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300-610 · Question #24

Which two statements about OTV are true? (Choose two.)

The correct answer is B. OTV supports authentication of hello messages and control plane PDUs. F. OTV propagates MAC address reachability information via the underlying IS-IS control-plane.. OTV (Overlay Transport Virtualization) supports authentication of its control plane messages for secure communication and propagates MAC address reachability information using an underlying IS-IS control plane. This design ensures secure and efficient Layer 2 extension between da

Data Center Network Design

Question

Which two statements about OTV are true? (Choose two.)

Options

  • AOTV join interfaces must be physical interfaces.
  • BOTV supports authentication of hello messages and control plane PDUs.
  • CMulticast support in the transport network is a strict requirement to establish OTV adjacencies.
  • DAll OTV overlay interfaces must use the same join interface.
  • EOTV forwards and processes spanning-tree BPDUs between sites to ensure a loop-free topology.
  • FOTV propagates MAC address reachability information via the underlying IS-IS control-plane.

How the community answered

(61 responses)
  • A
    2% (1)
  • B
    93% (57)
  • C
    2% (1)
  • E
    3% (2)

Why each option

OTV (Overlay Transport Virtualization) supports authentication of its control plane messages for secure communication and propagates MAC address reachability information using an underlying IS-IS control plane. This design ensures secure and efficient Layer 2 extension between data centers.

AOTV join interfaces must be physical interfaces.

OTV join interfaces can be logical interfaces, such as loopback interfaces, which are often recommended for their stability and resilience, not strictly physical interfaces.

BOTV supports authentication of hello messages and control plane PDUs.Correct

OTV incorporates security mechanisms to authenticate hello messages and control plane PDUs using protocols like MD5 or SHA-1, ensuring that only authorized OTV edge devices can establish adjacencies and exchange critical control information.

CMulticast support in the transport network is a strict requirement to establish OTV adjacencies.

OTV does not strictly require multicast support in the transport network; it can also operate in unicast-only transport environments for both its control and data planes.

DAll OTV overlay interfaces must use the same join interface.

OTV overlay interfaces do not all need to use the same join interface; an OTV edge device can have multiple join interfaces for redundancy or specific routing requirements.

EOTV forwards and processes spanning-tree BPDUs between sites to ensure a loop-free topology.

OTV explicitly prevents the forwarding and processing of Spanning Tree Protocol (STP) BPDUs between sites to create independent Layer 2 domains and avoid inter-site loops, which is a fundamental aspect of its design.

FOTV propagates MAC address reachability information via the underlying IS-IS control-plane.Correct

OTV utilizes an internal IS-IS (Intermediate System-to-Intermediate System) routing protocol as its control plane to efficiently advertise and learn MAC address reachability information from local site VLANs to remote OTV sites, facilitating optimal data forwarding.

Concept tested: OTV protocol characteristics

Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-584707.html

Topics

#OTV#Data Center Interconnect#Layer 2 extension

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