Folks, the task says to passive any interface that don't have routers attached, however into solutions guide documente, I don't see passive interface loopback0. So int this case loopback0 is (no passive)
In the other hand, the next sub-task int this 5.19 task, says to put default-interface default all interfaces and no passive-interface only those that have connecter routers. In this case loopback0 remains (passive)
So what's the correct answer for loopback 0 passive or no passive?
educho