What does the Virtual Extensible LAN (VXLAN) overlay solution provide?

The correct answer is B. Layer 2 overlay. VXLAN provides a Layer 2 overlay network by encapsulating Ethernet frames inside UDP packets, allowing Layer 2 segments to stretch across a Layer 3 IP network - making B correct. Option A (BGP overlay) is wrong because BGP is a routing protocol, not what VXLAN itself provides…

Campus and Data Center Design Elements

Question

Options

ABGP overlay
BLayer 2 overlay
CLayer 3 underlay
DIGP overlay

How the community answered

(34 responses)

A
12% (4)
B
79% (27)
C
3% (1)
D
6% (2)

Explanation

VXLAN provides a Layer 2 overlay network by encapsulating Ethernet frames inside UDP packets, allowing Layer 2 segments to stretch across a Layer 3 IP network - making B correct. Option A (BGP overlay) is wrong because BGP is a routing protocol, not what VXLAN itself provides, though BGP can be used to distribute VXLAN routes (EVPN). Option C (Layer 3 underlay) confuses the roles: the Layer 3 IP network is the underlay that VXLAN runs on top of, not what it provides. Option D (IGP overlay) is wrong because IGP (like OSPF/IS-IS) is also a routing protocol used in the underlay, not an overlay type.

Memory tip: Think "VX = Virtual eXtension of Layer 2" - VXLAN extends your Layer 2 broadcast domain over a Layer 3 fabric, so the overlay is always L2.

Topics

#VXLAN#Layer 2 overlay#network virtualization#data center fabric

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