OSPF stub areas are an important tool for the Network designer; which of the following two should be considered when utilizing OSPF stub areas? (Choose two)

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OSPF stub areas are an important tool for the Network designer; which of the following two should be considered when utilizing OSPF stub areas? (Choose two)
A . OSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAs
B . OSPF not so stubby areas are particularly useful as a simpler form of summarization
C . OSPF stub areas are always insulated from external changes
D . OSPF totally stubby areas cannot distinguish among ABRs for the best route to destinations outside the area
E . OSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPF domain

Answer: CD

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