Which three techniques can be used to improve fault isolation in an enterprise network design? (Choose three.)

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Which three techniques can be used to improve fault isolation in an enterprise network design? (Choose three.)
A . aggregate routing information on an OSPF ABR
B . fully meshed distribution layer
C . Equal-Cost Multipath routing
D . EIGRP query boundaries
E . multiple IS-IS flooding domains
F . tuned Spanning Tree Protocol timers

Answer: A,D,E