According to the passage, what roles did customs play in the 1980s and the period after 2006?
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What drove the alterations of customs roles?
What structural reform occurred to customs in some countries?
What problem(s) does the author think faces customs?
假定一个 NAT 路由器的公网地址为 205.56.79.35,并且有如下表项。且有如下表项。转换端口 源 IP 地址 源端口2056 192.168.32.56 2l2057 192.168.32.56 201892 192.168.48.26 802256 192.168.55.106 80它收到一个源 IP 地址为 192.168.32.56,源端口为 80 的分组,其动作是( )。
A. 转换地址,将源 IP 变为 205.56.79.35,端口变为 2056,然后发送到公网
B. 添加一个新的条目,转换 IP 地址以及端口然后发送到公网
C. 不转发,丢弃该分组
D. 直接将分组转发到公网上