|  |  | Summary

Now that you completed this chapter, you should have a firm understanding of the following: A WAN is used to interconnect LANs that are separated by a large geographic distance. A WAN provides a data path between routers and the LANs that each router supports. Many types of WAN services are available to the WAN subscriber, which must know how to interface to the WAN provider's service. WAN devices include WAN switches, modems, and ISDN TAs. A WAN mainly operates at the OSI physical and data link layers. WAN encapsulation formats include PPP and HDLC encapsulation. WAN link options include dedicated lines such as point-to-point links, packet-switched connections such as Frame Relay, and circuit-switched connections such as DDR and ISDN.
| Threaded Case Study
Washington Project School District Project Task: WANs

In this chapter, you have learned about the WAN technologies that enable you to interconnect all the individual Washington School District sites into the WAN topology.

You need to complete the following tasks:

1. Select WAN services for the district WAN-to-site, WAN core-to-WAN core, and WAN-to-Internet connections.
2. Determine the costs and the range of WAN services.
3. Begin Documenting the WAN design.
4. 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):

WANs

- Differentiate between the following WAN services: Frame Relay, ISDN/LAPD, HDLC, and PPP.***

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