Which of the following is NOT considered an option of export policies?

Question

Options

• AAdvertising customer networks into BGP.
• BSending aggregates that summarize the AS s address space.
• CSending MEDs to influence ingress traffic from peers.
• DPreventing unwanted NLRI from entering the AS.

• A
  15% (8)
• B
  4% (2)
• C
  7% (4)
• D
  75% (41)

Explanation

Option D describes an import policy function, not an export policy. Preventing unwanted NLRIs (Network Layer Reachability Information) from entering your AS is about filtering what you accept inbound from neighbors - that's inbound/import policy territory.

The distractors are all genuinely export policy actions:

• A is wrong as a distractor because advertising customer networks into BGP is a classic export action - you're pushing routes out to peers.
• B is wrong as a distractor because sending aggregates is also outbound - you're summarizing and advertising your address space to neighbors.
• C is wrong as a distractor because MEDs are sent outbound to peers (export) to influence how traffic enters your AS - even though the goal is to shape ingress traffic, the mechanism is an export action.

Memory tip: Anchor on the word "entering" in option D - anything about routes entering your AS is an import policy concern. Export = what you send out; import = what you let in. If a policy option involves filtering inbound routes, it belongs to import policy, not export.

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