Security of using sudo rather than su?

[Felipe Alfaro Solana]

>  >3. Third, I configure sudo so that user's have to supply root password
> (not theirs).
>
> How do I do this?

Add the "rootpw" option to the Defaults section in /etc/sudoers. For
example mine looks like this:

Defaults        !lecture,tty_tickets,!fqdn,rootpw

As Derek pointed, you should only do this on single-user machines.