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IBM and Cisco: Together for a World Class Data Center by Jon Tate, Jason Walker, Andy Sholomon, Joe Robinson, Veerendra Para, Ray O'Hanlon, Holger Mueller, Jason Gmitter, Michele Girola, Jeff Gatz, Santiago Freitas, Peter Clemens, Pall Beck

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Data center physical access layer evolution
In this chapter, we examine the evolution of the data center physical access layer over the past two decades. A traditional hierarchical network design consists of the following layers:
Access layer
Distribution layer
Core layer
We consider the physical cabling and data center layout, as well as possibilities for the server architecture:
End-of-Row (EoR)
Middle-of-Row (MoR)
Top-of-Rack (ToR)
Finally, we discuss a number of solutions pertaining to the overall network design.
4.1 Introduction to server ...

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