Level-3 (routing) cont..

• 1/4 of Class-B network is shielded from external Internet (IFZ)

• 1/4 of IR2 subnet is shielded from other SLAC subnets (SFZ)

• BSD subnets accessed via internal gateway

• MCC subnets accessed via internal gateways

• Critical MCC realtime network not routed - has dual-homed hosts to regulate access

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