When the PDNS service encounters a malicious or suspicious query, it can respond in several ways. The PDNS may restrict access to the requested domain by returning an NXDOMAIN response, meaning no IP address for
PDNS provider, the NSA and CISA recommend finding a service that “provide[s] malicious activity alerts, enterprise dashboard views, historical logging and analysis, and [...] due to DNS being foundational to most online activity, ensure that PDNS is provided as a high availability service....
Zhang Y,Song L S,Zhao J Met al.Protective immunity induced by CpG ODNs against white spot syndrome virus (WSSV) via intermediation of virus replication indirectly in Litopenaeus vannamei. Developmental and Comparative Immunology . 2010Zhang Y, Song L, Zhao J, Wang L, Kong P, Liu L, et ...