Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 40

Which statement about VXLAN is true?

Answer options

• A. VXLAN encapsulates a Layer 2 frame in an IP-UDP header, which allows Layer 2 adjacency across router boundaries.
• B. VXLAN uses the Spanning Tree Protocol for loop prevention.
• C. VXLAN extends the Layer 2 Segment ID field to 24-bits, which allows up to 4094 unique Layer 2 segments over the same network.
• D. VXLAN uses TCP as the transport protocol over the physical data center network.

Correct answer: A

Explanation

The correct answer is A because VXLAN encapsulates Layer 2 frames within an IP-UDP header, facilitating Layer 2 adjacency across different networks. Option B is incorrect as VXLAN does not rely on Spanning Tree Protocol, and option C is wrong because VXLAN actually extends the Segment ID to 24-bits, allowing for more than 16 million segments. Option D is also incorrect since VXLAN typically uses UDP, not TCP, for transport.