Summary Table: Chapter 9 Command Review
| Command | Description |
|---|---|
| area area-id authentication[message-digest] | Enables type 1 or type 2 authentication for an area. |
| area area-id default-cost cost | Specifies a cost for the default route sent into a stub area by an ABR. |
| area area-id nssa [no-redistribution][default-information-originate][no-summary] | Configures an area as not-so-stubby (NSSA). |
| area area-id range address mask | Summarizes addresses into or out of an area. |
| area area-id stub [no-summary] | Configures an area as a stub or totally stubby area. |
| area area-id virtual-link router-id | Defines a virtual link between ABRs. |
| debug ip ospf adj | Shows the events involved in the building or breaking of an OSPF adjacency. |
| ip ospf authentication-key ... |
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