At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?

By default, if IS-IS is enabled on all routers, and this is an IPv6 network, what path is taken?

An engineer is designing a multicast network for a financial application Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better routing tables, the design must not use source trees.
Which multicast protocol satisfies these requirements?

Which method does Cisco SD-WAN use to avoid fragmentation issues?

How many host addresses are available with a Class B network with the default mask?