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By Robert M. Switzer

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Extra info for Algebraic topology--homotopy and homology (Die Grundlehren der mathematischen Wissenschaften in Einzeldarstellungen mit besonderer Berücksichtigung der Anwendungsgebiete)

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The best feature of end-to-end VLANs is that users can be placed in a VLAN regardless of their physical location. The administrator defines the port the user is connected to as a VLAN member. If the user moves, the administrator defines their new port as a member of their existing VLAN. In accordance with the 80/20 rule, the goal of an administrator in defining endto-end VLANs is to maintain 80 percent of the network traffic as local, or within the VLAN. Only 20 percent or less should extend outside the VLAN.

In particular, you will learn how to implement FastEthernet, Gigabit Ethernet, Fast EtherChannel, and Multi-Layer Switching (MLS) in the emerging campus designs. This will help you learn how to design, implement, and maintain an efficient and effective internetwork. Finally, you will learn about the Cisco hierarchical model, which is covered in all the Cisco courses. In particular, you will learn which Catalyst switches can—and should—be implemented at each layer of the Cisco model. And you will learn how to design networks based on switch and core blocks.

Understanding Campus Internetworks I t doesn’t seem that terribly long ago that the mainframe ruled the world and the PC was used simply to placate some users. However, in their arrogance, mainframe administrators never really took the PC seriously, and like rock ’n’ roll naysayers, they said it would never last. Maybe they were right after all—at least in a way. In many cases, server farms have replaced distributed servers in the field. In the last 15 years, we have seen operators and managers of the mainframe either looking for other work or taking huge pay cuts.

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