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in-addr.arpa domain

Before reverse lookups were introduced, DNS needed to search all the domains in the DNS namespace to identify the hostname corresponding to an IP address. This took a large amount of processing time. To overcome this problem, the in-addr.arpa domain was created, which contains the required DNS records for reverse lookups. The in-addr.arpa domain is a reserved internet DNS namespace.

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Q: What DNS component was introduced to eliminate the large amount of processing time required to perform reverse lookups?
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