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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Frame Relay

Frame Relay is still one of the most popular WAN services deployed over the past decade, and there’s a good reason for this—cost. And it’s a rare network design or designer that has the privilege to ignore that all-important cost factor!

By default, Frame Relay is classified as a non-broadcast multi-access (NBMA) network, meaning it doesn’t send any broadcasts such as RIP updates across the network. No worries—I’m not going leave you hanging. We’ll get into this more soon.

Frame Relay has at its roots a technology called X.25, and it essentially incorporates the components of X.25 that are still relevant to today’s reliable and relatively “clean” telecommunications networks while leaving out the no-longer-needed error-correction components. ...

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