Netweaver administration and SAP Web Application Server r the same?

Hi All,

I am a Basis Consultant & new to Netweaver,..

I am interested in Netweaver administration..

1.I am confused wheather netweaver administration and SAP Web Application Server r the same?(or WAS is just another component of Netweaver).

2.Do we need to administrate all the components of Netweaver(EP,BI,etc.,)seperately as an Netweaver Administrator?

Thanks in Advance ,

Malti