Those graphics appear to be Cisco Systems units both of which can be found as a downloadable stencil at:

http://www.cisco.com/c/en/us/product...l-listing.html

Specifically, 3750X from: http://www.cisco.com/c/dam/assets/pr...cd8009b2de.zip

3845 from: http://www.cisco.com/c/dam/assets/pr...cd801d261a.zip

Additionally, http://www.cisco.com/web/about/ac50/ac47/2.html should help.