Titlebook: Cisco Networks; Engineers‘ Handbook Chris Carthern,William Wilson,Noel Rivera Book 2021Latest edition Chris Carthern and William Wilson an

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Introduction to Practical Networking,l and discuss how it relates to networking. We talk about all seven layers of the OSI model. Then we move on to the TCP/IP model and show its relation to the OSI model. We end the chapter discussing well-known port numbers, the different types of networks, and Cisco’s hierarchical internetwork model

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The Physical Medium,orking in a rack? This chapter focuses on problems at layer 1—the physical layer—and how this layer is overlooked when network problems are experienced. A common example is a cable with a loose connection. I once left a network down for two days before actually looking at the port to determine the i

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Data Link Layer,rse Address Resolution Protocol (RARP), Link Layer Discovery Protocol (LLDP), and Cisco Discovery Protocol (CDP). As mentioned earlier, the data link layer must ensure that messages are transmitted to devices on a LAN using physical hardware addresses, and it also must convert packets sent from the