Network Topology Icons taken from https://vecta.io/symbols

https://symbols.getvecta.com/stencil_240/51_cloud.4d0a827676.png => network.png
    #modified to be grey instead of white

https://symbols.getvecta.com/stencil_240/15_atm-switch.1bbf9a7cca.png => packet-switch.png
https://symbols.getvecta.com/stencil_241/45_atm-switch.6a7362c1df.png => emu-packet-switch.png

https://symbols.getvecta.com/stencil_240/204_router.7b208c1133.png => packet-router.png
https://symbols.getvecta.com/stencil_241/224_router.be30fb87e7.png => emu-packet-router.png

https://symbols.getvecta.com/stencil_240/269_virtual-layer-switch.ed10fdede6.png => open-line-system.png
https://symbols.getvecta.com/stencil_241/281_virtual-layer-switch.29420aff2f.png => emu-open-line-system.png

https://symbols.getvecta.com/stencil_240/102_ibm-tower.2cc133f3d0.png => datacenter.png
https://symbols.getvecta.com/stencil_241/133_ibm-tower.995c44696c.png => emu-datacenter.png

https://symbols.getvecta.com/stencil_240/193_programmable-switch.6d97768882.png => optical-roadm.png
https://symbols.getvecta.com/stencil_241/213_programmable-sw.32d3794d56.png => emu-optical-roadm.png

https://symbols.getvecta.com/stencil_240/275_wae.c06b769cd7.png => optical-transponder.png
https://symbols.getvecta.com/stencil_241/289_wae.216d930c17.png => emu-optical-transponder.png
