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cisco - Whats's the function of a loopback interface in routing protocols? - Network Engineering Stack Exchange
Setting up a Loopback Address on a Cisco router - YouTube
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Basic Settings on a Router (1.1.3) > Cisco Networking Academy's Introduction to Routing Concepts | Cisco Press
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How to configure loopback interfaces on cisco router | Learn Linux CCNA CEH IPv6 Cyber-Security Online
