Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature? (Choose two.)

Question

Options

• AIP multicast routes are not supported.
• BOutbound route filtering is configured only on a per-address family basis.
• COutbound route filtering can be configured for either iBGP or eBGP sessions.
• DThe outbound route filter can be defined in a Prefix list, Distribute list or Access lists.
• EOutbound route filtering is more effective when a distance vector IGP is used.

• A
  94% (16)
• C
  6% (1)

Explanation

BGP Prefix-Based ORF (Outbound Route Filtering) allows a router to send a prefix list to its BGP peer, instructing the peer to filter outbound updates before sending them, reducing unnecessary BGP traffic. A is correct: ORF for prefix-based filtering supports only IPv4 and IPv6 unicast address families; IP multicast routes (SAFI 2) are not supported with this ORF type. B is correct: ORF capability and prefix lists are configured under a specific address family (e.g., 'address-family ipv4 unicast'), making it inherently per-address-family. C is incorrect: while ORF can technically be used with iBGP, it is predominantly an eBGP optimization feature and its use with iBGP is limited and uncommon in standard implementations. D is incorrect: Prefix-Based ORF specifically uses only prefix lists, not distribute lists or access lists. E is incorrect: ORF efficiency is unrelated to the type of IGP in use.

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