quartz/content/notes/25-advanced-topics.md

title	aliases	tags
25-advanced-topics		cosc203 lecture

Datacenter networks

• 10's to 100's of thousands of hosts, often closely coupled, in close proximity
  • e-business :(e.g., amazon)
  • content servers: youtube etc
  • search engines, data mining (e.g., google)
• challenges
  • multiple applications, each server many clients
  • reliability
  • managing/balancing load
  • procesing, networking, data bottlenecks

network elements

• server racks, 20-40 server blades: host

• Top of Rack (TOR) switch

• Tier 2 switches: connect to ~16 TORS below

• tier 1 switches connect to ~16 T-2s below

• border routers: connections outside

• 

• multipath communcation

  • rich interconnecitions so many routes
  • increased throughput
  • increased reliability through redundancy

application-layer routing

• load balancer: app-layer routing
• recieves

Software Defined networks