CCNP CIT Exam Cram 2 (Exam Cram 642-831)

  1. show controllers serial Provides information on the interface status, cable types, missed datagrams, overruns, bad encapsulated frames , memory errors, underruns, clock rate, and bit errors.

  2. The "Interface Is Down; Line Protocol Is Down" troubleshooting steps:

    • Check the cabling.

    • Check that a carrier signal from a local provider exists.

    • Consider a hardware failure on the interface or CSU/DSU.

  3. The "Interface Is Up; Line Protocol Is Down" troubleshooting steps:

    • Check the interface configurations.

    • Check with the local provider to verify that it is not having line issues.

  4. debug serial interface Displays real-time information about serial interface events.

  5. clear counters serial Clears the counters for the serial interface.

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