Which two technologies would be used to encapsulate frames to provide Layer 2 reachability across an IP fabric data center? (Choose two.)

Question

Options

• AMACsec
• BIPsec
• CMPLS
• DVXLAN

• A
  6% (1)
• B
  12% (2)
• C
  82% (14)

Explanation

MPLS and VXLAN are the two technologies used to encapsulate Layer 2 frames for transport across an IP fabric (underlay) in a data center. VXLAN (Virtual Extensible LAN) wraps Ethernet frames in UDP/IP packets, enabling Layer 2 segments to stretch across a Layer 3 routed fabric. MPLS achieves the same result by pushing label stacks onto frames, allowing Ethernet payloads to traverse IP/MPLS underlay networks - this is the basis of technologies like EVPN-MPLS.

Why the distractors are wrong:

• MACsec (A) encrypts traffic at Layer 2 between directly connected devices - it secures frames but does not tunnel or encapsulate them for transport across an IP fabric.
• IPsec (B) encrypts Layer 3 traffic between IP endpoints - it's a security/VPN protocol, not a Layer 2 encapsulation mechanism for fabric traversal.

Memory tip: Think "Layer 2 over Layer 3" - both VXLAN and MPLS are overlay technologies that let you carry Ethernet across a routed IP underlay. MACsec and IPsec are security protocols (the "sec" suffix is a hint) - they protect traffic rather than tunnel it across fabrics. If the question mentions "data center fabric" or "IP underlay," look for the overlay encapsulation technologies.

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