Answer C is correct.
From cisco:
VXLAN adds 50 bytes to the original packet. The common denominator and recommended MTU value available on devices operating in a fabric role is 9100. Network should have a minimum starting MTU of at least 1550 bytes to support the fabric overlay. MTU values between 1550 and 9100 are supported along with MTU values larger than 9100 though there may be additional configuration and limitations based on the original packet size.
MTU 9100 is provisioned as part of LAN Automation. Devices in the same routing domain and Layer 2 domain should be configured with a consistent MTU size to support routing protocol adjacencies and packet forwarding without fragmentation.
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
Ref: Cisco SD-Access – Connecting Multiple Sites in a Single Fabric Domain
“Cisco SD Access Transit Types
…
Cisco SD Access Multi Site
Key Considerations
…
Should accommodate the MTU setting used for SD Access in the campus network (typically 9100 bytes).
…”
A. 4464
Wrong answer.
B. 17914
Wrong answer.
C. 9100
Correct answer.
D. 1500
Wrong answer.
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