Which two methods in Cisco ACI are used for Layer 2 extension of a bridge domain or EPG to external devices? (Choose two.)

Question

Options

• ACreate an external bridged network to extend the entire bridge domain.
• BCreate a routed outside network connection using the OSPF protocol to extend the EPG.
• CCreate a routed outside network connection using the BGP to extend the entire bridge domain.
• DCreate a connectivity profile to external devices that include the bridge domain or EPG information.
• ECreate a static binding to a path (port + encap-ID) inside an EPG.

• A
  2% (1)
• B
  5% (3)
• C
  84% (47)
• E
  9% (5)

Explanation

Important note: The provided "correct answers" of C and D appear to be incorrect based on standard Cisco ACI documentation. The actual correct answers should be A and E.

Here's why:

A (correct) - An L2Out (External Bridged Network) is the standard ACI mechanism to extend an entire bridge domain as Layer 2 to external switches or devices. It keeps traffic in the same broadcast domain without routing.

E (correct) - A static path binding (port + VLAN encapsulation ID) inside an EPG is exactly how you extend an EPG to endpoints on external, non-VTEP-capable devices. This maps a physical port and VLAN to the EPG's policy.

Why C and D are wrong:

• C - A routed outside (L3Out) with BGP is a Layer 3 extension, not Layer 2. BGP here sets up IP routing, not bridge domain stretching.
• D - "Connectivity profile" is not a standard Cisco ACI term for L2 extension; this option is vague and doesn't map to a real ACI construct for this purpose.
• B - Same issue as C: OSPF-based L3Out is routing, not Layer 2 extension.

Memory tip: For L2 extension in ACI, think "Outside or Inside" - L2Out extends the BD outside the fabric, and static path binding extends the EPG to devices plugged into fabric ports. Both stay at Layer 2.

This question appears to come from an exam dump with an incorrect answer key - flag it if you're in a study group.

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