How many access control lists (ACLs) can be configured on a router that supports both IPv4 and IPv6?

A router that supports both IPv4 and IPv6 can have a variety of access control lists (ACLs) based on the different types of ACLs used for managing traffic. In general, a router supports different categories of ACLs for both IP versions.

For IPv4, you can configure:

1. Standard ACLs

2. Extended ACLs

For IPv6, the equivalent types of ACLs are:

1. Standard IPv6 ACLs

2. Extended IPv6 ACLs

Each of these categories can accommodate multiple individual ACLs, but the total associated with the configuration typically allows for more than just a couple.

In many cases, especially on various IOS versions, routers can support multiple instances of both standard and extended ACLs for both IPv4 and IPv6. The total comes to a higher number when accounting for the standard and extended types for both protocol versions.

Therefore, the correct answer reflects that a router capable of handling both IPv4 and IPv6 can indeed support a combined total of eight separate ACLs (two types for each IP version).