Name servers and DNS
The domain name system is the protocol that regulates the exchange of data between computers over the internet. It converts the domain name, for example, www.domain.com that you input into the browser into an Internet Protocol (IP) address like 24.784.45.91. The IP address is the only way that links computers and hence is how they communicate. Since remembering all IP addresses can be a daunting task, websites are normally re-routed through DNS servers that convert for us. A DNS server composes of a huge database of records that matches every user-friendly domain typed with its corresponding IP address. Normally, DNS records mode of entry differs from one web host to another.
Address (A) records are responsible for linking a domain name to its IP address. They are of utmost importance since only with them can the conversion of a website to IP address be possible. It’s important to note that for some web hosts, a period is required after the hostname. Canonical name (CNAME) records provide appropriate aliases for the domain established in the record.
Mail Exchange (MX) Specify the mail server that accepts the email messages on behalf of the domain. They are arranged in order of priority if you have numerous ones. This prioritization acts from the lowest when a mail is sent such that the MX record with the lowest priority receives the email. This, however, does not pose such major concerns since all mail providers provide the option of what to input here.
Time to Live
This is a term normally used to refer to the total time it takes for data cached in the DNS to be deleted. In a nutshell, it entails the amount of time that it takes for name server changes to take effect. This is normally measured in seconds, and it can vary with the DNS. An example is where you need to add an address (A) record to your DNS records, and the TTL is 86400. Simply put that change will be effected in not less than 24 hours.
Lowering the TTL before you add a record ensures faster propagation of the data. Thus it is always advisable that for quicker changes you always ensure a low TTL. However, the majority of DNS services restrict the minimum TTL that you can set. They do so to minimize their server load.
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