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單項選擇題

Which statement best describes Cisco IOS Zone-Based Policy Firewall?()

A.A router interface can belong to multiple zones.
B.Policy maps are used to classify traffic into different traffic classes, and class maps are used to assignaction to the traffic classes.
C.The pass action works in only one direction
D.A zone-pair is bidirectional because it specifies traffic flowing among the interfaces within the zone-pair in both directions.

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