As mentioned in the introduction for this chapter, in previous chapters, all the references to the Internet Protocol referred to version 4 – the de facto standard used modern day networks. Internet Protocol version 6 is the recommended replacement for Internet Protocol version 4. The fact that the standard jumped from version 4 (IPv4) to version 6 (IPv6) often results in the question: what happened to version 5? The omission of IPv5 and the resultant standardization of IPv6 are described in the following section.
IPv5 is an experimental reservation protocol designed to provide Quality of Service (QoS) and is defined as . . .
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