300-420 Question 28
Single answerAn organization is designing a multi-protocol network where both IPv4 and IPv6 will be implemented. The network must support routing updates for both protocols across the same BGP session to ensure efficiency. Which address family configuration is required to achieve this goal?
- A
Enable the IPv4 address family only
- B
Enable the IPv6 address family only
- C
Enable the VPNv4 address family
- D
Enable both IPv4 and IPv6 address families
- E
Enable the L2VPN address family
Show answer and explanation
Correct answer: D
Explanation
To support both IPv4 and IPv6 routing updates over the same BGP session, the IPv4 and IPv6 address families must be enabled. This configuration ensures that the BGP process can handle routing information for both protocols efficiently. Other address families, such as VPNv4 or L2VPN, are specific to specialized use cases and do not meet the requirement of supporting standard IPv4 and IPv6 routing.
- A. Incorrect.
Enabling the IPv4 address family only allows BGP to exchange routing updates for IPv4 networks but does not support IPv6 routes.
- B. Incorrect.
Enabling the IPv6 address family only allows BGP to exchange routing updates for IPv6 networks but does not support IPv4 routes.
- C. Incorrect.
The VPNv4 address family is specific to MPLS VPNs and is not applicable to this scenario, as it does not handle standard IPv4 and IPv6 routing updates.
- D. Correct.
Enabling both IPv4 and IPv6 address families allows the BGP session to exchange routing updates for both protocols, meeting the requirement for supporting both IPv4 and IPv6 on the same session.
- E. Incorrect.
The L2VPN address family is specific to Layer 2 VPN configurations and does not handle IPv4 or IPv6 routing updates.