DNS (Domain Name System) on Cisco devices translates domain names into IP addresses, simplifying network management. Cisco routers and switches can use DNS to resolve hostnames in configurations or when executing network commands like ping or telnet.
#DNS "A" record = used to map names tp IPv4 address
#DNS "AAAA" record = used to map names to IPv6 address
#TCP and UDP port = 53
#Windows based OS cmd/ps
ipconfig /displaydns #to show local DNS cache
#Cisco routers can be configured as a DNS client
ip dns server #to create your own table on the router use:
ip host R1 192.168.0.1
ip host PC1 192.168.0.101
ip host PC2 192.168.0.102
ip name-server 8.8.8.8
ip domain lookup #to enable perform DNS queries (enable by default) old version of the command ip domain-lookup
show hosts #to show cache and hosts. temp - temprorary entry; perm - manual configered
ip domain name itbumper.com #to set a domain name