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300-610 · Question #324

A small company hosts several critical applications on bare-metal servers connected via iSCSI protocol to shared JBOD storage. One of the critical applications is experiencing latency issues, which th

The correct answer is A. class-map match-all iSCSI E. ip access-list extended iSCSI. You must first define an ACL that matches iSCSI traffic on TCP port 3260, so you can distinguish iSCSI from other traffic. Then create a class‑map referencing that ACL and apply a policy‑map that gives the iSCSI class a strict-priority queue (e.g. priority percent 50). This lets

Data Center Network Design

Question

A small company hosts several critical applications on bare-metal servers connected via iSCSI protocol to shared JBOD storage. One of the critical applications is experiencing latency issues, which the engineering team suspects is due to incorrect prioritization for iSCSI traffic. An engineer must update the network QoS settings to prioritize iSCSI traffic with these requirements:

  • iSCSI traffic must be prioritized.
  • The solution must be able to differentiate between different types of

iSCSI traffic.

  • The solution must be scalable because iSCSI traffic is expected to

increase in the future.

  • The solution must not disrupt other traffic.

Which two configurations must the engineer apply to the devices on the network to meet the requirements? (Choose two.)

Options

  • Aclass-map match-all iSCSI
  • Bpolicy-map QoS_Policy
  • Cpolicy-map QoS_Policy
  • Dip access-list extended iSCSI
  • Eip access-list extended iSCSI

How the community answered

(26 responses)
  • A
    85% (22)
  • B
    8% (2)
  • C
    4% (1)
  • D
    4% (1)

Explanation

You must first define an ACL that matches iSCSI traffic on TCP port 3260, so you can distinguish iSCSI from other traffic. Then create a class‑map referencing that ACL and apply a policy‑map that gives the iSCSI class a strict-priority queue (e.g. priority percent 50). This lets you both prioritize and differentiate iSCSI traffic without impacting other classes.

Topics

#iSCSI QoS#Traffic prioritization#Class-maps#Access-lists

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