This is one of multiple CCNA Troubleshooting videos. Get $200 worth of network software for free here: https://goo.gl/613TUF
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Campus Troubleshooting Part 1: https://youtu.be/ZNelWyUdvW8
Proxy ARP: https://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/13718-5.html
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