300-610 DCID: Designing Cisco Data Center InfrastructureDemo

By Cisco · Question Mode

QuestionQ219

Network Design

A small business runs several critical applications on bare-metal servers that connect through the iSCSI protocol to shared JBOD storage. One critical application is seeing latency problems, and the engineering team suspects incorrect prioritization of iSCSI traffic. An engineer must update the network QoS configuration to prioritize iSCSI traffic with the following requirements:

  • iSCSI traffic must receive priority.
  • The solution must distinguish among different types of iSCSI traffic.
  • The solution must scale because iSCSI traffic is expected to grow in the future.
  • The solution must not interrupt other traffic.

Which two configurations must the engineer apply to network devices to satisfy the requirements?

Choose two
  • A class-map match-all iSCSImatch access-group name iSCSIpolicy-map QoS_Policyclass iSCSIpriority percent 50
  • B policy-map QoS_Policyclass class-defaultpriority percent 100police rate 100 mbps burst 5000 packets conform-action transmit exceed-action drop
  • C policy-map QoS_Policyclass class-defaultpriority percent 100
  • D ip access-list extended iSCSIpermit tcp any any eq 865
  • E ip access-list extended iSCSIpermit tcp any any eq 3260
Explanation

TCP port 3260 is the standard iSCSI listener port, so an extended ACL matching that port identifies iSCSI traffic for QoS classification. A class map that references this ACL, combined with a policy-map priority percent 50 action, gives the identified iSCSI class priority while capping its reserved share at 50 percent, leaving bandwidth for other traffic. Cisco iSCSI configuration documentation Cisco QoS configuration documentation

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