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39 lines
925 B
Markdown
39 lines
925 B
Markdown
---
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title: "25-advanced-topics"
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aliases:
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tags:
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- cosc203
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- lecture
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---
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# Datacenter networks
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- 10's to 100's of thousands of hosts, often closely coupled, in close proximity
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- e-business :(e.g., amazon)
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- content servers: youtube etc
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- search engines, data mining (e.g., google)
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- challenges
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- multiple applications, each server many clients
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- reliability
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- managing/balancing load
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- procesing, networking, data bottlenecks
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network elements
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- server racks, 20-40 server blades: host
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- Top of Rack (TOR) switch
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- Tier 2 switches: connect to ~16 TORS below
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- tier 1 switches connect to ~16 T-2s below
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- border routers: connections outside
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- 
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- multipath communcation
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- rich interconnecitions so many routes
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- increased throughput
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- increased reliability through redundancy
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application-layer routing
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- load balancer: app-layer routing
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- recieves
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# Software Defined networks
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