Which two statements define the security risk when DNS services are enabled on the network? (Choose two.)

Which two statements define the security risk when DNS services are enabled on the network? (Choose two.)

• By default, name queries are sent to the broadcast address 255.255.255.255.
• DNS name queries require the ip directed-broadcast command to be enabled on the Ethernet interfaces of all routers.
• Using the global configuration command ip name-server on one router enables the DNS services on all routers in the network.
• The basic DNS protocol does not provide authentication or integrity assurance.
• The router configuration does not provide an option to set up main and backup DNS servers.

Exam with this question: CCNA Exploration 4: EWAN Chapter 4 Exam