|1:||RFC 1700 defines what well-known ports for DNS?|
DNS is permitted by RFC 1700 to use both TCP/UDP port 53. Typically UDP is vendor-configured for UDP port 53.
|2:||What supplies DNS security?|
DNS has no form of security, so any device can request name-to-IP address mappings.
|3:||What IOS command will stop a Cisco router from querying a DNS server when an invalid IOS command is entered on the EXEC or PRIV prompt?|
To disable DNS query lookup, the IOS command ...