Loopback Interface: A logical interface that can be use to test if the router is up. Note that a physical interface that is down does not mean that the entire router is down. Used in Cisco for intermediate and advance features.
http://www.networkliquidators.com/article-cisco-ccna-exam-tutorial-loopback-interfaces.asp
FastEthernet: a collective term for a number of Ethernet standards that carry traffic at the [...]
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