Albert Greenberg of Microsoft describes progress in IP network traffic matrix inference, arguably one of the most important technical problems in the engineering and management of large-scale IP networks. Greenberg discusses tomo-gravity (how to compute accurate traffic matrices for large ISPs in seconds), and anomography (how to accurately detect anomalies, at network-level, for large ISPs in seconds). The methods rely only on ubiquitously available link load and configuration data. (Series: CSE Colloquia - 2007)