data terminal equipment
CCNA
Frame Relay Virtual Circuits (VCs): PVCs, SVCs, and DLCIs Explained
We’ve already covered the fundamentals of Frame Relay as a WAN encapsulation protocol. This guide goes deeper into the mechanism that makes Frame Relay work: the virtual circuit. Frame Relay provides connection-oriented data link layer communication specifically through virtual circuits, and understanding exactly how those circuits get established, identified, and torn down is what separates...
CCNA
Introduction to WAN Technologies
A LAN connects devices within a single building or campus. The moment you need to connect that LAN to another one across a city, a country, or the globe, you’re in WAN territory — a fundamentally different set of technologies, ownership models, and design trade-offs. Wide Area Networks are what make hybrid work, branch offices,...