What is the address length of a Local route with a /32 mask?

A local route with a /32 mask is specified with an address that has a subnet mask of 255.255.255.255. This means that the entire address space of the IPv4 address is utilized for the network part, leaving no bits for the host part. In IPv4 addressing, an address consists of 32 bits.

When we specify a subnet mask of /32, we indicate that there is only one specific IP address in that network so effectively it designates a single host (device) in the network. Therefore, the address length, in this case, is 32 bits long, corresponding directly to how many bits are in an IPv4 address.

In the context of the provided options, the answer highlights the fundamental nature of IP addressing and subnetting in computer networks, particularly pertaining to how individual devices are identified on the network. A /32 is often used for loopback addresses or point-to-point links where only one device is referenced.