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This lesson focuses on Domain Naming System (DNS) security. The Domain Naming System is probably the most important service running on a network at any given time. Domain naming systems keeps track of all record within a domain and where every server is and what service it provides. DNS knows everything there is to know about a network. DNS can be attacked through the cache system and get become poisoned by sending queries to rogue servers. To create DNS security, it is important to know about the Transaction Signatures (TSIGS) which secure zone transfer via secret keys to ensure each endpoint is authentic.