OSPF Stub Areas

While using eNSP, I should have good habit to label area and IP address.
With this lab test, I have learnt two things.
One is to configure Router ID as loopback IP address while configuring OSPF.
The other is that stub area is used for blocking routes outside of AS, not outside of area. If I use stub no-summary, then I’ll make the stub area totally stub area for it can block routes outside of area.
