Discussion
Statement I: Sharing one network between functions of different criticality removes the need for partitioning.
Statement II: A fault in one function must be shown not to corrupt another sharing the medium.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
The second statement is right, and it refutes the first. Sharing a medium between functions of different criticality makes partitioning more necessary, not less: it must be shown that a fault in a low-criticality function cannot corrupt or delay a high-criticality one.
That is what traffic policing at the switches provides on an AFDX network - an end system transmitting faster than its allocation has its excess frames discarded at the first switch, so the fault is contained where it arises. Robust partitioning is the condition on which shared media are accepted at all.
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