|  |  | Summary

Now that you have completed this chapter, you should have a firm understanding of the following: Frame Relay WAN technology provides a flexible method of connecting LANs over Frame Relay WAN links. Frame Relay provides a packet-switching data communication capability that is used across the interface between user devices (such as routers, bridges, and host machines) and network equipment (such as switching nodes). Frame Relay uses virtual circuits to establish connections across the WAN. The main functions of the LMI process are: Determine the operational status of the various PVCs that the router knows about Transmit keepalive packets to ensure that the PVC stays up and does not shut down due to inactivity Tell the router what PVCs are available The Inverse ARP mechanism allows the router to automatically build the Frame Relay map The router next-hop address determined from the routing table must be resolved to a Frame Relay DLCI Frame Relay can divide a single physical WAN interface into multiple subinterfaces.
| Threaded Case Study
| Washington School District Project Task: Frame Relay In this chapter, you have learned concepts and configuration processes that will help you implement a Frame Relay data link in the Washington School District network. You will design and implement the Frame Relay link to the Internet per the TCS Overview. This is the final step in the district network implementation. As part of the configuration and implementation, you need to complete the following tasks: Describe how Frame Relay will be inserted in the WAN implementation, what speed will be required, and the benefits of Frame Relay. Document the insertion of Frame Relay in the WAN implementation, including: DLCI numbers The value of the CIR A description of all data communication equipment needed to accomplish implementation Document the router commands needed to implement Frame Relay on the firewall router and how the router configuration changes. Apply the CCNA Certification Exam Learning Objectives to your specific design. This will require a paragraph on how the learning objectives relate to your design. Learning objectives can be grouped together for the purpose of explanation. In this way, you will be studying for their CCNA Certification Exam as you work through the case study. CCNA Certification Exam Learning Objectives (*** are explicit CCNA Exam objectives; unmarked are knowledge assumed by the exam): General Describe at what layer of a hierarchical WAN model an ISDN link should be installed OSI Model Describe what layers of the OSI model Frame Relay standards address and their functions at these layers. Frame Relay Describe DLCI's and their functions in a Frame Relay implementation. Describe LMI's and their function in a Frame Relay implementation. Describe a 'Permanent Virtual Circuit'. Describe connection-oriented network service and connectionless network service, and identify the key differences between them*** Describe 'Committed Information Rate' (CIR) and its function. Describe 'Forward Explicit Congestion Notification' (FECN) and its function. Describe 'Backward Explicit Congestion Notification' (BECN) and its function Describe 'Discard Eligibility' (DE) and its function. Recognize key Frame Relay terms and features*** List commands to configure Frame Relay LMIs, maps, and subinterfaces*** List commands to monitor Frame Relay operation in the router***
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