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Network Model +-----------+ +-----------+ | | | | | Home | | Home | | Proxy | | Proxy | | | | | +-----------+ +-----------+ / \ / \ / \ / \ / \ / \ +-----------+ +-----------+ +-----------+ | | | | | | | Edge | | Edge | | Edge | | Proxy | | Proxy | | Proxy | | | | | | | +-----------+ +-----------+ +-----------+ / / \ \ / / \ \ / / \ \ / / \ \ / / \ \ +--------+ +--------+ +--------+ +--------+ | | | | | | | | | UA | | UA | | UA | | UA | | | | | | | | | +--------+ +--------+ +--------+ +--------+ |