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CCNA Routing & Switching : OSPF areas concept

As discussed in Chapter 4, "Introduction to OSPF," there is a variety of RFCs that deal with OSPF. By now, you should be familiar with the many different features available within the OSPF protocol. But which RFCs does Cisco support within its products? RFC 1253: Open Shortest Path First (OSPF) MIB. This RFC contains the information, which provides management information relating to OSPF. RFC 1583: OSPF Version 2. Cisco's implementation conforms to the specifications as detailed in this RFC. They support the following key features: stub areas, route redistribution, authentication (covered later), tunable interface parameters, and virtual links. RFC 1587: Not-So-Stubby-Areas (NSSA). Cisco equipment supports the use of all types of stub areas. RFC 1793: OSPF over Demand Circuits. Cisco supports this RFC as well. Network Design Goals It is not necessary to get into the reasons behind your decision to build an OSPF network or any of the previously covered definitions of what a network is. However, the five basic goals that you should keep in mind while designing your OSPF network (or any network for that matter) should be adhered to: Functionality Scalability Adaptability Manageability Cost effectiveness