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These allow the operator greater control over quality by cutting down the number of router hops the packets have to pass through and managing traffic flows to avoid congestion.
ECONOMIST: Internet telephony
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If you scale these communication patterns and now add to this, traffic which requires every device to talk to every other device across the whole switch network (which is often the case), multiple routes within the network are required to avoid congestion.
FORBES: Why the Cloud Needs a Network Decongestant
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Even with advances in GPS navigation, real-time traffic alerts and mapping, daily commute times are often unreliable, and relevant updates on how to avoid congestion often reach commuters when they are already stuck in traffic and it is too late to change course.
ENGADGET: IBM shows off Smarter Traveler traffic prediction tool