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

Question

Options

• AFiltering unwanted NLRI from entering the AS.
• BFiltering NLRI based on AS Path or prefix-lists.
• CModifying the local preference of route advertisements.
• DSetting MED values of route advertisements.

• A
  6% (2)
• B
  11% (4)
• C
  6% (2)
• D
  77% (27)

Explanation

Setting MED (Multi-Exit Discriminator) values is an export policy action, not an import policy action. MED is advertised outbound to neighboring ASes to influence how external peers send traffic into your AS - it travels with route advertisements leaving your AS, making it inherently an export-side concern.

Why the distractors are wrong:

• A is a valid import policy - filtering unwanted NLRI (Network Layer Reachability Information) is a core reason to apply inbound route policies, dropping routes before they enter your routing table.
• B is a valid import policy - AS Path and prefix-list filtering are standard tools applied to incoming routes to control what your AS accepts.
• C is a valid import policy - Local Preference is set on received routes to tell iBGP peers which exit point to prefer; it's meaningless to external neighbors and only circulates within the AS.

Memory tip: Use the phrase "Local Pref IN, MED OUT" - Local Preference is set when routes come in (import), while MED is sent when routes go out (export). This cleanly separates the two most commonly confused BGP attributes on exam questions about policy direction.

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