DNS Name Server Load Balancing
The Address (A) RR is the most fundamental one in DNS, since it records an actual mapping between a domain name and an IP address. Let's consider for a moment one of the words in that sentence in more detail. No, I don't mean address or RR or mapping. I mean the word an!
The Address record mentions only a single address for each domain name. This means that each domain name maps to only a single physical hardware device. When the number of requests that a particular server or other device needs to handle is relatively small, this is not a problem; the function can usually be implemented using a single physical hardware device. If the server gets busier, the usual solution is to throw more hardware at the problem—get ...
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