CompTIA Security Plus Mock Test Q693

A software development company has hired a programmer to develop a plug-in module to an existing proprietary application. After completing the module, the developer needs to test the entire application to ensure that the module did not introduce new vulnerabilities. Which of the following is the developer performing when testing the application?

A. Black box testing
B. White box testing
C. Gray box testing
D. Design review


Correct Answer: C
Section: Threats and Vulnerabilities

Explanation:
In this question, we know the tester has some knowledge of the application because the tester developed a plug-in module for it. However, the tester does not have detailed
information about the entire application. Therefore, this is a grey-box test.
Gray box testing, also called gray box analysis, is a strategy for software debugging in which the tester has limited knowledge of the internal details of the program. A gray box is a
device, program or system whose workings are partially understood.
Gray box testing can be contrasted with black box testing, a scenario in which the tester has no knowledge or access to the internal workings of a program, or white box testing, a
scenario in which the internal particulars are fully known. Gray box testing is commonly used in penetration tests.
Gray box testing is considered to be non-intrusive and unbiased because it does not require that the tester have access to the source code. With respect to internal processes, gray
box testing treats a program as a black box that must be analyzed from the outside. During a gray box test, the person may know how the system components interact but not have
detailed knowledge about internal program functions and operation. A clear distinction exists between the developer and the tester, thereby minimizing the risk of personnel conflicts.

Incorrect Answers:
A: Black-box testing is a method of software testing that examines the functionality of an application without peering into its internal structures or workings. This method of test can be
applied to virtually every level of software testing: unit, integration, system and acceptance. It typically comprises most if not all higher level testing, but can also dominate unit testing
as well.
Specific knowledge of the application’s code/internal structure and programming knowledge in general is not required. The tester is aware of what the software is supposed to do but is
not aware of how it does it. For instance, the tester is aware that a particular input returns a certain, invariable output but is not aware of how the software produces the output in the
first place.
In this question, the tester has some knowledge of the application.
B: White-box testing (also known as clear box testing, glass box testing, transparent box testing, and structural testing) is a method of testing software that tests internal structures or
workings of an application, as opposed to its functionality (i.e. black-box testing). In white-box testing an internal perspective of the system, as well as programming skills, are used to
design test cases. The tester chooses inputs to exercise paths through the code and determine the appropriate outputs. This is analogous to testing nodes in a circuit, e.g. in-circuit
testing (ICT).
White-box testing can be applied at the unit, integration and system levels of the software testing process. Although traditional testers tended to think of white-box testing as being
done at the unit level, it is used for integration and system testing more frequently today. It can test paths within a unit, paths between units during integration, and between subsystems
during a system–level test.
In this question, the tester has some knowledge of the application but not the detailed knowledge required for a white-box test.
D: A design review in terms of application development is the process of reviewing the design of the modules and units used in the application. However, in this question, the
application has already been developed. Furthermore, a design review does not describe the process of testing an application.

References:
http://searchsoftwarequality.techtarget.com/definition/gray-box
http://en.wikipedia.org/wiki/Black-box_testing
http://en.wikipedia.org/wiki/White-box_testing