a) A computer or an application program that intercepts user requests from the internal network and processes that request on behalf of the user. Based on the above description answer following questions. 1. What it is commonly called? 2. What is role of such computer in securing organizational network? 3. Enlist commonly known types of such computer. [1.5+2+1.5 Marks] b) Differentiate vulnerability scanning and penetration testing. [5 Marks]

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