Network Architecture Overview - LAN 101: Networking Basics | Tom's Hardware The architecture on which you choose to base your network is the single most important decision you make when setting up a LAN. The architecture defines the speed of the network, the medium access control mechanism it uses (for example, collision detection, token passing, and so on), the types of cables you can use, the network interface adapters you must buy, and the adapter drivers you install. The Institute of Electrical and Electronic Engineers (IEEE) has defined and documented a set of standards for the physical characteristics of both collision-detection and token-passing networks. Note: Be aware, however, that the colloquial names Ethernet and Token-Ring actually refer to earlier versions of these architectures, on which the IEEE standards were based. New Token-Ring installations are rare today and are not covered here. The most common choice today for new networks is Ethernet (both wired and wireless). New Token-Ring installations are rare today and are not covered here.
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Stretched Layer-2 Subnets in Azure « ipSpace.net blog Last Thursday morning I found this gem in my Twitter feed (courtesy of Stefan de Kooter) Greg Cusanza in #BRK3192 just announced #Azure Extended Network, for stretching Layer 2 subnets into Azure! As I know a little bit about how networking works within Azure, and I’ve seen something very similar a few times in the past, I was able to figure out what’s really going on behind the scenes in a few seconds… and got reminded of an old Russian joke I found somewhere on Quora: Have you heard that Ivanov won a thousand in a game of chess? In this particular case, it’s not layer-2 subnet but IP addresses, and it’s not new, but just a productized solution that people were implementing for years, and it comes with all the usual caveats that I’ve been talking about for a decade. So what’s really going on? Azure Extended Network does not stretch a layer-2 broadcast domain (that would be stupid) but a layer-3 IP subnet to implement not layer-2 clustering tricks but layer-3 IP mobility.