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CV0-002 · Question #570

Network functions have been virtualized in private cloud space. A number of successful user functionality tests were executed, and a load test was run using less than 100 users. The virtual network el

The correct answer is A. Block the virtual network element from taking new traffic. Once isolated, schedule a load test and. When a virtualized network function fails severely after being added to a pool, the best troubleshooting approach is to isolate it to prevent further impact and allow focused diagnosis.

Troubleshooting

Question

Network functions have been virtualized in private cloud space. A number of successful user functionality tests were executed, and a load test was run using less than 100 users. The virtual network element was added into a pool of similar physical and virtual network functions. Each virtual function is licensed to handle 1.2 million subscribers. However, following the pool migration, less than 10% of the users of the virtualized network element are able to browse. Which of the following is the BEST approach to troubleshoot the issue?

Options

  • ABlock the virtual network element from taking new traffic. Once isolated, schedule a load test and
  • BKeep the virtual network element in the pool and start troubleshooting. The engineering capacity
  • COrchestrate another installation of second or third virtual network function, as needed, to add
  • DCheck on the IP address pool and ensure the virtual functions have the same number of IP

How the community answered

(37 responses)
  • A
    57% (21)
  • B
    24% (9)
  • C
    14% (5)
  • D
    5% (2)

Why each option

When a virtualized network function fails severely after being added to a pool, the best troubleshooting approach is to isolate it to prevent further impact and allow focused diagnosis.

ABlock the virtual network element from taking new traffic. Once isolated, schedule a load test andCorrect

Blocking the virtual network element from new traffic isolates the failing component, preventing further user impact and enabling a focused, in-depth troubleshooting session, including proper load testing, without affecting the rest of the pool.

BKeep the virtual network element in the pool and start troubleshooting. The engineering capacity

Keeping a severely malfunctioning network element in a live pool is risky as it continues to impact users and can complicate the troubleshooting process.

COrchestrate another installation of second or third virtual network function, as needed, to add

Orchestrating new virtual network function installations is a scaling action, not a troubleshooting step to diagnose the root cause of an existing VNF's failure.

DCheck on the IP address pool and ensure the virtual functions have the same number of IP

Checking IP address pools is a specific diagnostic step, but it is not the initial or best overall approach compared to isolating a severely failing component from production traffic.

Concept tested: Network troubleshooting and fault isolation

Topics

#network function virtualization#troubleshooting#load testing#isolation

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