Error detection and correction

Internet checksum

The Internet checksum, also called the IPv4 header checksum is a checksum used in version 4 of the Internet Protocol (IPv4) to detect corruption in the header of IPv4 packets. It is carried in the IP packet header, and represents the 16-bit result of summation of the header words. The IPv6 protocol does not use header checksums. Its designers considered that the whole-packet link layer checksumming provided in protocols, such as PPP and Ethernet, combined with the use of checksums in upper layer protocols such as TCP and UDP, are sufficient. Thus, IPv6 routers are relieved of the task of recomputing the checksum whenever the packet changes, for instance by the lowering of the Hop limit counter on every hop. The Internet checksum is mandatory to detect errors in IPV6 UDP packets (including data payload). The Internet checksum is used to detect errors in ICMP packets (including data payload). (Wikipedia).

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From playlist Networking

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From playlist Communications & Network Systems

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An intro to the core protocols of the Internet, including IPv4, TCP, UDP, and HTTP. Part of a larger series teaching programming. See codeschool.org

From playlist The Internet

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The Internet is a global network that connects us to limitless information and opportunities. But there are risks involved with connecting to the Internet, such as downloading viruses and spyware onto computers and devices. Watch this video for four easy steps to help protect your computer

From playlist awareness

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the Internet (part 1)

An intro to the core protocols of the Internet, including IPv4, TCP, UDP, and HTTP. Part of a larger series teaching programming. See codeschool.org

From playlist The Internet

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An intro to the core protocols of the Internet, including IPv4, TCP, UDP, and HTTP. Part of a larger series teaching programming. See codeschool.org

From playlist The Internet

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From playlist Stanford CS105 - Introduction to Computers Full Course

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From playlist Error detection

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From playlist 26C3: Here be dragons day 1

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From playlist DEFCON 20

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From playlist Computer Science

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From playlist English Subtitles - aantonop Videos with subtitles in English

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From playlist Introduction to TCP/IP and Sockets

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From playlist Center for Applied Cybersecurity Research (CACR)

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From playlist Computer Literacy - (unit 4) - the internet

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From playlist Fun

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From playlist Discrete Structures, Spring 2022

Related pages

Checksum | Hexadecimal | Ones' complement | Header check sequence