Which of the following descriptions about BGP4+ are correct? (Multiple choice)

Question

Options

• AThe NEXT _HOP attribute does not exist in BGP4+
• BBGP4+ carries the prefix and mask length of IPv6 routes through the MRI attribute.
• CBGP4+ carries the next hop address of the route through the Network Address of Next Hop in the
• DBGP4+ carries the next hop address of IPv6 routing through the NEXT HOP attribute.

• A
  77% (30)
• D
  23% (9)

Explanation

BGP4+ extends BGP-4 to support IPv6 by replacing the IPv4-specific NEXT_HOP attribute with the MP_REACH_NLRI (Multiprotocol Reachable NLRI) attribute - meaning A is correct: the traditional NEXT_HOP attribute simply does not exist in BGP4+. B is correct because the NLRI portion of the MP_REACH_NLRI attribute carries IPv6 route prefixes along with their prefix/mask lengths. C is correct because the MP_REACH_NLRI attribute contains a dedicated "Network Address of Next Hop" field, which is how BGP4+ communicates the IPv6 next-hop address.

D is wrong because it directly contradicts A and C - BGP4+ does not use the NEXT_HOP attribute for next-hop information; that role belongs to the "Network Address of Next Hop" field inside MP_REACH_NLRI.

Memory tip: Think of MP_REACH_NLRI as a single all-in-one attribute that does two jobs in BGP4+ - it carries the route prefixes (the NLRI part, answering B) and the next-hop address (the "Network Address of Next Hop" field, answering C) - eliminating the need for the old IPv4 NEXT_HOP attribute entirely (answering A).

No community discussion yet for this question.