Although LANs and WANs function together to create the Internet, they have different protocols and purposes. The better you understand the features of LANs and WANs, the better you will be at network design, configuration, and troubleshooting. Chapters 3 and 4 of CCNA Discovery 1 and Chapter 5 of CCNA Discovery 2 identify the main features of WANs and LANs.
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