VCP-DCV Configure and Manage vSphere Networking Practice Question
An administrator has configured jumbo frames on a VDS and all physical switches. Virtual machines on different hosts can ping each other but cannot transfer files larger than 1500 bytes. What is the most likely cause?
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
✓
The virtual machine's operating system MTU is set to 1500.
Jumbo frames require the entire network path, including the virtual machine's operating system, to support the larger MTU. If the VM OS MTU is left at 1500, packets larger than 1500 bytes will be fragmented by the OS or dropped, preventing large file transfers. Option A is incorrect because the problem states physical switches and the VDS are configured for jumbo frames, but the physical NICs must also be configured; however, the question does not indicate they are misconfigured, and the issue is more likely the VM OS. Option B is incorrect because TCP offload engines typically handle segmentation and checksum, not fragmentation due to MTU mismatch. Option C is incorrect because VMkernel adapters are for management and vMotion traffic, not VM data traffic; VM data uses the VM's own network stack.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The physical NICs are not configured for jumbo frames.
Why it's wrong here
Physical NICs are configured.
- ✗
The TCP/IP offload engine is causing fragmentation.
Why it's wrong here
Offload engines do not cause this issue.
- ✗
The VMkernel adapters are not configured with MTU 9000.
Why it's wrong here
VMkernel adapters are for management traffic.
- ✓
The virtual machine's operating system MTU is set to 1500.
Why this is correct
The OS MTU must be 9000 for jumbo frames to work.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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