Which of the following is true about the Ethernet FCS field?
- Ethernet uses FCS for error recovery.
- It is 2 bytes long.
- It resides in the Ethernet trailer, not the Ethernet header.
- It is used for encryption.
Explanation: The 4-byte Ethernet FCS field, found in the Ethernet trailer, allows the receiving node to see what the sending node computed with a math formula that is a key part of the error-detection process. Note that Ethernet defines the process of detecting errors (error detection), but not error recovery.
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