350-601 Compute Practice Question
A data center engineer is deploying a new application on Cisco UCS Manager. The application requires consistent low-latency access to storage. The engineer decides to use SAN boot from a Fibre Channel SAN. Which configuration change is necessary on the UCS service profile to enable SAN boot?
⚠ Common exam trap
Cisco often tests the distinction between vNIC (Ethernet) and vHBA (Fibre Channel) configurations, and the trap here is that candidates confuse MAC address persistence (for vNICs) with WWPN persistence (for vHBAs), leading them to incorrectly select Option C.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign a persistent WWPN to the vHBA
To enable SAN boot from a Fibre Channel SAN, the UCS service profile must assign a persistent WWPN to the vHBA. The WWPN is used by the Fibre Channel fabric to identify the initiator and to zone the storage LUNs; a persistent WWPN ensures that after a server reboot or vHBA reconfiguration, the same WWPN is presented to the SAN, allowing the boot LUN to remain accessible. Without a persistent WWPN, the vHBA would use a dynamically generated WWPN, which would break the SAN zoning and boot path.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable VIF (Virtual Interface) on the vHBA
Why it's wrong here
VIF is used in FCoE NPV mode, not for SAN boot.
- ✗
Configure a QoS policy for the vHBA
Why it's wrong here
QoS policy does not enable SAN boot.
- ✗
Set the vNIC to use dynamic MAC address
Why it's wrong here
Dynamic MAC is for LAN, not SAN boot.
- ✓
Assign a persistent WWPN to the vHBA
Why this is correct
Persistent WWPN ensures the SAN target recognizes the server.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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