Which of the following is true about the Ethernet FCS field?Question 6Select one:It is used for encryption.It is 2 bytes long.It resides in the Ethernet trailer, not the Ethernet header.Ethernet does not use FCS.
Question
Which of the following is true about the Ethernet FCS field?Question 6Select one:It is used for encryption.It is 2 bytes long.It resides in the Ethernet trailer, not the Ethernet header.Ethernet does not use FCS.
Solution
The correct answer is: It resides in the Ethernet trailer, not the Ethernet header.
Here's why:
The Ethernet Frame Check Sequence (FCS) is a four-byte (32 bit) field in an Ethernet frame. It is used to check the integrity of the packet and ensure it was not corrupted during transmission. The FCS is found in the Ethernet trailer, not the Ethernet header. This is because it is calculated based on the entire packet, and therefore must be placed at the end.
The other options are incorrect because:
- The FCS is not used for encryption. Its purpose is error detection, not security.
- The FCS is not 2 bytes long. It is 4 bytes long.
- Ethernet does use FCS. It is a fundamental part of the Ethernet protocol.
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