The development of interactive learning media is an urgent need at SMK Imelda Medan, especially in the subject of Fundamentals of Network Engineering and Telecommunications. This research aims to develop a standalone interactive E-Module that is valid and effective to improve student learning outcomes. The method used is Research and Development (R&D) with the 4-D model (define, design, develop, disseminate), involving experimental and control classes. The research sample consisted of 108 students of class X Computer and Network Engineering Expertise Programme, selected through purposive sampling. Data analysis included validity, reliability, effectiveness, and statistical tests such as Kolmogorov-Smirnov, Levene, MANOVA, and effect size calculation. The validation results showed that the E-Module was valid and reliable with a loading factor value > 0.7, AVE > 0.5, and reliability value > 0.8. The average score of experimental class students was higher (86.04), especially in practice with a difference of 10.67 points. The paired sample t-test showed a significant difference (p < 0.001) with a very large effect size (Cohen's d > 1.8). MANOVA confirmed significant multivariate differences. This study proved the high effectiveness of the E-Module and made theoretical, practical, and pedagogical contributions to digital learning in vocational education.
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