Method(s) and System(s) for managing traffic-overload on Domain Name System (DNS) server during a network overload are described. The described system(s) may implement method(s) that include monitoring of traffic associated with the DNS server and identifying an occurrence of an event. Thereafter, activating (deactivating) a rescue mode and implementing one or more policies for handling the traffic during the rescue mode. In implementing the one or more policies, the method includes segregating the traffic into three sets of requests based on availability of responses in a cache, and a Time to Live (TTL) associated with the responses. Further, the method includes processing a first set of requests for which corresponding responses stored in the cache have expired based on TTL of corresponding responses. Furthermore, the method includes transmission of the corresponding responses with expired data to the client devices.