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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Frame Relay Frames

Because Frame Relay is primarily a Layer 2 technology, I want to spend a bit more time with the encapsulation, frame format, and signaling for purposes of supporting it.

Encapsulation

I wouldn't expect encapsulation to be a new topic for you. In this chapter you just change your WAN encapsulation or frame type from HDLC to Frame Relay to communicate using a connection-oriented Data Link Layer technology. With Frame Relay you communicate from DTE (router) to DTE (router) through a provider. Each data-link segment connects to the nearest Frame Relay switch (DCE). Typically the DLCI has local significance. This local significance is just like my cell phone speed dial. I have programmed number 1 to be Mom, and number 2 to be Ed, ...

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