![]() ![]() Redundant paths in the network meant that a bridge could forward a frame in multiple directions. Building and expanding bridged networks was difficult because loops, where more than one path leads to the same destination, could result in the collapse of the network. It was required that the protocol should use a constant amount of memory when implemented on the network devices, regardless how large the network was. While working as a consulting engineer at the Digital Equipment Corporation (DEC) in 1984 she was tasked with developing a straightforward protocol which enabled network bridges to locate loops in a local area network (LAN). Perlman invented the spanning tree algorithm and the Spanning Tree Protocol (STP). Perlman is the recipient of awards such as Lifetime Achievement awards from Usenix and the Association for Computing Machinery’s Special Interest Group on Data Communication (SIGCOMM). She was a Fellow at Sun Microsystems and has taught courses at the University of Washington, Harvard University and MIT, and has been the keynote speaker at events all over the world. Perlman is the author of a textbook on networking and coauthor of another on network security. She is most famous for her invention of the Spanning Tree Protocol (STP), which is fundamental to the operation of network bridges, while working for Digital Equipment Corporation. Only when she saw other women students among a crowd of men she noticed that "it kind of looked weird". She later said that she was so used to the gender imbalance, that it became normal. When the men’s dorms at MIT became coed Perlman moved out of the women’s dorm into a mixed dorm, where she became the "resident female". To begin with MIT only had one women’s dorm, limiting the number of women students that could study. When studying at MIT in the late 60s she was one among the 50 or so women students, in a class of about 1,000 students. Her doctoral thesis at MIT addressed the issue of routing in the presence of malicious network failures. ![]() There she first got involved with designing network protocols. Perlman has been described as a pioneer of teaching young children computer programming.Īs a math grad at MIT she needed to find an adviser for her thesis, and joined the MIT group at BBN Technologies. During research performed in 1974–76, young children-the youngest aged 3½ years, programmed a LOGO educational robot called a Turtle. Working under the supervision of Seymour Papert, she developed a child-friendly version of the educational robotics language LOGO, called TORTIS ("Toddler's Own Recursive Turtle Interpreter System"). She was given her first paid job in 1971 as part-time programmer for the LOGO Lab at the (then) MIT Artificial Intelligence Laboratory, programming system software such as debuggers. (You can read more about Greenberg's take on SDN for the Cloud in his Microsoft blog post.As an undergraduate at MIT Perlman learned programming for a physics class. He earned the SIGCOMM Award for " pioneering the theory and practice of operating carrier and datacenter networks."Īt SIGCOMM 2015, the annual conference of the Association for Computing Machinery (ACM) Special Interest Group on Data Communication (SIGCOMM), Greenberg delivered his keynote address on the topic of "SDN for the Cloud." In other words, how software-defined networking powers Microsoft's Azure cloud platform. Greenberg has been a distinguished engineer and director of development for Microsoft Azure Networking for the past 5 years, and before that, was a principal researcher for Microsoft Research. Last week was a big one for Microsoft's Albert Greenberg: The networking expert delivered the keynote address at SIGCOMM 2015 in London AND received the annual SIGCOMM Award, recognizing lifetime contribution to the field of communication networks. ![]() Microsoft's Albert Greenberg (right) receives Lifetime Achievement Award at ACM SIGCOMM in London ![]()
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