This is one of multiple GNS3 labs videos. In this video we troubleshoot a PPP Mulitlink issue.

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Tasks:
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Troubleshoot the network.

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IOS used: c3725-adventerprisek9-mz.124-15.T14.bin
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GNS3 Topology:
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https://goo.gl/Yeea9P

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Resources:
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https://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10313-config-pap.html
https://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html