A prefix-list can filter based on which of the following criteria?

A prefix-list is a powerful tool employed in routing within Cisco environments, specifically designed to manage the filtering of routing updates. It operates by assessing routes based on their prefixes and prefix lengths.

When creating a prefix-list, the focus is on specifying certain network addresses along with their respective subnet masks. This allows for filtering of routes to ensure that only those that meet the specified criteria are either permitted or denied from the routing protocol updates. The prefix length effectively defines the size of the network being filtered, enabling network administrators to maintain greater control over which routes are considered for use in routing tables.

Thus, the use of prefix and prefix length is integral in determining how routing policies are applied and what routes will be accepted or rejected in the network's routing processes. This mechanism is key in optimizing routing efficiency and can significantly enhance decision-making in the forwarding of network packets.