In 1992, frame relay was portrayed as an interim technology that would be replaced by Switched Multimegabit Data Service. In 1995, industry insiders predicted frame relay would be devoured by ATM.

Frame relay had a good run, but the rise of MPLS VPNs has spelled the beginning of the end for the old WAN technology. VPNs burst on the scene in the late 1990s as a way to use the Internet securely ...

Monday’s sample question focused on the data link layer addresses used as frames pass over a Frame Relay WAN. Today, I’ll summarize the key points that must be considered when answering that question, ...

Out go ATM, Frame Relay and leased lines. In come DSL, Ethernet and IP virtual private networks (VPNs). It may not be quite that simple but the world of data communications is in the midst of seeing ...