The answer is to implement QoS to give iSCSI traffic higher priority. This is correct because iSCSI operates over TCP, which is highly sensitive to jitter; when jitter causes packet delay variation, TCP interprets this as congestion and triggers retransmissions, severely degrading storage performance. QoS mitigates this by marking iSCSI frames with a higher CoS or DSCP value, ensuring they are queued and forwarded ahead of less time-sensitive traffic, directly reducing jitter-induced latency. On the Cisco DCCOR 350-601 exam, this question tests your understanding that jitter is a timing issue, not a bandwidth or redundancy problem—common traps include selecting jumbo frames (which improve throughput but not delay variation) or LAGs (which increase aggregate bandwidth but do not smooth out packet arrival times). Remember the memory tip: “Jitter is about timing, not trimming”—so prioritize QoS over jumbo frames or multipathing.
350-601 Storage Network Practice Question
This 350-601 practice question tests your understanding of storage network. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An iSCSI SAN is experiencing performance issues. The storage array and initiators are connected via a dedicated VLAN. The network team notices high jitter. What is the most effective mitigation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement QoS to give iSCSI traffic higher priority
Option A is correct because iSCSI depends on TCP; jitter causes retransmissions. QoS can prioritize iSCSI traffic to reduce jitter. Option B is incorrect because jumbo frames help throughput, not jitter. Option C is incorrect because LAGs improve bandwidth, not jitter. Option D is incorrect because multipathing is for redundancy, not jitter.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use multiple iSCSI sessions per initiator
Why it's wrong here
Incorrect: Sessions provide multipathing, not jitter control.
✗
Configure link aggregation between switches
Why it's wrong here
Incorrect: LAG provides more bandwidth, not jitter reduction.
✗
Enable jumbo frames on all switches
Why it's wrong here
Incorrect: Jumbo frames reduce overhead but do not fix jitter.
✓
Implement QoS to give iSCSI traffic higher priority
Why this is correct
Correct: QoS reduces jitter by prioritizing iSCSI traffic.
Related concept
Access ports place end devices into a single VLAN.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
Storage Network — This question tests Storage Network — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Implement QoS to give iSCSI traffic higher priority — Option A is correct because iSCSI depends on TCP; jitter causes retransmissions. QoS can prioritize iSCSI traffic to reduce jitter. Option B is incorrect because jumbo frames help throughput, not jitter. Option C is incorrect because LAGs improve bandwidth, not jitter. Option D is incorrect because multipathing is for redundancy, not jitter.
What should I do if I get this 350-601 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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