The characteristic of diverse OSPF area types

[Chris]

Probably because I rarely use it, I find that OSPF concepts leave my memory faster than they come in.
Can anyone help me summarize the characteristic of OSPF area types ?

[David.C]

http://www.netbraintech.com/share/ospfareatypes_reply.gif

Stub Area -
1. Doesn't accept External routes
2. Inserts an OSPF Default route
3. Routes seen - O, O IA , O* IA
Totally Stub Area -
1. Doesn't accept External or Inter Area routes
2. Inserts a default route
3. Routes seen - O, O* IA
NSSA -
1. The area adjacent to two different AS
2. Converts external routes (OE1/E2) LSA5 to (ON1/N2) LSA7
3. Doesn't accept Inter Area
4. Inserts a Default Route
5. Routes seen - O, O* IA , O N1/N2