What are BCP 38 （Best Common Practices 38）/RFC 2827 Ingress Packet Filtering Principles？（）
- A、Filter Smurf ICMP packets.
- B、Filter as close to the core as possible
- C、Filter as close to the edge as possible
- D、Filter as precisely as possible
- E、Filter both source and destination where possible
正确答案:C,D,E
答案解析:有
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