How are policy direction and data flow related on the Alcatel-Lucent 7750 SR?

Question

Options

• AImport policies effect ingress data flow.
• BExport policies affect ingress data flow.
• CBoth import and export policies affect ingress data flow.
• DPolicy direction and data flow are independent.

• A
  3% (1)
• B
  83% (30)
• C
  6% (2)
• D
  8% (3)

Explanation

On the Alcatel-Lucent 7750 SR, export policies control which routes your router advertises to neighbors - when a neighbor learns those routes, it sends return traffic back to you, making that traffic ingress to your router. This inverse relationship (export policy → ingress data flow) is the core concept being tested.

Why the distractors are wrong:

• A is wrong because import policies govern which routes you accept from neighbors, determining where you forward traffic - that shapes your egress data flow, not ingress.
• C is wrong because only export policies create the ingress data flow link; the two directions are not symmetrical in their effect.
• D is wrong because the relationship is real and specific - policy direction and data flow are inversely coupled, not independent.

Memory tip: Think "advertise out, attract in." When you export routes (push them out), you attract return traffic flowing in (ingress). Flip it: you import routes to decide where your traffic goes out (egress). The policy direction and traffic direction are always opposite.

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