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If the type is "A" in DNS records, which of the following pairs of name and value is correct?

(a) Name: www.example.com, Value: 192.168.1.1
(b) Name: mail.example.com, Value: 10.10.10.1
(c) Name: ftp.example.com, Value: 172.16.0.1
(d) Name: vpn.example.com, Value: 198.51.100.1

Answer :

Final answer:

All the given domain name and IPv4 address pairs could potentially be correct in a DNS Type A record if they are intended for services hosted on those IP addresses, although the IP addresses given are commonly used for private networks or documentation purposes.

Explanation:

When dealing with DNS records, a Type A record is used to map a domain name to an IPv4 address. Among the options provided:
(a) Name: www.example.com, Value: 192.168.1.1,
(b) Name: mail.example.com, Value: 10.10.10.1,
(c) Name: ftp.example.com, Value: 172.16.0.1, and
(d) Name: vpn.example.com, Value: 198.51.100.1,
all could potentially be correct if they are intended to point to services hosted on the respective IP addresses.

However, given that 192.168.1.1, 10.10.10.1, and 172.16.0.1 are IP addresses that fall within the private IP address range, they would not be routable on the internet, which makes them unusual choices for a publicly accessible DNS record. Conversely, 198.51.100.1 is an IP address from the range specifically reserved for documentation and example code, which indicates that it would not be a suitable real-world value for a DNS A record either. In a real-world situation, the IP address for an A record should be a public IPv4 address that is routable on the internet.

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