Which statement about VXLAN is true?

Question

Options

• AVXLAN uses TCP 35 the transport protocol over the physical data cento network
• BVXLAN extends the Layer 2 Segment ID field to 24-bits. which allows up to 4094 unique Layer 2
• CVXLAN encapsulates a Layer 2 frame in an IP-UDP header, which allows Layer 2 adjacency
• DVXLAN uses the Spanning Tree Protocol for loop prevention.

• A
  4% (1)
• C
  88% (21)
• D
  8% (2)

Explanation

VXLAN Explanation

Option C is correct because VXLAN (Virtual Extensible LAN) works by encapsulating an entire Layer 2 Ethernet frame within a UDP/IP header (UDP port 4789), enabling Layer 2 segments to be stretched across a Layer 3 routed network - this is the core purpose and mechanism of VXLAN.

Why the distractors are wrong:

• A is incorrect because VXLAN uses UDP (not TCP) as its transport protocol, and the port is 4789, not 35
• B is partially misleading - while VXLAN does use a 24-bit Segment ID (VNID), this actually allows up to 16 million unique segments, not just 4,094 (4,094 is the limit of traditional VLANs using 12-bit IDs)
• D is incorrect because VXLAN specifically eliminates the need for Spanning Tree Protocol by running over a routed Layer 3 fabric, which is one of its key advantages over traditional VLANs

Memory Tip: Think of VXLAN as "wrapping" a Layer 2 letter inside a Layer 3 envelope - the UDP wrapper lets it travel across any IP network. Remember: "VXLAN = 24-bit VNI = 16 million segments" vs. "VLAN = 12-bit = 4,094 segments."

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