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

https://symbols.getvecta.com/stencil_240/51_cloud.4d0a827676.png => cloud.png

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