5.2 Demonstrate Understanding of Routing and Forwarding Issue Resolution SD-WAN-ENGINEER Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   In SD-WAN, what is the role of path selection policies?

   • ATo configure the IP address of the router
   • BTo manage user authentication
   • CTo determine which path traffic should take based on application and link conditions
   • DTo set the encryption algorithm for the tunnel
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which tool is commonly used to isolate a routing issue by examining the path packets take?

   • Atraceroute
   • Bnetstat
   • Cping
   • Dnslookup
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A remote site reports intermittent connectivity to a data center application. You check the SD-WAN appliance and see that the tunnel to the data center is up, but the interface counters show a high number of 'input errors' on the LAN interface connected to the local switch. The tunnel encapsulation is IPsec. What is the most likely cause of the intermittent connectivity?

   • AThe local switch is sending BPDUs that are being misinterpreted by the SD-WAN appliance as routing updates.
   • BThe SD-WAN appliance is dropping packets because the IPsec encapsulation overhead exceeds the MTU on the WAN link.
   • CThe LAN interface is experiencing CRC errors or runts, indicating a physical layer or duplex mismatch issue.
   • DThe IPsec tunnel is failing to rekey, causing packets to be dropped during the rekey process.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which symptom is a clear indicator of an interface-level forwarding failure?

   • AThe interface is up but no packets are being forwarded
   • BThe SD-WAN tunnel is up and encapsulation is correct
   • CThe firewall policy allows the traffic
   • DThe routing table has a default route
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A network admin notices that traffic from a branch to a data center is taking a suboptimal path (going through a different hub) even though a direct path exists. The direct path has a lower latency and meets all SLAs. The admin checks the path selection policy and sees that the policy for this application is set to 'prefer hub'. What is the most likely reason for the suboptimal path?

   • AThe direct path's SLA is not being measured because the probe packets are blocked.
   • BThe hub is performing NAT, so the traffic must traverse the hub to reach the data center.
   • CThe 'prefer hub' policy is overriding the SLA-based path selection, forcing traffic through the hub.
   • DThe direct path is not advertised in the routing table due to a route filter.
   Reveal Solution Discussion Select an answer first