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

Question

Options

• AAutomatic unicast flooding is suppressed over the OTV link.
• BBPDUs are allowed to traverse the OTV link.
• CControl plane traffic is prevented from traversing the OTV link.
• DData plane traffic is prevented from traversing the OTV link.

• A
  94% (46)
• B
  4% (2)
• C
  2% (1)

Explanation

OTV (Overlay Transport Virtualization) extends Layer 2 VLANs across data centers over an IP underlay. A major bandwidth concern in L2 extension is unknown unicast flooding: in a standard L2 domain, frames with unknown destination MACs are flooded out all ports, including the OTV overlay link - wasting expensive WAN bandwidth. OTV suppresses automatic unicast flooding over the overlay by default (A). Instead of flooding, OTV uses a control-plane-based MAC learning mechanism (via IS-IS) to build a MAC address table for remote sites, so it can make informed forwarding decisions without flooding. Option B is incorrect - OTV blocks BPDUs by default to prevent spanning tree from crossing data centers. Options C and D are not accurate descriptions of OTV's default bandwidth-conservation mechanism.

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