Adding two separate DNS on ICX 7850 as well adding two separate TACACS

Hi WIFI Expert I have an ICX7850-48 port using it as a Core router , if we configure two private DNS server on ICX7850 using this command 7850(Config)#ip dns server-address 10.192.0.17850(Config)#ip dns server-address 10.190.0.1will the Icx treat each DNS as a separate entity or treat the second DNS as a failover DNS?the second question related to the same ICX7850 if we add two different radius server to have two different organization authenticate/access ICX7850, will ICX7850 treat each Radius configuration as separate authentication or ICX7850 treat them second radius configuration as a failover if the 1st Radius failed thanks