DNS Support on Cisco NX-OS

Explanation.

Sure, I'd be happy to provide you with a detailed explanation of the correct answers for this question:

A. You have to configure a new VRF for DNS client, default VRF cannot be used.

This statement is true. In Cisco NX-OS, you need to configure a new VRF (Virtual Routing and Forwarding) for the DNS client. The default VRF cannot be used for DNS client configuration because it is reserved for system-related traffic and cannot be modified.

B. To map domain names to IP addresses in Cisco NX-OS, you must first identify the host names, then specify a name server, and enable the DNS service.

This statement is also true. To map domain names to IP addresses in Cisco NX-OS, you need to identify the host names first, then specify a name server, and enable the DNS service. This allows Cisco NX-OS to use the name server to resolve host names to IP addresses.

C. You can configure Cisco NX-OS to use only one domain name server to find an IP address for a host name.

This statement is false. In Cisco NX-OS, you can configure multiple domain name servers to find an IP address for a host name. This provides redundancy in case one name server is unavailable.

D. Cisco NX-OS does not allow you to statically map IP addresses to domain names.

This statement is false. In Cisco NX-OS, you can configure static DNS mappings using the "ip host" command. This allows you to map specific IP addresses to host names.

E. Cisco NX-OS supports stateless restarts for the DNS client. After a reboot or supervisor switchover, Cisco NX-OS applies the running configuration.

This statement is true. In Cisco NX-OS, the DNS client supports stateless restarts, which means that after a reboot or supervisor switchover, the DNS client automatically applies the running configuration without requiring a manual restart. This ensures that the DNS service remains available even after a system restart.

I hope this explanation helps you understand the correct answers for this question!