Chapter 1 - Memory Table

Question 1

LSA Type 1

Answer 1

OSPFv2
Called Router LSA. LSA sent to every router. This LSA includes the state and the cost of all links and a lsit of all OSPFv2 neighbors on the link. Router LSAs trigger an SPF recalculation. Router LSAs are flooded to the local OSPFv2 area.

OSPFv3
Called Router LSA. LSA sent by every router, which includes the state and cost of all links but does not include the prefix information. Routers LSAs trigger an SPF recalculation. Router LSAs are flooded to the local OSPFv3 area.

Question 2

LSA Type 2

Answer 2

OSPFv2
Called Network LSA. LSA sent by the DR. This LSA lists all routers in the multi-access network. Network LSAs trigger an SPF recalculation.

OSPFv3
Called Network LSA. LSA sent by the DR. This LSA lists all routers in the multi-access network but does not include prefix information. Network LSAs trigger an SPF recalculation.

Question 3

LSA Type 3

Answer 3

OSPFv2
Called Network Summary LSA. LSA sent by the area border router to an external area for each destination in the local area. This LSA includes the link cost from the area border router to the local destination.

OSPFv3
Called Inter-Area Prefix LSA. Same as OSPFv2; just the name changed.

Question 4

LSA Type 4

Answer 4

OSPFv2
Called ASBR Summary LSA. LSA sent by the area border router to an external area. This LSA advertises the link cost to the ASBR only.

OSPFv3
Called Inter-Area Router LSA. Same as OSPFv2

Question 5

LSA Type 5

Answer 5

OSPFv2
Called AS External LSA. LSA generated by the ASBR. This LSA includes the link cost to an external autonomous system destination. AS External LSAs are flooded throughout the autonomous system.

OSPFv3
Same as OSPFv2.

Question 6

LSA Type 7

Answer 6

OSPF v2
Called NSSA External NSA. LSA generated by the ASBR within a not-so-stubby area (NSSA). This LSA includes the link cost to an external autonomous system destination. NSSA External LSAs are flood only within the local NSSA.

OSPFv3
Same as OSPFv2.

Question 7

LSA Type 8

Answer 7

OSPFv3
Called Link LSA (New OSPFv3 LSA). LSA sent by every router, using a link-local flooding scope. This LSA includes the link-local address and IPv6 prefixes for this link.

Question 8

LSA Type 9

Answer 8

OSPF v2
Called Opaque LSAs. LSA used to extend OSPF.

OSPFv3
Called Intra Area Prefix LSA. LSA sent by every router. This LSA includes any prefix or link state changes. Intra-Area Prefix LSAs are flooded to the local OSPFv3 area. This LSA does not trigger SPF recalculation.

Question 9

LSA Type 10

Answer 9

OSPF v2

Called Opaque LSAs. LSA used to extend OSPF.

Question 10

LSA Type 11

Answer 10

OSPF v2
Called Opaque LSAs. LSA used to extend OSPF.

OSPFv3
Called Grace LSAs. LSA sent by a restarting router, using a link-local flooding scope. This LSA is used for a graceful restart of OSPFv3.