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.
正确答案:B,D
答案解析:有
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