The equilibrium conditions state that the sum of the forces in any direction must be zero.
For segment AB, we have:
\[
\sum F_x = 0 \implies 8 - N_{AB} = 0 \implies N_{AB} = 8 \, \text{kN}
\]
For segment BC, we have:
\[
\sum F_x = 0 \implies 8 - 4 - N_{BC} = 0
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