JN0-1300: Data Center Design, Specialist (JNCDS-DC)Demo

By Juniper · Question Mode

QuestionQ1

Networking Fundamentals

A customer is deploying a new data center in a colocation facility and will occupy several racks throughout the environment. The racks are not close together and, in some cases, are located on different floors. Interconnected racks will never be more than 300 meters (925 feet) apart. Connections within the customer's environment are 10GbE and 40GbE. The customer's requirements include high-performance operations, future-proofing the connectivity design, and limiting the initial capital investment.

Which two recommendations would you make to the customer?

Choose two
  • A Use multimode fiber connections between all customer racks.
  • B Use single-mode fiber connections within a customer rack.
  • C Use DAC connections between all customer racks.
  • D Use DAC connections within a customer rack.
Explanation

Multimode fiber provides an appropriate high-performance, lower-initial-cost medium for inter-rack 10GbE and 40GbE links at this distance when paired with suitable optics. Cisco documents 40GBASE-CSR support for up to 300 m on OM3 multimode fiber and 400 m on OM4. Direct-attach copper (DAC) is a short-reach, low-cost connection well suited to devices within the same rack; it does not support the dispersed, up-to-300-meter inter-rack connections.

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