CSCE 110 Lecture Notes - Lecture 8: Localhost, Leading Zero, Kilobit

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O(cid:374)e o(cid:396) (cid:373)o(cid:396)e leadi(cid:374)g ze(cid:396)oes f(cid:396)o(cid:373) a(cid:374)(cid:455) g(cid:396)oups of he(cid:454)ade(cid:272)i(cid:373)al digits a(cid:396)e (cid:396)e(cid:373)o(cid:448)ed; this is usuall(cid:455) do(cid:374)e to either all or none of the leading zeroes. For example, the group 0042 is converted to 42: co(cid:374)se(cid:272)uti(cid:448)e se(cid:272)tio(cid:374)s of ze(cid:396)oes a(cid:396)e (cid:396)epla(cid:272)ed (cid:449)ith a dou(cid:271)le (cid:272)olo(cid:374) (cid:894)::(cid:895). The dou(cid:271)le (cid:272)olo(cid:374) (cid:373)a(cid:455) o(cid:374)l(cid:455) (cid:271)e used once in an address, as multiple use would render the address indeterminate. Rfc 5952 recommends that a double colon not be used to denote a single section of omitted zeroes. E(cid:454)a(cid:373)ple of the (cid:396)ules a(cid:271)o(cid:448)e: afte(cid:396) (cid:396)e(cid:373)o(cid:448)i(cid:374)g all leadi(cid:374)g ze(cid:396)oes i(cid:374) ea(cid:272)h g(cid:396)oup, afte(cid:396) o(cid:373)itti(cid:374)g (cid:272)o(cid:374)se(cid:272)uti(cid:448)e se(cid:272)tio(cid:374)s of ze(cid:396)oes, the loop(cid:271)a(cid:272)k add(cid:396)ess, (cid:1004)(cid:1004)(cid:1004)(cid:1004):(cid:1004)(cid:1004)(cid:1004)0:0000:0000:0000:0000:0000:0001, may be abbreviated to ::1 by using both rules. Bytes, kilobytes, megabytes, and more: b(cid:455)te: (cid:1012) (cid:271)its, co(cid:373)(cid:373)o(cid:374) (cid:373)et(cid:396)i(cid:272) p(cid:396)efi(cid:454)es: Kilo (thousand, or 103), mega (million, or 106), giga (billion, or 109), and tera (trillion, or 1012), e. g. , kilobyte, or kbyte: but, (cid:373)et(cid:396)i(cid:272) p(cid:396)efi(cid:454)es also (cid:272)o(cid:373)(cid:373)o(cid:374)l(cid:455) used i(cid:374)a(cid:272)(cid:272)u(cid:396)atel(cid:455)

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