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How to Setup a DNS/DHCP Server Using dnsmasq on CentOS/RHEL 8/7

A Dynamic Host Configuration Protocol (DHCP) server dynamically assigns IP addresses and other network configuration parameters to each device on a network. A DNS forwarder on a LAN forwards DNS queries for non-local domain names to upstream DNS servers (outside that network). A DNS caching server answers recursive requests from clients so that the DNS query can be resolved faster, thus improving DNS lookup speeds to previously visited sites.