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Chapter 6: IPv4 and IPv6 Headers > QUESTIONS FOR READERS

QUESTIONS FOR READERS

Figure 6.7 shows some of the concepts discussed in this chapter and can be used to help you answer the following questions.

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FIGURE 6.7 The IPv4 and IPv6 packet header fields. IPv6 can employ most IPv4 options as “next header” fields following the basic header.

1. Why are diagnostics like ping messages routinely given high hop-count values such as 64 or 128?

2. Without any IPv4 options in use, what value should be seen in the Header Length field most of the time?

3. How does an IP receiver detect missing fragments?

4. Is there any way for an IP receiver to determine how many fragments are supposed to arrive?

5. Since almost all the IPv4 header fields are options in IPv6, is it correct to say that the IPv6 header is “simplified”?


  

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