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400-007 · Question #43

Which two possible drawbacks should you consider when introducing Network Functions Virtualization in a network design? (Choose two)

The correct answer is C. High-end routers are required to support NFV E. An SDN orchestration layer is required to support NFV. NFV introduces dependencies on high-performance compute platforms and a management orchestration layer that represent real drawbacks when incorporating NFV into a network design.

Designing Network Infrastructure

Question

Which two possible drawbacks should you consider when introducing Network Functions Virtualization in a network design? (Choose two)

Options

  • ABandwidth utilization increases
  • BTraffic flows are suboptimal
  • CHigh-end routers are required to support NFV
  • DOpenFlow must be supported in the network
  • EAn SDN orchestration layer is required to support NFV

How the community answered

(41 responses)
  • A
    5% (2)
  • B
    7% (3)
  • C
    78% (32)
  • D
    10% (4)

Why each option

NFV introduces dependencies on high-performance compute platforms and a management orchestration layer that represent real drawbacks when incorporating NFV into a network design.

ABandwidth utilization increases

NFV does not inherently increase bandwidth utilization; it changes where and how traffic is processed but does not add traffic to the network by design.

BTraffic flows are suboptimal

While suboptimal traffic flows are possible in some NFV deployments, this is a configuration outcome rather than a fundamental or universally applicable drawback of introducing NFV into a design.

CHigh-end routers are required to support NFVCorrect

Virtualizing network functions requires server or routing platforms with substantial CPU, memory, and fast I/O capabilities - equivalent to high-end hardware - to match the throughput and latency that purpose-built ASICs deliver in traditional network appliances.

DOpenFlow must be supported in the network

NFV does not require OpenFlow; OpenFlow is a southbound SDN protocol independent of NFV, which can be deployed with or without SDN control plane protocols.

EAn SDN orchestration layer is required to support NFVCorrect

NFV depends on an orchestration and management framework - defined by the ETSI NFV MANO architecture including the NFV Orchestrator, VNF Manager, and Virtual Infrastructure Manager - which adds significant architectural complexity and a new operational dependency to the network design.

Concept tested: NFV infrastructure requirements and orchestration drawbacks

Source: https://www.etsi.org/technologies/nfv

Topics

#NFV#network virtualization#SDN orchestration#hardware requirements

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