Question: who created lsa type 4?
Answer: Type 3 – Summary LSA: The summary LSA is created by the ABR and flooded into other areas. Type 4 – Summary ASBR LSA: Other routers need to know where to find the ASBR. This is why the ABR will generate a summary ASBR LSA which will include the router ID of the ASBR in the link-state ID field.