The COVID-19 episode has left the institutions worldwide, which were earlier reluctant to change their traditional pedagogical approaches, with no choice than an emergency shift to virtual learning, creating several arguments associated with digital infrastructure, digital divide, digital literacy, technical and pedagogic skills of teachers, digital contents and so on. With this background, this study intended to assess the implementation mechanism of COVID-19-lockdown-induced emergency online learning at undergraduate level in Assam, its effectiveness, and finally the problems faced therein, from the perspective of students' experience and satisfaction. Primary data were collected from 132 undergraduate students drawn at random from different provincialized colleges in Assam through using a questionnaire in Google Form structured on the basis of available literature. The result revealed that 46.21% students perceive emergency online learning partially effective, 34.09% as effective, and 19.70% as ineffective. Poor Internet connectivity, irregular electricity, high cost in data plans, lack of compatible devices, lack of conducive environment at home, lack of technical and pedagogic skills of teachers, insufficient students' engagement and so on, turned out to be the main challenges of online learning. Thus, the findings sufficiently yield the need of collaborative effort to improve digital infrastructure, reduce cost involvement and well-structured teachers' training on pedagogical and technical skills. Creating, adopting and evaluating innovative techniques and tools, student-friendly contents, and above all a positive attitude are next to none measures to be accelerated for inclusive and effective online delivery of higher education in India in coming days.