Chapter 9 - Advanced OSPF

Question 1

area border router (ABR)

Answer 1

A router that connects an OSPF area to Area 0 (that is the backbone area).

Question 2

backbone area

Answer 2

The OSPF Area 0 which connects to all other OSPF areas. The backbone area is the only area that should provide connectivity between all other OSPF areas.

Question 3

discontiguous network

Answer 3

An OSPF network where Area 0 is not contiguous and generally results in routes not being advertised pervasively through the OSPF routing domain.

Question 4

interarea route

Answer 4

An OSPF route learned from an ABR from another area. These routes are built based on type 3 LSAs.

Question 5

intra-area route

Answer 5

An OSPF route learned from a router within the same area. These routes are built based on type 1 and type 2 LSAs.

Question 6

router LSA

Answer 6

A type 1 LSA that is a fundamental building block representing an OSPF-enabled interface. Type 1 LSAs remain within the OSPF area of origination.

Question 7

summary LSA

Answer 7

A type 3 LSA that contains the routes learned from another area. Type 3 LSAs are generated on ABRs.