What is the benefit of fw ctl debug over fw ctl zdebug?

Question

Options

• AThere is no difference Both are used for debugging kernel
• BYou don't need timestamps
• CIt allows you to debug multiple modules at the same time
• DYou only need 1MB buffer

• A
  5% (2)
• B
  7% (3)
• C
  88% (38)

Explanation

fw ctl debug can target multiple kernel modules simultaneously by chaining debug flags (e.g., -m fw + drop conn), making it far more flexible for complex troubleshooting scenarios - that's what makes C correct. Option A is wrong because the two commands are meaningfully different: fw ctl zdebug is a simpler wrapper that drops output directly to the terminal for a single module without requiring manual buffer setup. Option B is incorrect because timestamps are a useful feature, not a drawback, and both commands can work with or without them depending on configuration. Option D is a distractor - buffer size (1MB vs larger) relates to buffer allocation flags, not a core distinguishing benefit of one command over the other.

Memory tip: Think of the "d" in fw ctl debug as standing for "diverse modules" - it's the full-featured, multi-module debugger, while fw ctl zdebug is the quick-and-dirty single-stream shortcut.

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