多选题What are BCP 38 （Best Common Practices 38）/RFC 2827 Ingress Packet Filtering Principles？（）AFilter Smurf ICMP packets.BFilter as close to the core as possibleCFilter as close to the edge as possibleDFilter as precisely as possibleEFilter both source and destination where possible
多选题
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
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