5.1 Explain the Process of Troubleshooting Connectivity Issues Between Sites SD-WAN-ENGINEER Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A branch site cannot reach a specific application at the data center. The routing table on the branch appliance shows the destination prefix with a next hop of a tunnel that is 'up'. You run a ping from the branch appliance to the application server and it fails. You then run a ping from the branch appliance to the data center gateway and it succeeds. What is the MOST likely cause?

   • AThe tunnel is not carrying the application's traffic.
   • BThe application server is down or not responding to ICMP.
   • CThe routing table on the data center appliance is missing a return route.
   • DThe branch appliance's firewall is blocking the application's traffic.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A retail company with 50 branch sites reports that users at the Denver branch cannot reach a critical application hosted at the Chicago headquarters. Users at other branches have no issues. The SD-WAN fabric shows both sites as 'connected' in the controller. You begin troubleshooting. What is the FIRST step you should take to isolate the problem?

   • ARun a continuous ping from the Chicago headquarters to the Denver branch's LAN gateway to test the tunnel.
   • BOpen a ticket with the ISP to check the status of the Denver branch's internet circuit.
   • CReview the Denver branch's routing table and forwarding decisions for the Chicago application's destination prefix.
   • DReboot the Denver branch SD-WAN appliance to clear any transient state that might be causing the issue.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   After applying a corrective action to fix a site-to-site connectivity issue, what is the final step an engineer should take?

   • AWait for the next scheduled maintenance window to test
   • BValidate that connectivity is restored by testing from the affected site
   • CReboot all devices to ensure the change takes effect
   • DDocument the change and close the ticket without testing
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A branch site reports that it cannot reach the data center. You check the SD-WAN appliance and see that the primary tunnel is 'down' and the secondary tunnel is 'up'. You run a ping from the branch appliance to the data center and it fails. What should you do NEXT?

   • ADisable the secondary tunnel to force traffic over the primary tunnel.
   • BCheck the routing table to see if traffic is being sent to the down primary tunnel instead of the up secondary tunnel.
   • COpen a ticket with the ISP to investigate the primary tunnel's failure.
   • DReboot the branch appliance to re-establish the primary tunnel.
   Reveal Solution Discussion Select an answer first
6. 5expert · hard

   A branch site is experiencing intermittent connectivity to the data center. The SD-WAN controller shows the tunnel as 'up' but with high packet loss. You need to determine if the packet loss is occurring on the WAN link or within the SD-WAN fabric. Which diagnostic approach would be MOST effective?

   • ARun a packet capture on the branch appliance's WAN interface and compare it with a packet capture on the data center appliance's WAN interface.
   • BReboot the branch appliance to clear any transient issues.
   • COpen a ticket with the ISP to check the WAN link.
   • DCheck the routing table on the branch appliance.
   Reveal Solution Discussion Select an answer first