CCNA #045 Users cannot ping? Which layer of the OSI model broke?

CCNA #045 Users cannot ping? Which layer of the OSI model broke?

When a user has issues, you will need to troubleshoot the network and determine at which layer of the OSI model the problem occurred. Can you find it here? Get $200 worth of network software for free here: https://goo.gl/613TUF
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