OSPF LSA Type for Remote ASBR Router IDs

A

OSPF LSA types:

LSA Type 1: Router LSA

LSA Type 2: Network LSA

LSA Type 3: Summary LSA

LSA Type 4: Summary ASBR LSA

LSA Type 5: Autonomous system external LSA

LSA Type 6: Multicast OSPF LSA

LSA Type 7: Not-so-stubby area LSA

LSA Type 8: External attribute LSA for BGP

https://networklessons.com/ospf/ospf-lsa-types-explained/

The correct answer is C. Type 3.

OSPF (Open Shortest Path First) is a link-state routing protocol that uses LSAs (Link State Advertisements) to build and maintain a topology database of the network. LSAs are used to describe the state of each link in the network, and they are flooded to all routers in the same OSPF area.

There are several types of LSAs in OSPF, each with a different purpose. Type 1 LSAs are used to describe the state of a router's own links, Type 2 LSAs are used to describe the state of a router's connected subnets, Type 3 LSAs are used to describe the state of networks outside of the local OSPF area, and Type 4 LSAs are used to advertise the presence of an ASBR (Autonomous System Boundary Router) in the OSPF domain.

ASBR routers are routers that connect OSPF domains to external networks or other OSPF domains. When an ASBR router is located in a remote area, Type 3 LSAs are used to advertise the ASBR router's external routes to the other routers in the OSPF domain. Type 3 LSAs describe the state of networks outside of the local OSPF area, including the router IDs of ASBR routers located in remote areas.

Therefore, the correct answer is C. Type 3.