301B: BIG-IP LTM Specialist: Maintain and TroubleshootDemo

By F5 · Question Mode

QuestionQ52

Identify and Resolve LTM Device Issues

An LTM Specialist needs to perform a packet capture on a virtual server that has a standard FastL4 profile applied. The virtual server, 10.0.0.1:443, is located on vlan301.

Which steps should the LTM Specialist take to successfully capture the data payload while ensuring that no other virtual servers are affected?

  • A The standard FastL4 profile should have PVA acceleration disabled. Then the packet capture tcpdump -ni vlan301 should be executed on the command line interface.
  • B The packet capture tcpdump -ni vlan301 should be executed on the command line interface. There is no need to change profiles or PVA acceleration.
  • C A new FastL4 profile should be created and applied to the virtual server with PVA acceleration disabled. Then the packet capture tcpdump -ni vlan301 should be executed on the command line interface.
  • D The LTM device is under light load. The traffic should be mirrored to a dedicated sniffing device. On the sniffing device, the packet capture tcpdump -ni
Explanation

FastL4 traffic may be offloaded to PVA/ePVA hardware, so a TMOS tcpdump can miss the payload after the flow is offloaded. Setting PVA acceleration to none keeps the traffic in software where tcpdump can capture it. Creating a separate FastL4 profile and applying it only to the target virtual server avoids changing every virtual server that inherits or uses the standard profile.

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