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  1. cheriton

    CCDA

    Hope someone can help. I want to study for the CCDA certification but I know the exam (640-441) has just been retired.I have been told that the new exam is 640-861 but I can't find one study aid for this exam. Does anyone know if such a book exists yet?
  2. cheriton

    BER testing from router using ping.

    I have had a problem whereby I ber tested a leased line to a remote loop & it worked fine with most test patterns.However certain test patterns produced errors.The problem was eventually solved when the PTT replaced a section of the leased line that was a radio link.I would have thought that a...
  3. cheriton

    Test patterns over leased line.

    I have had a problem whereby I ber tested a leased line to a remote loop & it worked fine with most test patterns.However certain test patterns produced errors.The problem was eventually solved when the PTT replaced a section of the leased line that was a radio link.I would have thought that a...

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