主机名到ip是一对一的映射吗？
主机名到ip是一对一的映射吗？一个主机名怎么能有多个IP地址呢？ 根据 Java 的 getAllByName，它返回主机名的 ip 列表，但其文档似乎另有说明，或者至少没有解释一对多映射：
The host name can either be a machine name, such as "java.sun.com", or a textual representation of its IP address.
is host name to ip a one-to-one mapping? how can a host name have multiple ip addresses?
according to Java's getAllByName, it returns a list of ips for a hostName, but its documentation seems to suggest otherwise or at least not explaining the one to many mapping:
The host name can either be a machine name, such as "java.sun.com", or a textual representation of its IP address.
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实际上，一台机器的 IP 取决于该机器所使用的网络接口卡 (NIC) 的数量。因此，如果一台机器安装了 3 个 NIC，则该机器将有 1 个主机名，但有 3 个不同的 IP。
Actually the IP's for a machine depends upon the number of Network Interface Cards(NIC) which are being used for that box. So if a machine has 3 NIC's installed, there will be 1 hostname for that box but 3 different IP's.
不，一个主机名可能有多个 A 记录，在这种情况下，解析器将以列表的形式返回所有 IP 地址。您几乎可以在每个大型网站上查看它：
No, a hostname may have several A records and in this case resolvers will return all IP addresses as a list. You can check it on almost every large web site:
不可以，每个主机名可以有多个指向不同 IP 的 DNS A 记录。这通常用于高级负载平衡。您可以在
google.com上进行检查：No, every host name can have multiple DNS A records pointing to different IPs. This is often used for high-level load balancing. You can check that for example on
google.com: