Can anybody explain how to install cucm .In simple way. I tried to read Cisco page don't understand anything.Please help

I upgraded the Cisco switch 3850,for version 16.9. But i am not sure while installing the software package. with command.switch#request platform software package install switch all file flash:cat3k_caa-universalk9.16.09.04.SPA.binswitch is not in sta...

Cannot able to configure (config)#no ip domain-lookup(config)#ip domain-name hello.com      (this is an example for domain name) in cisco 9300 switches