Cisco CCNA Certification Error Diagnosis Vs Error Recovery

Completing the CCNA, Intro, and ICND exam is focused on knowing and observing the important points. (That makes perfect sense, since learning to be a master networking supervisor or engineer is also about noticing the details!) One detail knows the main difference between error diagnosis and error recovery. As you move the terms are now and again used interchangeably, they may not be the same.

Error detection is merely that - error diagnosis only. Two typical error diagnosis methods are simply in the Data Link layer of the OSI model, the FCS (Frame Check Sequence) and CRC (Cyclical Redundancy Check). A mathematical equation is run from the data within the frame, and the outcome is sent combined with the data. The receiver runs the equation again, but this time around. If your result can be the identical, the frame is known as valid; if the result's different, the frame is considered corrupt and is also discarded.

Observe that the FCS and CRC do nothing at all in regards to retransmission. They're strictly error diagnosis schemes.

On an demonstration of error recovery, we look towards the Transport layer, where TCP runs. TCP performs reliable delivery, and also the reason it is called "reliable" is the fact that TCP uses sequence numbers to detect missing segments. When the sender determines from the sequence numbers that the remote host failed to receive transferred segments, the sender will retransmit the missing sections.

The important thing to keeping the terms straight in your mind is always to understand that while both error diagnosis and error recovery both detect problems, only error recovery does anything regarding it. It's also value reading an assessment question twice if you notice either term!

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