Reverse nslookup Command

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How do I use nslookup command line administrative tool for testing and troubleshooting DNS servers including reverse lookup under UNIX or Windows operating systems? How do I look up an IP address of a domain or host on a network using nslookup command?

Linux Make Sure /etc/resolv.conf Never Get Updated By DHCP Client

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I am using GNU/Linux with the Internet Systems Consortium DHCP Client. The dhclient, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol. It also updates my /etc/resolv.conf file each time my laptop connects to the different network. I would like to keep my existing nameservers. How do I skip /etc/resolv.conf update on a Linux based system? How do I stop DHCP client from changing resolv.conf on Linux?