OTV Failure Isolation: Three Main Functions | Cisco Exam 400-151

OTV Failure Isolation


Which three main functions are provided by OTV to achieve failure isolation? (Choose three.)



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A. B. C. D. E. F.


OTV (Overlay Transport Virtualization) is a technology used to extend Layer 2 connectivity between data centers over an IP-based network. It helps to isolate failures between different data centers so that issues in one data center do not impact the others. The three main functions provided by OTV to achieve failure isolation are:

  1. Unknown Unicast Traffic Suppression: OTV suppresses unknown unicast traffic to prevent flooding of traffic over the OTV overlay network. By doing so, OTV ensures that broadcast and multicast traffic is confined to its local domain and is not forwarded to other OTV sites. This helps to reduce unnecessary traffic and improve overall network performance.

  2. ARP Optimization: ARP optimization is used to reduce the ARP traffic generated by virtual machines (VMs) or servers. With OTV, ARP requests and responses are sent only to the data center where the destination MAC address is located. This helps to reduce the ARP traffic over the OTV overlay network and improve network efficiency.

  3. Use of Multiple OTV Overlays: OTV supports the use of multiple overlays, each of which is associated with a different VLAN or broadcast domain. By using multiple OTV overlays, OTV can provide fault isolation between different VLANs or broadcast domains. This helps to minimize the impact of network failures and isolate issues to a specific VLAN or broadcast domain.

The other options mentioned in the question are not directly related to failure isolation. Optimal outbound routing, unicast policy control, and Spanning Tree isolation are all important features of OTV, but they do not specifically address the issue of failure isolation.