What should be analyzed and correlated when troubleshooting a failure in BIG-IP APM to determine the root cause?

Question

Options

• ASession reports, session variables, and application response times
• BTCPdump data, APM log, and client-side error messages
• CBIG-IP system logs, SSL handshake details, and virtual server configurations
• DEPSEC status codes, session timeouts, and access policy configurations

• A
  13% (4)
• B
  59% (19)
• C
  6% (2)
• D
  22% (7)

Explanation

When troubleshooting BIG-IP APM failures, TCPdump, the APM log, and client-side error messages form the essential diagnostic triad because they cover all three layers of the problem: TCPdump reveals what's happening at the network/packet level, the APM log records how the access policy executed (authentication steps, policy evaluation, session creation), and client-side error messages confirm what the user actually experienced. Together, these three sources let you correlate a timeline from initial request to failure, pinpointing exactly where the breakdown occurred.

Why the distractors fall short:

• A is partially useful (session variables are valid APM data), but application response times are a performance metric, not a failure diagnostic tool, and TCPdump is omitted.
• C targets SSL/network layer issues, not APM-specific failures - virtual server configs are static configuration items, not diagnostic evidence.
• D is too narrow: EPSEC status codes only apply if the failure involves endpoint security checks, and access policy configurations are configuration artifacts rather than diagnostic output.

Memory tip: Think "TAC" - TCPdump, APM log, Client errors. These represent the three perspectives on any APM failure: the network sees it, the policy logs it, and the client reports it. Root cause lives where all three intersect.

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