Which of the following are similarities between OSPF and IS-IS? Choose two answers.

Which of the following are similarities between OSPF and IS-IS? Choose two answers.
A . Metric is based on hop count.
B . Slow convergence after link failures.
C . Support hierarchy through the use of areas.
D . Support for CID
F . Link state updates sent using layer 3 multicast.

Answer: C,D