There are many motivations for taking measurements in the Internet; from
serving as a basis for scientific study to performing day to day
operational tasks.  While taking measurements in the Internet can be as
simple as running "pings" from a single desktop system, systematic large
scale measurements are fraught with difficulty.  In this tutorial we
present an overview of the tools and techniques for taking measurements of
a variety of Internet features and behaviors.  We also present the major
infrastructures that have been deployed recently (and not so recently) for
taking large scale measurements of the Internet.  These infrastructures are
principally used to gather data on Internet topology, routing, and traffic 
behavior. We discuss the basic techniques for analyzing Internet
measurement data and discuss the many challenges facing researchers who
want to use data taken in Internet measurement infrastructures.