These days I'm learning about configurations of routing protocols and route redistribution.
It take some time and energy to learn, but thinking about network protocols gives me great motivation, and not a small part of reason for living.

It's not easy to remember how to calculate metrics of some routing protocol.
It's a good idea to learn the formulas for routing protocols along with familiar examples like a FastEthernet interface, with 1000000kbps bandwidth and 100 microsecond delay.

Also this morning I compared the bandwidth the delay of various interfaces, physical and virtual, ethernet variations, serial, and tunnel interfaces. No wonder was I surprised a lot by the delay of VPN connection when I first used one.

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