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английский) 1:
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The lower layer service provisioning may cross a domain boundary provided by a service pro-vider. For example, Verizon may use a WDM Layer 1 facility to facilitate customers ' ATM or SONET, MPLS subscriptions. Therefore, company A may have a nation-wide network by using MPLS lease lines to connect multiple sites and company B may use a ATM leased circuit to connect to an IXP (Figure 8.25). Both of them may use the same Layer 1 provision by Verizon.
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