Enable Scheduled Algorithm for DNS Host Lookup on Cisco IOS Device

D

Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dns/configuration/15-mt/dns-15-mt-book/dns-config-dns.html

The correct answer is D. "ip domain round-robin" is the command that enables a scheduled algorithm that directs lookup calls to multiple DNS hosts.

Explanation:

The Domain Name System (DNS) is a critical component of any network infrastructure as it is responsible for resolving domain names to IP addresses. In some cases, a network administrator may want to configure multiple DNS servers to provide redundancy and load balancing.

Cisco IOS devices support a feature called DNS round-robin, which enables the device to cycle through a list of DNS servers for name resolution. When this feature is enabled, the device rotates through a list of DNS servers in a round-robin fashion, sending each request to the next server in the list.

To enable DNS round-robin on a Cisco IOS device, the "ip domain round-robin" command should be entered in global configuration mode. This command instructs the device to use round-robin DNS resolution.

For example, to configure DNS round-robin with three DNS servers, the following commands can be used:

scssCopy code
Router(config)# ip name-server 192.168.10.14 Router(config)# ip name-server 192.168.10.15 Router(config)# ip name-server 192.168.10.16 Router(config)# ip domain round-robin 

After entering these commands, the device will use round-robin DNS resolution for all name resolution requests.

Answer A "ip name-server 192.168.10.14 192.168.10.15" is a command that configures the IP addresses of DNS servers that the device should use for name resolution.

Answer B "ip domain list" is a command that displays the current domain search list used by the device.

Answer C "ip domain lookup" is a command that enables DNS resolution on the device. It is not used to configure DNS round-robin.