Probabilistic Assessment of Computer-Based Test (CBT) Network System Consists of Four Subsystems in Series Configuration Using Copula Linguistic Approach

A complex repairable computer-based test (CBT) network system studied in this paper consists of three client computers, a load balancer, two database servers, with the centralized server structured series configuration. Subsystem 1 homogeneous clients arranged parallel configuration, subsystem 2 comprises 3 is comprised distributed servers arrangement and 4 server. Through transition diagram, first-order differential equations are derived. The model has solved using supplementary variables, implications Laplace transforms. Reliability metrics effects such as availability, reliability, MTTF, MTTF sensitivity, cost function estimated to see impact failure repair patterns on reliability evaluations. results study indicated that performance could be improved when copula employed.