>nslookupDefault Server: Address: > （ 不设置类型 直接查询信息无法获得）Server: Address: DNS request timed out. timeout was 2 seconds.DNS request timed out. timeout was 2 seconds.*** Request to timed-out> server （ 不设置类型 直接查询信息可以获得）Default Server: Address: > Server: Address: Name: Served by:- > set type=all> Server: Address: nameserver = internet address = > server （ 设置类型 查询信息可以获得）Default Server: Address: > set type=all> Server: Address: Non-authoritative answer: nameserver = nameserver = internet address = 为什么会存在以上差异？在不设置类型时查询到的信息是什么样的信息？和设置set type=all有什么不同？
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这是什么?