The answer is degraded storage performance or instability. Using a non-recommended storage driver on a UCS B-Series blade server disrupts the validated driver-firmware compatibility that Cisco engineers into the UCS 6300 Series Fabric Interconnect and local SAS drive stack, leading to suboptimal I/O handling, increased latency, and potential system errors. On the Cisco DCCOR / CCNP Data Center Core 350-601 exam, this scenario tests your understanding of hardware-software validation in converged infrastructure, often appearing as a trap where candidates assume any driver will work or that the issue lies with the fabric interconnect itself. Remember the memory tip: “Driver mismatch, performance hitch”—if the driver isn’t on the Hardware Compatibility List, expect degraded throughput or instability, not a complete failure.
350-601 Compute Practice Question
This 350-601 practice question tests your understanding of compute. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A data center administrator is troubleshooting slow storage performance on a UCS B-Series blade server. The server is connected to a Cisco UCS 6300 Series Fabric Interconnect and uses local SAS drives. The administrator checks the UCS Manager and sees that the storage adapter has a driver version that is not recommended. What is the most likely impact of using a non-recommended driver version?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Degraded storage performance or instability
Using a non-recommended driver version for the storage adapter in a UCS B-Series blade server can lead to degraded storage performance or system instability. Cisco validates specific driver versions for compatibility with the UCS 6300 Series Fabric Interconnect and local SAS drives; deviations may cause suboptimal I/O handling, increased latency, or unexpected errors. This is a common issue in compute environments where driver- firmware mismatches affect storage throughput.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Degraded storage performance or instability
Why this is correct
Non-recommended drivers are not validated and can cause performance issues or system instability.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Loss of redundancy on the fabric interconnect
Why it's wrong here
Driver version does not affect fabric interconnect redundancy.
✗
Inability to boot the server
Why it's wrong here
A non-recommended driver may still allow boot, but performance could suffer.
✗
Increased security vulnerabilities
Why it's wrong here
Security vulnerabilities are possible but not the most likely impact of a non-recommended driver.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a 'non-recommended' driver (which causes performance or stability issues) versus a 'non-supported' driver (which could cause boot failure or complete non-functionality), tempting candidates to overestimate the impact.
Detailed technical explanation
How to think about this question
Under the hood, the storage adapter driver interacts with the SAS controller and the UCS Manager’s firmware to negotiate data transfer parameters such as queue depth, scatter-gather lists, and interrupt moderation. A non-recommended driver may lack optimizations for the specific SAS backplane or fail to handle error recovery correctly, leading to I/O timeouts or retries that manifest as performance degradation. In real-world scenarios, this often appears as intermittent slow disk access in VMware or database workloads, even though the hardware appears healthy.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Compute — This question tests Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Degraded storage performance or instability — Using a non-recommended driver version for the storage adapter in a UCS B-Series blade server can lead to degraded storage performance or system instability. Cisco validates specific driver versions for compatibility with the UCS 6300 Series Fabric Interconnect and local SAS drives; deviations may cause suboptimal I/O handling, increased latency, or unexpected errors. This is a common issue in compute environments where driver- firmware mismatches affect storage throughput.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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