SC-100 Practice Question: Order the steps to troubleshoot an Azure VPN…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  First, verify the Azure VPN gateway configuration and status in the Azure portal. Next, check the on-premises VPN device configuration and connectivity. Then, verify the shared key and IPsec/IKE parameters match. Finally, if issues persist, initiate a reset of the Azure VPN gateway.

  Why this is correct

  This is the correct order because troubleshooting should start with the Azure side (the service provider), then move to the on-premises device, and only after confirming configuration and keys should a reset be attempted as a last resort.

• ✗

  First, reset the Azure VPN gateway. Next, verify the on-premises VPN device configuration. Then, check the Azure VPN gateway status. Finally, regenerate the shared key.

  Why it's wrong here

  This is incorrect because resetting the gateway is a disruptive action that should be taken only after verifying both sides and keys. Starting with a reset can cause unnecessary downtime and may not resolve underlying configuration issues.

• ✗

  First, check the on-premises VPN device. Next, verify the Azure VPN gateway. Then, reset the on-premises device. Finally, update the shared key.

  Why it's wrong here

  This ordering is flawed because it begins on the on-premises side and, more critically, prescribes a reset of the on-premises VPN device before verifying that the Azure side is even functional — if the Azure gateway is misconfigured (e.g., wrong VPN type, incorrect local network gateway address, or missing route), the on-premises device will correctly report failures, and resetting it simply clears temporary states without addressing the root cause. A reset also forces re-establishment of Internet Key Exchange (IKE) security associations, which can cause unnecessary downtime for all tunnels through that device. The correct sequence is to first inspect the Azure VPN gateway's configuration and metrics in the portal, then validate the on-premises device's peer settings and connectivity, and only after both sides are confirmed to be using matching pre-shared keys and IPsec/IKE parameters should a reset be considered.

• ✗

  First, change the shared key. Next, reset the Azure VPN gateway. Then, check the on-premises device. Finally, verify the Azure gateway.

  Why it's wrong here

  This approach is disruptive and premature: altering the shared key on Azure without first confirming that the on-premises VPN device is already provisioned with the same key will actively break any existing tunnel, and a subsequent gateway reset will tear down all connections for 30–40 minutes while reinitializing the gateway instance. It also skips the diagnostic step entirely — you are changing a configuration variable before you have even checked whether the connection failure is due to a key mismatch, a route issue, an IPsec policy mismatch, or a physical link problem. In practice, a reset rarely resolves configuration faults; it simply restarts the gateway, and the same mismatch will reappear once the tunnel re-establishes, so you must verify both sides' shared key, IKE/SA policies, and network reachability before taking any remedial action.

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