Hello aniket
The command area 1 nssa default-information originate will cause the router to advertise the default route that exists in its routing table. If the router does not have a default router in its routing table, it will not advertise itself as the next hop for a default route.
The command area 1 nssa default-information originate always will do the same thing except that it will advertise itself as a next hop router even if it doesn’t have a default route itself.
This is the case whether you are configuring this for an NSSA as in this lesson, or as a normal area.
Looking at the configs, there is no default route configured in R2 so in order to get the same results shown in the lesson, you are right that you must add the always keyword. Otherwise, a static default route should exist in the configuration of R2. I will let Rene know about this so it can be modified appropriately.
Thanks for pointing this out!
Laz