I’m Network Engineer by trade, I thought I’d share my home lab setup which I am currently using to study CCNP R&S and also some study towards CCIE Collaboration.

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From top to bottom:

3x Cisco 3650 24 Port POE Switches
2X Cisco 3750 24 Port Switches Stacked
1X Cisco Catalyst 4006 Modular Chassis

1x HP DL380 G6 Server with 144GB of RAM and ~1TB storage

Else where but not pictured:
3x Cisco 9971 Phones
1x Cisco 2811
1x Cisco 2851 with FXO / FXS / ISDN ( Collab )