OS X has lots very rich and well designed icons that show up during regular use. I often find myself wanting to use those images when drawing diagrams. Rather than scour the Internet, you can use the beautiful 1024 x 1024 pixel images already on your Mac. They are located in:

/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources

Another handy place to look for icons of Apple network gear is inside AirPort Utility:

/Applications/Utilities/AirPort\ Utility.app/Contents/Resources