Down Uplink Troubleshooting
A vSphere administrator notices that VMs on a specific ESXi host lose connectivity intermittently. The VMs are on a distributed switch port group. The administrator finds that the Uplink 1 on that host is down. What should the administrator do first?
Quick Answer
Checking the physical switch port configuration for the failed uplink is the right first step because troubleshooting should start at the most direct, most likely point of failure before making any changes to the virtual environment. An uplink reported down almost always has a physical-layer or physical-switch-side explanation, such as a disabled port, a misapplied VLAN or trunk setting, a bad cable, or a failed transceiver, and none of the virtual-switch-side fixes can actually resolve a link that is down for a physical reason. Options like adding more uplinks, changing the load-balancing algorithm, or reordering failover priority might reduce the symptom of intermittent connectivity by relying more heavily on the remaining working uplinks, but they leave the actual failed link unaddressed and do not explain why it went down in the first place. Diagnosing before reconfiguring is the more disciplined approach: understanding the physical switch port's state tells you whether this is a simple fix, like re-enabling a disabled port, or something requiring a hardware replacement or vendor escalation. Only once the true cause is understood does it make sense to consider whether any teaming or failover adjustments are also warranted as extra resilience going forward. Whenever a scenario reports a downed uplink and asks for the first troubleshooting step, favor diagnosing the physical connection and switch configuration over any virtual-switch workaround that merely routes around the failure.
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
✓
Check the physical switch port configuration for the failed uplink
The first step is to verify the physical switch port configuration for the failed uplink. The physical switch port may be misconfigured, disabled, or have a faulty cable. Checking this directly addresses the root cause of the down uplink. Option A (increasing uplinks) would be premature without understanding why the uplink failed. Option C (changing load balancing) and Option D (changing failover order) are potential workarounds but do not fix the down uplink itself. Therefore, the administrator should first check the physical switch port configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the number of uplinks in the teaming policy
Why it's wrong here
Adding more uplinks does not fix the existing down uplink issue.
- ✓
Check the physical switch port configuration for the failed uplink
Why this is correct
The physical switch port might be misconfigured, disabled, or have a faulty cable; this is the most direct troubleshooting step.
- ✗
Set the load balancing policy to Route based on source MAC
Why it's wrong here
Load balancing policy does not affect uplink state; it only distributes traffic among active uplinks.
- ✗
Configure a different failover order
Why it's wrong here
Changing failover order only affects which uplink is active but does not resolve the root cause of Uplink 1 being down.
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Same concept, more angles
1 more way this is tested on VCP-DCV
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. An administrator notices that two uplinks are down on the VDS. Which step should be taken first to restore redundancy?
hard- ✓ A.Check the physical switch ports and cables for uplink2 and uplink3.
- B.Increase the MTU to 9000 to improve performance.
- C.Disable LACP on the VDS to allow single-uplink operation.
- D.Remove the down uplinks from the VDS.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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