Review your OSPF Understanding - Juniper Networking

Questions:

Answers:

1.OSPF routers use LSAs to share information about their attached networks with other neighboring OSPF routers.

2.You can restrict the size of an OSPF router’s LSDB by incorporating multiple areas. In some types of OSPF areas, such asstub, totally stubby, and NSSA areas, only certain types of LSAs are flooded.

3.ABRs connect nonbackbone areas to the backbone area and ASBRs inject external prefixes into OSPF using redistributionpolicy. Note that an OSPF router can be an ABR and an ASBR simultaneously.

4.There are several types of OSPF areas such as stub, totally stubby, and NSSA areas. Stub areas do not carry external routes and cannot contain ASBRs. Totally stubby areas are stub areas that do not receive summary LSAs from the backbone but ratherreceive a single LSA that represents a default route. NSSA areas allow external routes to be advertised from the area but notreceived from another area. It is also worth mentioning the backbone area (Area 0.0.0.0) to which all other areas connect.