Which mechanism is enabled by default in the OTV technology to conserve bandwidth?

Question

Options

• AControl plane traffic is prevented from traversing the OTV link
• BUnknown unicast flooding is suppressed over the OTV link.
• CBPDUs are allowed to traverse the OTV link
• DData plane traffic is prevented from traversing the OTV link.

• A
  2% (1)
• B
  95% (41)
• C
  2% (1)

Explanation

OTV (Overlay Transport Virtualization) extends Layer 2 domains across a Layer 3 WAN/IP core. In traditional bridged networks, frames destined for unknown MAC addresses are flooded out all ports. Flooding unknown unicasts across a WAN link would waste significant bandwidth. By default, OTV suppresses unknown unicast flooding over the OTV overlay link - it only forwards traffic when the destination MAC is known. OTV's control plane learns MAC-to-site mappings and distributes this via IS-IS, so flooding is unnecessary. Option A is incorrect because OTV does use control plane traffic (IS-IS) across the overlay. Option C is incorrect because OTV blocks BPDUs by default to prevent STP from running across sites. Option D is incorrect because OTV does forward known data plane traffic across the link.

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