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When a packet arrives at the gateway, the gateway checks it against the rules in the hop Policy Layer, sequentially from top to bottom, and enforces the first rule that matches a packet. Which of the following statements about the order of rule enforcement is true?
Correct Answer: C
Explanation When a packet arrives at the gateway, the gateway checks it against the rules in the top Policy Layer, sequentially from top to bottom, and enforces the first rule that matches the packet. The order of rule enforcement depends on the action of the matching rule. If the action is Accept, the gateway allows the packet to pass through the gateway, but also continues to check rules in the next Policy Layer down. If the action is Drop, Reject, or Encrypt, the gateway applies that action to the packet and stops checking rules in that Policy Layer and any subsequent Policy Layers. If there is no matching rule in a Policy Layer, the gateway applies the Implicit Clean-up Rule for that Policy Layer, which is usually Drop.