Performance Characterization of DNS Relay in Geographically Distributed LAN

Abstract — DNS is a distributed scalable, reliable naming system that translates symbolic domain names to IP address and viceversa. Whenever there is request for a particular host, via, Web browser, Local DNS resolver contact DNS server to determine server’s IP address then it forwards request to next DNS server at next higher level in hierarchy. When DNS server receives query it checks whether it is based on resource records stored in its local cache. If found response from cache to requesting client then query is completed and if name not found even at the A. Distributed LAN Network ROOT DNS, assistance is taken from DNS server to resolve the name.DNS caching reduces access time for the host for data transfer and number of iterative requests processed by name server. Thereby increasing performance and reducing DNS query traffic on the network. In this paper security feature of DNS is not included