\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{shorttcircuitt (shortt\_circuitt)}
\pdfinfo{
  /Title (networking-interview-questions.pdf)
  /Creator (Cheatography)
  /Author (shorttcircuitt (shortt\_circuitt))
  /Subject (Networking Interview Questions 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{Networking Interview Questions Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{shorttcircuitt (shortt\_circuitt)} via \textcolor{DarkBackground}{\uline{cheatography.com/77499/cs/19027/}}}
\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}shorttcircuitt (shortt\_circuitt) \\
  \uline{cheatography.com/shortt-circuitt} \\
  \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 23rd May, 2020.\\
   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*}{2}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Socket}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Server}} & {\bf{Client}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Open & Open \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{Bind} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
Listen & Connect \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{Accept} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
Send/Recv & Send/Recv \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{ARP}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Maps an IP address to a MAC address.  \newline % Row Count 1 (+ 1)
Sender broadcasts an ARP request with the IP address to be mapped.  \newline % Row Count 3 (+ 2)
Owner of the IP address replies with its MAC address.% Row Count 5 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{3.04 cm} x{4.96 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{TCP}}  \tn
% Row 0
\SetRowColor{LightBackground}
Client & Server \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{SYN -\textgreater{}} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & \textless{}- SYN,ACK \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{ACK -\textgreater{}} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4.64 cm} x{3.36 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{802.11 Frame Types}}  \tn
% Row 0
\SetRowColor{LightBackground}
Association & Management \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Authentication & Management \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Probe & Management \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
Beacon & Management \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
RTS & Control \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
CTS & Control \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
ACK & Control \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
Data & Data \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.964 cm} p{1.368 cm} x{3.268 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{8.4cm}}{\bf\textcolor{white}{802.11 Client Association}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Client}} &  & {\bf{AP}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Probe Request & -{}-{}-{}--\textgreater{} &  \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & \textless{}-{}-{}-{}-- & Probe Response \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
Auth Request & -{}-{}-{}--\textgreater{} &  \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
 & \textless{}-{}-{}-{}-- & Auth Response \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
Assoc Request & -{}-{}-{}--\textgreater{} &  \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
 & \textless{}-{}-{}-{}-- & Assoc Response \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.44 cm} x{2.736 cm} x{2.304 cm} p{0.72 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{8.4cm}}{\bf\textcolor{white}{OSI Layers}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Application} & End User & HTTP, FTP, SSH, DNS & 7 \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{Presentation} & Encryption, Compression & SSL, TSL, MPEG & 6 \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Session & Authentication, Permissions & API's, Sockets & 5 \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{Transport} & Segment & TCP, UDP & 4 \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Network & Packets & IP, ICMP & 3 \tn 
% Row Count 9 (+ 1)
% Row 5
\SetRowColor{white}
Data Link & Frames, MAC & Ethernet, Bridge & 2 \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{Physical} & Media & Wireless, Cat5 & 1 \tn 
% Row Count 13 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}