DNS

Question 1

What are the 3 commands used to configure a router as a dns client?

Answer 1

(config) #ip domain lookup (on by default)
(config) #ip name-server [dns servers IP]
(config) #ip domain name [domain name] (optional domain name of your network. The router will append this domain name to host names.)

Question 2

What are the 2 commands used to configure a router as a dns server?

Answer 2

(config) #ip dns server

(config) #ip host [name] [ip] - or - (config)#ipv6 host [name] [ip]

Question 3

What port and protocol does DNS use?

Answer 3

UDP 53. In some cases it will use TCP.