JN0-411: Cloud, SpecialistDemo

By Juniper · Question Mode

QuestionQ19

Network Virtualization

Two virtual machines located in separate virtual networks cannot communicate with one another.

Which two troubleshooting steps would help identify the problem?

Choose two
  • A Ensure that the SDN gateway has the VRF or VRFs created for the two virtual networks.
  • B Ensure that there is a default route in each virtual network’s VRF.
  • C Ensure that there is a Contrail policy between the two virtual networks.
  • D Run the tcpdump command on the virtual machine’s tap interface.
Explanation

Contrail network policy exchanges routes between virtual networks and must include rules that allow traffic between them; without an explicit allow rule, the flow is unresolved or short and its packets are dropped. Capturing traffic with tcpdump on a VM’s tap interface verifies whether traffic is entering or leaving the VM-side interface, helping isolate the failure point. Juniper: Debugging Ping Failures for Policy-Connected Networks

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