What is the very first field in an IPv6 header?
Understand the Problem
The question is asking for information about the IPv6 header and specifically wants to know what the first field is. This involves knowledge of computer networking and the structure of the IPv6 protocol.
Answer
Version field
The first field in an IPv6 header is the Version field.
Answer for screen readers
The first field in an IPv6 header is the Version field.
More Information
The IPv6 header's Version field is 4 bits long and distinguishes this as an IPv6 packet by having a value of 6.
Tips
A common mistake is to confuse the IPv6 header with the IPv4 header where the first field is also the Version field, but represents the value 4.
Sources
- IPv6 Header Format - NetworkLessons.com - networklessons.com
- The IPv6 Header - IBM Documentation - ibm.com
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