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5.	What are different implicit objects of JSP?
	pageContext: The pageContext object. pageScope: A Map of all the objects that have page scope. requestScope: A Map of all the objects that have request scope. sessionScope: A Map of all the objects that have session scope. applicationScope: A Map of all the objects that have application scope. param: A Map of all the form parameters that were passed to your JSP page. paramValues: HTML allows for multiple values for a single form parameter. This is a Map of all the parameters, just like param, but in this object the values are an array containing all of the values for a given parameter in the event that there's more than one. header: A Map of all the request headers. headerValues: For the same reasons as paramValues, a headerValues object is provided. cookie: A Map of all the cookies passed to your JSP. The value returned is a Cookie object. initParam: A Map that maps context initialization parameter names to their parameter values.
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6.	What are the two important API's in for Servlets?
	Two important packages are required to build servlet "javax.servlet" and javax.servlet.http. They form the core of Servlet API. Servlets are not part of core Java but are standard extension provided by Tomcat.
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7.	What are different Authentication options available in servlets?
	There are four ways of authentication HTTP basic authentication: In HTTP basic authentication the server uses the username and password send by the client. The password is sent using simple base64 encoding but it's not encrypted. HTTP digest authentication: HTTP digest authentication is same as HTTP basic authentication but the biggest difference is password is encrypted and transmitted using SHA or MD5. HTTPS client authentication: HTTPS client authentication is based on HTTP over SSL. It requires that the end client should posses a PKC (Public Key Certificate). This verifies the browsers identity. Form based authentication: In Form based the web container invokes a login page. The invoked login page is used to collect username and password.
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8.	Which are the different ways you can communicate between servlets?
	Below are the different ways of communicating between servlets:- Using RequestDispatcher object. Sharing resource using "ServletContext()" object. Including response of the resource in the response of the servlet. Servlet chaining.
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