Hi Edward,
This is very common interview question. I was also asked the same question. Here is my answer to this question.
If you are working on plain MVC web application , you could have explained your project structure like short description of how many controllers you are using.For example if your application has a no. of products or services and it is login based then the expected controllers would be "Logincontroller" , "ProductAController" , "ExceptionController" and explain Dao approach for DB communication , components used in model like
EJB , MDBs, webservices. You can also mention like for J2EE application
JSP gets stored in WebContent and controller and model classes goes into src.
SRC
|____Controller
| |___LoginController
| |___ProductA_Controller
| |___ProductB_Controller
|
|____ Model
|___Module A
|___Module B
|___Module C
Thanks,
Neena