\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{UmpaLumpa}
\pdfinfo{
  /Title (network.pdf)
  /Creator (Cheatography)
  /Author (UmpaLumpa)
  /Subject (Network Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Network Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{UmpaLumpa} via \textcolor{DarkBackground}{\uline{cheatography.com/46791/cs/13541/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}UmpaLumpa \\
  \uline{cheatography.com/umpalumpa} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 15th November, 2017.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{p{0.4977 cm} x{4.4793 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Net/Host ID by Class}}  \tn
% Row 0
\SetRowColor{LightBackground}
A & \seqsplit{0nnnnnnn.HHHHHHHH.HHHHHHHH.HHHHHHHH} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
B & \seqsplit{10nnnnnn.nnnnnnnn.HHHHHHHH.HHHHHHHH} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
C & \seqsplit{110nnnnn.nnnnnnnn.nnnnnnnn.HHHHHHHH} \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
D & \seqsplit{1110XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX} \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
E & \seqsplit{1111XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX} \tn 
% Row Count 10 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Three Way Handshake}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/umpalumpa_1510662412_3way-handshake.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Illustrates the Three way handshake used for TCP connections.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.68758 cm} x{2.28942 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{IEEE 802.xx}}  \tn
% Row 0
\SetRowColor{LightBackground}
802.3 & Ethernet \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
802.11a/b/g/n & WLAN \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
802.8 & Fiber Optic \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
802.15.1 & Bluetooth \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
802.15.1 & Bluetooth \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
802.16 & WiMAX \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4177 cm} x{0.8354 cm} x{1.33664 cm} x{1.58726 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{5.377cm}}{\bf\textcolor{white}{OSI Protocoll}}  \tn
% Row 0
\SetRowColor{LightBackground}
7 & \seqsplit{Applicationlayer} & DNS, DHCP, FTP, HTTP/S, SSH &  \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
6 & \seqsplit{Presentationlayer} & TLS &  \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
5 & \seqsplit{Sessionlayer} & NetBIOS, PPTP, SMB & Authentication, Authorization, Session restoration \tn 
% Row Count 10 (+ 4)
% Row 3
\SetRowColor{white}
4 & \seqsplit{Transportlayer} & TCP, UDP, iSCSI &  \tn 
% Row Count 12 (+ 2)
% Row 4
\SetRowColor{LightBackground}
3 & \seqsplit{Networklayer} & IPv4, IPv6, IPSec & Router \tn 
% Row Count 14 (+ 2)
% Row 5
\SetRowColor{white}
2 & \seqsplit{Data-Link-Layer} & PPP, ARP, MAC, VLAN & Switch, Bridge,  Repeater \tn 
% Row Count 16 (+ 2)
% Row 6
\SetRowColor{LightBackground}
1 & \seqsplit{Physical} Layer & DSL, ISDN, USB, Bluetooth & HUB \seqsplit{(Multiportrepeater)} \tn 
% Row Count 19 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}