Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)
A. Use Bidirectional Forwarding Detection
B. Merge all the areas into one backbone area
C. Tune OSPF parameters
D. Make all non-backbone areas stub areas
E. Span the same IP network across multiple areas.
In my opinion, the answers A nd C should be correct.
See: https://www.ciscopress.com/articles/article.asp?p=1763921&seqNum=6
Scroll down to section “Fast Convergence in OSPF” where only the topics “tuning ospf parameters” and “BFD” are being mentioned/discussed.