The Packet Walk Comes First - Network Security Part 1
Network security is controls placed where traffic must pass. Part 1 builds the floor: addressing, switching, routing, and your first enforcement reps.
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Practice at Home the Way You Preach at Work
I spend my working hours telling teams how to do security well. Segment the network. Write the change down. Model the threat before you build the control. Then I go home, and if I am honest with myself, the temptation is to cut every one of those corners because it is "just the lab."