They should have called it a multi-access link. Wonderful technology, but I’m annoyed at the inventors for calling it a network. There are all sorts of nice fields that help the router move the data safely, like a hop count to notice when a packet might be in a loop. You need a layer 3 header (a protocol like IP, DECnet, IPX, etc.). To have a router move your data, you need to cooperate with it. Q: So what is the difference between a router, a bridge and a switch? They are discussed partially because they still exist and it’s getting increasingly difficult to find documentation for them, but also because there are some interesting ideas, both good and bad, and this knowledge is useful for designing future protocols.
I also added a bunch of older protocols, like IPX, Appletalk, and DECnet. Then I compare the solutions in all the deployed protocols and standards, as well as some variants I might suggest.
RADIA PERLMAN INTERCONNECTIONS HOW TO
So instead of looking at a big protocol like IP all at once, I look at a specific sub-problem, like how to find the maximum packet size you can use on a path to the destination. The point of the book is still to understand the concepts rather than just give the details of a bunch of protocols. It’s a complete rewrite, and now also significantly longer, since there’s a lot of extra material like IPv6, ATM, DCHP, VLANs, Fast Ethernet and switched Ethernet. Q: Is the 2nd edition much changed from the first? The idea is to help people understand it deeply not limited to the simplistic good or bad, but taking apart a protocol into the various problems it’s trying to solve and evaluating various ways of resolving each problem. So I wrote the book as a friendly way to learn about the field. I can’t imagine trying to understand the technology under these conditions, essentially from the specifications alone. It was a situation where anything coming out of committee X had to be bad and anything coming out of committee Y had to be good. There also was a disturbing trend to treat the field as religion, where you weren’t allowed to question or look at certain things critically. Some big mistakes were made, and then patched. Decisions were based on politics rather than understanding the implications of protocols. Committees reinvented the same stuff, with new terminology. Also, the field was getting more and more confusing. This was a natural topic for me to write about. I used to be the routing architect at Digital Equipment Corp., and it was my work that formed the basis of today’s routing and bridging protocols. She talks about her new book and shares the surprising story behind the invention of the spanning tree algorithm as well as its poetic counterpart, the algorhyme. In the following interview, Perlman reveals her ability to frame this complex and fascinating technology in reader-friendly terms. The new edition of Radia Perlman’s bestselling book, Interconnections, encompasses the many changes in the networking field since the first edition was published in 1992. Radia Perlman The Poetry of Protocols Radia Perlman Discusses Interconnections
To have a router move your data, you need to cooperate with it… Then along came the Ethernet. She has a PhD in computer science from MIT.In the beginning there were routers. She has been recognized with many industry honours including induction into the National Academy of Engineering, the Inventor Hall of Fame, The Internet Hall of Fame, Washington State Academy of Science, the 2023 IEEE Eric Sumner Award, and lifetime achievement awards from Usenix and SIGCOMM.
Radia is the author of the textbook “Interconnections” (about network layers 2 and 3) and co-author of “Network Security”. She has made contributions in network security, including scalable data expiration, distributed algorithms despite malicious participants and DDOS prevention techniques. She also invented the spanning tree algorithm, which transformed Ethernet from a technology that supported a few hundred nodes within a single building, to something that could support large networks. She developed the technology for making network routing self-stabilizing, largely self-managing, and scalable. Her specialties include network routing protocols and network security. Radia Perlman is a Fellow at Dell Technologies.
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