Have you ever really thought about the importance of DNS to your business?
DNS, the Domain Name System, is sometimes called the “phonebook of the Internet.” Just as the phonebook allows you to look up names, addresses, and phone numbers of people and businesses to be categorized and referenced, DNS allows for domain names and their corresponding IP addresses to be organized and easily accessed. For example, a quick DNS query shows that the IPv4 address for networkworld.com is 220.127.116.11 (and there is apparently no IPv6 address!).
But DNS stores much more than just IP addresses. Email protocols rely on DNS extensively to store information about message routing (MX records), policy (SPF records) and digital signatures (DKIM). DNS also houses cryptographic keys for not only its own security uses, but also for email and now even websites (TLSA records). The extensibility, versatility, and ubiquity of DNS makes it an ideal choice for storing all kinds of information. Because so much depends on DNS, it is a critically important service; every time you use the Internet, you’re relying on DNS.