多选题For which three events can web application event listeners be registered？ （）Awhen a session is createdBafter a servlet is destroyedCwhen a session has timed outDwhen a cookie has been createdEwhen a servlet has forwarded a requestFwhen a session attribute value is changed
第1题：
Given an Http Session session. A Servlet Request request. And a Servlet Context context. Which retrieves a URL to /WEB INF/ my config.xml within a web application？（）
第2题：
A developer is designing a web application that must verify for each request： The originating request is froma trusted network. The client has a valid session.The client has been authenticated. Which design pattern provides a solution in this situation？（）
第3题：
Which two options best describe the purpose of session ID and cookie field in a L2TPv3 packet？（）
第4题：
Which three are described in the standard web application deployment descriptor？（）
第5题：
Which three are described in the standard web application deployment descriptor？（）
第6题：
Your web application uses a simple architecture in which servlets handle requests and then forward to aJSP using a request dispatcher. You need to pass information calculated by the servlet to the JSP；furthermore， that JSP uses a custom tag and must also process this information. This information mustNOT be accessible to any other servlet， JSP or session in the webapp. How can you accomplish this goal？（）
第7题：
Which interface must a class implement to be informed of a session creation event？（）
第8题：
A developer has created a web application that includes a servlet for each use case in the application.These servlets have become rather difficult to maintain because the request processing methods havebecome very large. There is also common processing code in many servlets because these use cases arevery similar. Which two design patterns can be used together to refactor and simplify this web application？（）
第9题：
能够实现Session功能的方法有（）
第10题：
关于Servlet／JSP的Session ID，（）是正确。