多项选择题

WhichstatementsaretrueconcerningNAT？（）……

Which statements are true concerning NAT？（）

A. NAT provides 1 to manyaddress mapping.
B. NAT provides 1 to 1 address mapping.
C. NAT is only useful forTCP/UDP and ICMP traffic.
D. NAT can be used for all IP traffic.

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