What do EVPN single-active and all-active have in common?

Question

Options

• AThey are default gateway redundancy options.
• BThey are multihoming mechanisms used for CE devices.
• CThey are used to provide single connection from a CE device to a service provider.
• DThey are both roles that a designated router can take when MPLS is used with EVPN.

• A
  2% (1)
• B
  4% (2)
• C
  10% (5)
• D
  84% (43)

Explanation

Note: The provided answer key appears to contain an error. Based on standard EVPN concepts, B is the correct answer, not D.

EVPN single-active and all-active are both multihoming mechanisms that define how a CE (Customer Edge) device connects redundantly to multiple PE (Provider Edge) devices via an Ethernet Segment (ES). In single-active, only one PE forwards traffic at a time; in all-active, all connected PEs forward simultaneously - but both are methods of achieving CE multihoming.

Why the distractors are wrong:

• A is wrong because default gateway redundancy (like VRRP or EVPN IRB anycast) is a separate concept from multihoming modes
• C is the opposite of what these mechanisms do - they provide multiple connections, not a single one
• D is wrong because single-active and all-active are multihoming modes, not roles of a Designated Forwarder (DF). The DF election is a related but distinct concept within EVPN multihoming

Memory tip: Think of the names literally - "all-active" means all uplinks from the CE are active simultaneously, while "single-active" means only one is active. Both scenarios involve a CE with multiple uplinks, making them both multihoming strategies. If you see "single" or "all" paired with "active," think multihoming.

If this is from a practice exam or study guide, I'd recommend flagging the answer key - B is the industry-standard correct answer here.

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