Quick Answer
The answer is hardware VLAN tagging and checksum offload. This feature offloads packet processing tasks such as VLAN insertion or stripping and checksum calculation from the host CPU to the Cisco UCS virtual interface card (VIC) adapter, directly reducing CPU overhead and minimizing latency for virtual machine traffic in a virtualized environment. On the Cisco DCCOR / CCNP Data Center Core 350-601 exam, this concept tests your understanding of how UCS hardware offload reduces packet processing latency by shifting repetitive network tasks to the adapter, a common trap being to confuse this with software-based offloading or assuming the host CPU must handle all packet processing. Remember the memory tip: “VIC does the VLAN and checksum, so the CPU can chill.”
This 350-601 practice question tests your understanding of compute. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 engineer is planning a Cisco UCS deployment for a virtualized environment. The requirement is to maximize performance for virtual machine traffic while minimizing latency. Which feature should be enabled on the UCS Manager to offload packet processing from the host CPU?
Data Center Ethernet (DCE) priority flow control
Why wrong: PFC is a flow control mechanism, not an offload.
vNIC failover policy
Why wrong: Failover is for redundancy, not performance.
Hardware VLAN tagging and checksum offload
These offloads reduce CPU utilization and improve throughput.
Fibre Channel over Ethernet (FCoE) offload
Why wrong: FCoE offload is for storage traffic, not general VM traffic.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Hardware VLAN tagging and checksum offload
Hardware VLAN tagging and checksum offload offloads packet processing tasks (VLAN insertion/stripping and checksum calculation) from the host CPU to the Cisco UCS virtual interface card (VIC) adapter. This reduces CPU overhead and minimizes latency for virtual machine traffic, directly meeting the requirement to maximize performance in a virtualized environment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Data Center Ethernet (DCE) priority flow control
Why it's wrong here
PFC is a flow control mechanism, not an offload.
vNIC failover policy
Why it's wrong here
Failover is for redundancy, not performance.
Hardware VLAN tagging and checksum offload
Why this is correct
These offloads reduce CPU utilization and improve throughput.
Related concept
Read the scenario before looking for a memorised answer.
Fibre Channel over Ethernet (FCoE) offload
Why it's wrong here
FCoE offload is for storage traffic, not general VM traffic.
Common exam traps
The trap here is that candidates confuse 'offload' with any feature that improves performance, but only hardware VLAN tagging and checksum offload directly offloads packet processing from the host CPU, while options like FCoE offload are storage-specific and not applicable to general VM traffic.
Detailed technical explanation
Under the hood, the Cisco UCS VIC adapter performs hardware VLAN tagging by inserting the 802.1Q tag into Ethernet frames and computing TCP/IP checksums (e.g., IPv4/TCP/UDP) in silicon, bypassing the host OS network stack. In a real-world scenario, enabling these offloads on a UCS Manager vNIC policy can reduce CPU utilization by up to 30% for heavy VM traffic, which is critical for latency-sensitive applications like VoIP or real-time databases.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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Compute — study guide chapter
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FAQ
Compute — This question tests Compute — Read the scenario before looking for a memorised answer..
The correct answer is: Hardware VLAN tagging and checksum offload — Hardware VLAN tagging and checksum offload offloads packet processing tasks (VLAN insertion/stripping and checksum calculation) from the host CPU to the Cisco UCS virtual interface card (VIC) adapter. This reduces CPU overhead and minimizes latency for virtual machine traffic, directly meeting the requirement to maximize performance in a virtualized environment.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.
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