When supporting a protocol, we may put the protocol entity into the kernel or a daemon process. What are the considerations here? That is, when will you put it into the kernel and a daemon,...

When supporting a protocol, we may put the protocol entity into the kernel or a daemon process. What are the considerations here? That is, when will you put it into the kernel and a daemon, respectively?

In Figure 1.13 , why do we put the routing task as a daemon in the user space while keeping the routing table lookup in the kernel? Why not put both in the user space or the kernel?