Ralph is an enterprise administrator for wingtip toys, which has recently expanded its customer service division by adding 100 workstations. all of the workstations on the company network are configured to use a server on the perimeter network as their primary dns server and a servver on their isp's network as a secondary. as a result of the expansion, internet performance has slowed down perceptibly, and a network monitor trace indicates that there is a disproportionate amount of dns traffic on the link between the perimeter network and the isp's network. what are two ways that ralph can reduce the amount of dns traffic passing over the internet connection