How to check DNS propagation on Linux
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While DNS introduces human-readable naming schemes for Internet hosts, it also brings with it extra overhead associated with resolving names to IP addresses. For end users, this overhead means additional DNS lookup latency for accessing any Internet host. For service providers, this implies the performance-critical DNS infrastructure that needs to be maintained. Minimizing these overheads has led to the extensive use of "caching" throughout DNS hierarchy. For example, there are web browser/OS's built-in DNS cache; DNS caching server of the local network; and the cache of local DNS servers operated by service providers, etc.
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