Cisco Updated 400-007 Exam Questions and Answers by hasan

D: CWDM (Coarse Wavelength Division Multiplexing) shares parts of the same optical transmission window (1260–1625 nm) as DWDM but uses wider spacing between channels (typically 20 nm apart).

E: CWDM typically uses passive devices (multiplexers and demultiplexers) that require no electrical power, making deployment cost-effective.

Incorrect Options:

A: CWDM is better suited for shorter distances (up to ~80 km) and doesn ' t typically use optical amplifiers (EDFA). DWDM is better for long-haul with amplification.

B: 850 nm is used in multimode fiber systems (not CWDM).

C: CWDM supports up to 18 channels; DWDM supports up to 32 or more.

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C (NFV - Network Functions Virtualization):ETSI NFV framework allows virtualizing network functions (firewalls, load balancers, etc.) on standard hardware, promoting flexibility, cost reduction, and hardware independence.

Other options explained:

A: NPIV relates to Fibre Channel storage, not network virtualization.

B: NFVIS is Cisco ' s NFV infrastructure software, not the ETSI standard itself.

D: VNF refers to individual virtualized functions, not the framework.