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

By Juniper · Question Mode

QuestionQ11

Configuration Basics

A customer plans to build a new data center using the QFX3000-M. The data center must support 30 high-traffic-volume host servers. Each server will be dual-connected to the fabric using two 40-Gbps links. The customer requires a 1:1 subscription ratio within the fabric.

How must the QFX3000-M be configured to satisfy the customer’s requirements?

  • A Use four QFX5100-24Q Interconnect chassis to which each of 30 QFX35000 nodes will be dual connected with two 40 Gbps FTE links to each QFX5100-24Q.
  • B Use four QFX3600-I Interconnect chassis to which each of eight QFX3600 nodes will be dual connected with two 40 Gbps FTE links to each QFX3600-I.
  • C Use eight QFX3600-I Interconnect chassis to which each of 16 QFX3600 nodes will be connected with a 40 Gbps FTE link to each QFX3600-I.
  • D Use four QFX3008-I Interconnect chassis to which each of 16 QFX3600 nodes will be dual connected with two 40 Gbps FTE links to each QFX3600-I.
Explanation

A non-oversubscribed QFX3000-M design using QFX3600 nodes requires sufficient 40-Gbps host-facing capacity and an equal amount of fabric uplink capacity. Eight QFX3600 nodes supply up to 64 40-Gbps host-facing connections, enough for 30 servers with two links each, while two 40-Gbps FTE links from every node to each of four QFX3600-I interconnects provide eight 40-Gbps uplinks per node. That gives 320 Gbps of fabric capacity per node, matching its 320 Gbps of host-facing capacity. Juniper documents that a QFX3600 node can use up to eight uplinks to QFX3600-I interconnects and that a QFX3000-M supports a maximum of four QFX3600-I interconnects.

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