Lesson plan
Header check sequence
A header check sequence (HCS) is an error checking feature for various header data structures, such as in the media access control (MAC) header of Ethernet. It may consist of a cyclic redundancy check (CRC) of the frame, obtained as the remainder of the division (modulo 2) by the generator polynomial multiplied by the content of the header excluding the HCS field. The HCS can be one octet long, as in WiMAX, or a 16-bit value for cable modems.
Article summary
A header check sequence (HCS) is an error checking feature for various header data structures, such as in the media access control (MAC) header of Ethernet. It may consist of a cyclic redundancy check (CRC) of the frame, obtained as the remainder of the division (modulo 2) by the generator polynomial multiplied by the content of the header excluding the HCS field. The HCS can be one octet long, as in WiMAX, or a 16-bit value for cable modems.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.