Abstract: In this talk we explore how classical communication networks can be enhanced with quantum resources. We approach this question from two angles. First, we adopt an information-theoretic point of view and study capacity regions of classical multiple-access channels (MAC). We find that for certain MACs defined in terms of a non-local game the capacity region is enlarged when supplying the senders with entanglement. Non-local games with a perfect quantum strategy such as the magic square game play a crucial role in this resul. Second, we study communication networks from an operational point of view by deriving Bell inequality-like constraints on the possible input-output distributions of classical communication networks with bounded classical communication between nodes. For various network architectures we exhibit violations of these constraints when equipping nodes with quantum resources such as shared entanglement or quantum communication. Our approach yields protocols that certify quantum resources in communication networks and can readily be implemented on near-term quantum networking hardware. This talk is based on the papers arXiv:1909.02479 (with M. Alhejji, J. Levin, G. Smith), arXiv:2205.13538 (with A. Seshadri, V. Siddhu, G. Smith) and arXiv:2403.02988 (with B. Doolittle and E. Chitambar)