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SCWCD Certification Practice Tests SCWCD Study Guide (CX-310-081)
 
 Java Security Quiz  

Java Security Quiz:

Please select which of the following statements regarding Java 2 Security is TRUE?

A) The type safety mechanism in the Java language prevents the execution of malicious code
B) Two classes with the same fully qualified name but which are defined by different instances of a class loader are NOT of the same type
C) All signed classes are implicitly trusted and granted full access
D) The principal role of a TrustManager is to determine if presented authentication credentials should be trusted

  • [Ans: B, D]

  • The type of a class is a combination of the fully qualified class name and the defining class loader. That is to say that two classes with the same fully qualified name but which are defined by different instances of a class loader are NOT of the same type.

    However, execution of malicious code is generally thwarted by the bytecode verifier, and NOT necessarily the type safety mechanism of the Java language.

    Signed classes are NOT implicitly granted full access, but rather permissions are assigned to code based on its various characteristics, including whether or not it is signed and if so, by whom. In an applet container, such as the Java Plugin, the user may be prompted when a signed applet is being loaded, to grant the signed code all permission.

    The principle role of a TrustManager is to determine if presented authentication credentials should be trusted.



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