在DNS中'沒有這樣的名字'是什麼意思？

Question

因此，我目前使用Wireshark來調查DNS流量。在命令提示符下，我正在運行查詢nslookup來查找域。在wireshark我得到以下回應：

Flags: 0x8183 Standard query response, No such name 
    1... .... .... .... = Response: Message is a response 
    .000 0... .... .... = Opcode: Standard query (0) 
    .... .0.. .... .... = Authoritative: Server is not an authority for domain 
    .... ..0. .... .... = Truncated: Message is not truncated 
    .... ...1 .... .... = Recursion desired: Do query recursively 
    .... .... 1... .... = Recursion available: Server can do recursive queries 
    .... .... .0.. .... = Z: reserved (0) 
    .... .... ..0. .... = Answer authenticated: Answer/authority portion was not authenticated by the server 
    .... .... ...0 .... = Non-authenticated data: Unacceptable 
    .... .... .... 0011 = Reply code: No such name (3) 

'沒有這樣的名字'是什麼意思，爲什麼它被顯示？

Answer 1

看NXDOMAIN的描述在RFC 1035第4.1.1節：

https://tools.ietf.org/html/rfc1035#section-4.1.1

  3    Name Error - Meaningful only for 
          responses from an authoritative name 
          server, this code signifies that the 
          domain name referenced in the query does 
          not exist.