A network administrator is tasked with configuring a reverse DNS lookup for a subnet used by company email servers. After setting up the necessary zone files, which type of DNS record should they add to associate the subnet's IP addresses with a canonical hostname?
NS records
MX records
PTR records
To establish reverse DNS lookups for an IP address, a PTR record is needed in the DNS configuration. This record maps the IP address of a device or server to its canonical hostname, confirming the server's identity to other systems, specifically for functions like email delivery authentication. Other records like NS or MX do not perform this association for reverse lookups. NS records delegate DNS zones to other servers while MX records direct email to mail servers according to their priorities and are unrelated to reverse DNS configurations.
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