Abstract:

In domain name system（DNS）, in order to alleviate the load of root servers, recursive servers cached some resource records（RR）. If communication link to root server（or other authoritative servers）broke due to network and other reasons, the cache of RR in recursive server decided the quality of resolving services（QoRS）. It was explored that factors impact QoRS and how through theoretical analysis and mathematical modeling.

Key words: domain name system, quality of resolving service, mathematical modeling, recursive server