Implementing Cisco Application Centric Infrastructure (DCACI) — Question 47

Regarding the MTU value of MP-BGP EVPN control plane packets in Cisco ACI, which statement about communication between spine nodes in different sites is true?

Answer options

• A. By default, spine nodes generate 9000-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 9000-bytes packets.
• B. By default, spine nodes generate 1500-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 1800-bytes packets.
• C. By default, spine nodes generate 1500-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 1500-bytes packets.
• D. By default, spine nodes generate 9000-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 9100-bytes packets.

Correct answer: A

Explanation

The correct answer is A because, by default, spine nodes in Cisco ACI use 9000-byte packets for exchanging routing information, which means the Inter-Site network must support this size. Options B and C incorrectly state the packet size generated by the spine nodes, while option D mentions a larger capacity for the Inter-Site network than necessary.