This is some straight up homework. No one in their right mind is making a username and password glenn/glenn.

I am a part time Linux instructor, and this is the type of stuff i would have my students do.

If it is a legitimate question, then tell us what you tried. Don't just say "I cant do it "

Also, you should look at the Apache manual, it's a great reference guide...much better than the traditional man page.

There is a how-to in there for authentication, its excellent.

just type in "apache docs" in google, and its the first entry.