Section 1.4 WAN Switching.

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The WAN links must rely on a layer 2 protocol that supports link negotiation and authentication.
The Service provider expects both R18 and R19 to complete three-way handshake by providing the expected response of a challenge that is sent by AS 20003 Router.

R18 must use the username ACME-R18 and password CCIE

R19 must use the username ACME-R19 and password CCIE
 
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