A network is experiencing a number of CRC errors during normal network communication.
At which of the following layers of the OSI model will the administrator MOST likely start to troubleshoot?
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A. B. C. D. E. F. G.B.
CRC (Cyclic Redundancy Check) errors occur when data is corrupted during transmission. The receiving device detects this error by calculating a checksum on the received data and comparing it to the checksum sent with the data. If the two values do not match, a CRC error is reported.
When CRC errors occur, the network administrator will typically start troubleshooting at the layer where the error is most likely to occur. In this case, the administrator should start at Layer 2, the Data Link layer, as this is the layer where most CRC errors occur.
The Data Link layer is responsible for transmitting data between devices on the same network segment. This layer includes two sublayers: the Media Access Control (MAC) sublayer and the Logical Link Control (LLC) sublayer.
CRC errors can occur at the MAC sublayer due to issues with the physical layer, such as cable problems, faulty network interface cards (NICs), or problems with the connectors. At the LLC sublayer, CRC errors can occur due to issues with the data being sent, such as improper framing or incorrect packet length.
If the problem is not resolved at Layer 2, the administrator may need to move up the OSI model to Layer 3, the Network layer. At this layer, the administrator will look for issues such as incorrect addressing or routing problems that may be causing the CRC errors.
In summary, the administrator will most likely start troubleshooting at Layer 2, the Data Link layer, when CRC errors are occurring during network communication. If the problem persists, the administrator may move up the OSI model to Layer 3, the Network layer, to further investigate the issue.