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Network Design and Operations

Four 1 Gbps links between two switches are bundled into one logical link with link aggregation. Frames are distributed with the common method that chooses the link for each combination of source and destination addresses and port numbers (each flow). Which is closest to the maximum throughput a single TCP connection can achieve?

  1. A1 Gbps
  2. B2 Gbps
  3. C4 Gbps
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Answer: A. 1 Gbps

With link aggregation, frames belonging to the same flow are normally sent over the same single link. Splitting one flow's frames across several links could reorder them and hurt TCP performance. A single TCP connection is therefore limited to one link, 1 Gbps. When there are many flows they are spread over the four links, so up to 4 Gbps can be used in total. If one link fails, traffic continues on the remaining links, and STP sees the bundle as a single link, so none of its member links is blocked.

  • A. Correct. A flow is sent over a single link, so one link's bandwidth is the limit.
  • B. A single flow is never split across two links.
  • C. This is the total limit when there are many flows. A single connection cannot reach it.
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