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26xx. IP-VPN. H.Q. Branch1. ATU-R. L2 Switch. ATU-R. 17xx. L2 Switch. 17xx. Firewall. ATU-R. Internet. L2 Switch. 17xx. Branch2. ATU-R. ATU-R. 17xx. 17xx. Lease Line. ADSL. L2 Switch. L2 Switch. Ethernet. Branch3. Branch4. ISDN.
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26xx IP-VPN H.Q Branch1 ATU-R L2 Switch ATU-R 17xx L2 Switch 17xx Firewall ATU-R Internet L2 Switch 17xx Branch2 ATU-R ATU-R 17xx 17xx Lease Line ADSL L2 Switch L2 Switch Ethernet Branch3 Branch4 ISDN