fundamentally designed to match routes that are more specific than a given prefix. Specifically, this means that it will match any routes that have a longer prefix (more bits in the subnet mask). When you define a filter using a longer prefix, you effectively say, "I want to see all the more specific routes that fall under this broader network."

In contrast to the other statements, which imply different matching criteria, the premise of longer prefixes in a routing context inherently indicates that these are more specific routes. Therefore, all routes that are longer than the specified prefix will match. The reason this statement is accurate is that routing decisions are often made based on the specificity of route prefixes, and a longer prefix (for example, /24 instead of /16) signifies a more granular selection of routes within that address space.

This matching behavior is crucial for route filtering in networking, as it helps in the management of routing tables by determining which routes to accept, reject, or use based on their specificity.