Explain how to do following in linux

how to list process

how to grep process

how to kill a process

how to know pid

suppose proccess is down how to check it up and bring it up ? ?

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service