Summary
The Ethernet protocol provides a standard way for network devices to efficiently use the lines of communication in a network. A device can use frames and MAC addressing to communicate with one device on a LAN or all devices. Routers and switches ensure that local communication remains local while forwarding transmissions destined for other areas. You can further review the topics from today on pages 71–84 and 89–112 of CCNA Flash Cards and Exam Practice Pack (CCENT Exam 640-822 and CCNA Exams 640-816 and 640-802), Third Edition.
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