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Generic Routing Encapsulation is a tunnelling protocol, used to carry network layer protocols through encapsulation inside others.

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What does the notation F0/0 and F0/1 mean in this diagram?

@3iron's answer gave me the hint that I needed. The notation is denoting that there are multiple NIC interfaces on the router in the diagram and it's making reference to this. F0/0 - interface #1 F0 …
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