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This paper describes a measurement center for the NBSNET, a distributed, broadcast local area computer network (LAN) at the National Bureau of Standards. A LAN measurement center allows careful testing and evaluation of a network under normal and varying user-defined conditions. The measurement center consists of three components: an artificial traffic generator, a monitoring system, and data analysis software. The traffic generator emulates varied loads on the network, allowing for controlled experimentation and functional testing. The monitoring system captures measurement information about both artificial and normal network traffic. Analysis software summarizes this information into ten measurement reports following each monitoring period. Implementation issues and problems are discussed.