caption: an overview of the network
exif: {"Image DocumentName": "Topology of xDSL access network", "Image ImageDescription": "QoS in access networks \u2013 xDSL (1) Topology of xDSL access network.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}