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https://datatracker.ietf.org/doc/html/rfc1035#section-4.1.1 mapdns回复报文中不存在 Additional RRs，根据rfc定义，ARCOUNT可以是0
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https://datatracker.ietf.org/doc/html/rfc1035#section-4.1.1
mapdns回复报文中不存在
Additional记录，但是mapdns回复报文中Additional RRs: 1mapdns伪造报文时
Additional RRs: 1，但是不存在相对可变长度的Additional记录，显示以下警告:dig 警告：
Wireshark警告：
符合RFC规范(Additional RRs: 0 && Additional=null):