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Configuring Juniper Networks NetScreen and SSG Firewalls by Lisa Lorenzin, Anne Hemni, Chris Cantrell, Rob Cameron

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Border Gateway Protocol

One of the earliest tasks network administrators faced was how to cooperatively route traffic with networks that were out of their administrative control. RIP and OSPF seemed to work well for internal use, but did not offer the control features many engineers felt were needed to route traffic between separate organizations. The creation of BGP solved this problem by allowing engineers to determine how to route traffic not strictly on the shortest path, but on an agreed path. This may sound odd, but since the Internet is actually run mostly by companies (AT&T, Sprint, Verizon, and so on) these companies form agreements on how they can pass traffic, and in what volumes. BGP is also very scalable, which is obviously a key ...

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