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→Network Topology
== Network Topology ==
In Blacksburg, CNS has redundant fiber uplinks from the [[Andrews Information Systems Building]] to an Ashburn, Virginia and Atlanta, Georgia. The [[Mid-Atlantic Broadband Cooperative]] provides the two redundant 10 Gigabit connections to Ashburn, in addition to the unspecified connections to Atlanta. CNS's primary upstream router is located in Equinix's [[Ashburn, Virginia]] datacenter. At Equinix, CNS has about 4 Gbps aggregate bandwidth for commodity Internet from Cogent, as well as, through the [[Mid Atlantic Terascale Partnership]], connections to [[Network Virginia]], [[National LambdaRail]], and [[Internet2]].
From the Andrews Information Systems Building, there are redundant fiber connections to the main campus at both [[Burruss Hall]] and [[Cassell Colliseum]]. [[Owens Hall]], [[Hillcrest Hall]], and [[Shanks Hall]] have intermediate routers for some buildings. Nearly all ethernet portals on campus are capable of 100 Mbps or Gigabit speeds, due to fiber interconnects between buildings; however, intrabuilding wiring varies in age and may not support high speeds. The vast majority of campus IPv4s come from two directly-allocated blocks (128.173.0.0/16 and 198.82.0.0/16).