【单选题】【消耗次数：1】
应用层 DNS协议主要用于实现哪种网络服务功能？ （ ）.
①
IP 地址到网络硬件地址的映射
②
网络硬件地址到 IP地址的映
射
③
Internet域名到IP地址的映射
④
用户名到进程地址的映射
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