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Bookmark or Share- Why is the ethernet payload fixed between 46 and 1500 bytes?After subtracting 18 bytes for the ethernet header and CRC, you get 46 bytes of Ethernet payload as the minimum payload size. Slot time (and thus the minimum frame size) is also closely related to Ethernet collision detection. Quoting An Introduction to Computer Networks, paragraph 2.1.2:
- layer1 - Minimum ethernet frame is 64 bytes, Why the payload must be ...The original ethernet standard also specified 14 bytes for the header, and 4 bytes for the frame check sequence. That is 18 bytes. subtract 18 from 64, and you get 46 as the minimum payload. Since then, you can add a four byte VLAN tag. So, with the VLAN tag, the minimum payload size is 42. Without the VLAN tag, the minimum payload size remains 46.
- Why was the MTU size for ethernet frames calculated as 1500 bytes?Thus, the payload of ISO 802.2 LLC frames (such as ISIS or Spanning-Tree) should not exceed 1500 bytes. Other Ethernet protocols (such as Ethernet II DIX) unofficially can exceed 1500 bytes as long as their Ethernet PHY-layer doesn't depend on CSMA/CD. Longer story. A lot depends on the Ethernet protocols in question.
- What is the NO PAYLOAD ENCRYPTION version of the IOS software?To satisfy the import requirements of those countries, the `npe' universal image does not support any strong payload encryption. This image supports security features like Zone-Based Firewall, Intrusion Prevention through SECNPE-K9 license.
- What does the term "Payload" mean in programmingThe payload does not include the "overhead" data required to get the packet to its destination. Note that what constitutes the payload may depend on the point-of-view. To a communications layer that needs some of the overhead data to do its job, the payload is sometimes considered to include the part of the overhead data that this layer handles.
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