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.
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)- A5% (2)
- B7% (3)
- C78% (32)
- D10% (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.
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.
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.
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.
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.
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
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