Network-in-a-box (NIB) is one of envisaged enablers to eliminate the connectivity inequality and to enhance network resilience for ubiquitous networking in 6G. NIB suits for supporting one-off networks such as access on demand, emergency access, and traffic off-loading. The core idea of NIB is to pack the whole wireless network into a few or a single portable and reconfigurable box supporting multiple wireless standards for ease and speed of deployment. The advantages of NIB let us question how NIB can be used to sustain ubiquitous network connectivity in 6G. In this talk, the advantages and challenges of NIB will be summarized and NIB optimal deployment problem will be addressed as a case study.