That value is the id of the next protocol header right after Ethernet. The Ip4 header has a reserved id value of 0x800 for it. So anyone reading that packet has to look into that type field in order to determine the next protocol. When he does, 0x800 in that field tells him the next header is Ip4.
1 The Constitution contains no reference to any right to privacy. 2  However, over more than 100 years, courts have found a fundamental (but somewhat vague) right to privacy implicit in the Constitution.
In this landmark decision the Court declared that laws prohibiting abortion represented a violation of a women's right to privacy. While the right to privacy does to exist as such in the Constitution it has long been interpreted to exist as an umbrella created by the first 5 amendments in the Bill of Rights.