Which Configuration Allows IP-to-Name Resolutions?

Which of the following should be configured to allow for IP-to-name resolutions?

A.

CNAME

B.

A

C.

PTR

D.

NS.

C.

The correct answer is C. PTR.

IP-to-name resolution is the process of resolving an IP address to a hostname. This is typically done through the use of Domain Name System (DNS). DNS is a hierarchical naming system that maps domain names to IP addresses.

When a user enters a domain name in their browser, the DNS resolver will look up the IP address associated with that domain name and then connect to that IP address. However, in some cases, it is necessary to look up the hostname associated with an IP address. This is where reverse DNS (rDNS) comes into play.

rDNS is a process that allows you to look up the hostname associated with an IP address. It does this by using a special DNS record called a PTR record. A PTR record maps an IP address to a domain name. When a client sends a request for a PTR record, the DNS server will return the hostname associated with that IP address.

In summary, the correct answer is C. PTR, as this record is used to allow for IP-to-name resolutions by mapping an IP address to a domain name. The other options listed are DNS record types but are not used for IP-to-name resolutions.

• A (Address) records map a domain name to an IP address.
• CNAME (Canonical Name) records map an alias hostname to the canonical hostname.
• NS (Name Server) records identify the authoritative DNS servers for a domain.