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% Packages
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\usepackage{hhline}             % Border under tables
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%\usepackage[utf8x]{inputenc}    % For unicode character support
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\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{King Dibz (King Dibz)}
\pdfinfo{
  /Title (computer-networking-basics.pdf)
  /Creator (Cheatography)
  /Author (King Dibz (King Dibz))
  /Subject (Computer Networking Basics Cheat Sheet)
}

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% This two commands together give roughly
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% 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
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\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{Computer Networking Basics Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{King Dibz (King Dibz)} via \textcolor{DarkBackground}{\uline{cheatography.com/215358/cs/46922/}}}
\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}King Dibz (King Dibz) \\
  \uline{cheatography.com/king-dibz} \\
  \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 August, 2025.\\
   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{tabularx}{17.67cm}{x{3.374 cm} x{2.1931 cm} x{11.3029 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Network Protocols}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Protocol}} & {\bf{Port}} & {\bf{Description}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
SSH & 22 & Secure Shell protocol used for secure remote access and file transfer. \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
FTP & 20/21 & File Transfer Protocol used for transferring files between computers. \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
SMTP & 25 & Simple Mail Transfer Protocol used for sending email messages between servers. \tn 
% Row Count 11 (+ 3)
% Row 4
\SetRowColor{LightBackground}
DNS & 53 & Domain Name System protocol used for translating domain names into IP addresses. \tn 
% Row Count 15 (+ 4)
% Row 5
\SetRowColor{white}
DHCP & 67/68 & Dynamic Host Configuration Protocol used for assigning IP addresses to devices on a network. \tn 
% Row Count 19 (+ 4)
% Row 6
\SetRowColor{LightBackground}
HTTP & 80 & Hypertext Transfer Protocol used for web browsing. \tn 
% Row Count 21 (+ 2)
% Row 7
\SetRowColor{white}
POP3 & 110 & Post Office Protocol (ver. 3) used for retrieving email messages from a mail server. \tn 
% Row Count 25 (+ 4)
% Row 8
\SetRowColor{LightBackground}
IMAP & 143 & Internet Message Access Protocol used for retrieving email messages and managing mailboxes on a mail server. \tn 
% Row Count 30 (+ 5)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{3.374 cm} x{2.1931 cm} x{11.3029 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Network Protocols (cont)}}  \tn
% Row 9
\SetRowColor{LightBackground}
SNMP & \seqsplit{161/162} & Simple Network Management Protocol used for managing and monitoring network devices. \tn 
% Row Count 4 (+ 4)
% Row 10
\SetRowColor{white}
HTTPS & 443 & HTTP over SSL/TLS encrypted protocol for secure web browsing. \tn 
% Row Count 7 (+ 3)
% Row 11
\SetRowColor{LightBackground}
TCP & - & Transmission Control Protocol used for establishing reliable connections between devices on a network. \tn 
% Row Count 11 (+ 4)
% Row 12
\SetRowColor{white}
UDP & - & User Datagram Protocol used for establishing unreliable connections between devices on a network. \tn 
% Row Count 15 (+ 4)
% Row 13
\SetRowColor{LightBackground}
ICMP & - & Internet Control Message Protocol used for error reporting and diagnostic messages. \tn 
% Row Count 19 (+ 4)
% Row 14
\SetRowColor{white}
ARP & - & Address Resolution Protocol used for mapping IP addresses to MAC addresses. \tn 
% Row Count 22 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{1.8117 cm} x{2.3058 cm} x{5.4351 cm} x{6.9174 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{17.67cm}}{\bf\textcolor{white}{OSI Model}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Layer}} & {\bf{Name}} & {\bf{Protocol Data Unit (PDU)}} & {\bf{Protocols}} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
7 & \seqsplit{Application} & Data & HTTP, FTP, SSH, DNS \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Provides user interfaces and support for services such as email, file transfer, and network printing.} \tn 
% Row Count 9 (+ 3)
% Row 3
\SetRowColor{white}
6 & \seqsplit{Presentation} & Data & SSL, SSH, IMAP, MPEG, JPEG \tn 
% Row Count 12 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Formats and encrypts data for transmission.} \tn 
% Row Count 14 (+ 2)
% Row 5
\SetRowColor{white}
5 & \seqsplit{Session} & Data & APIs, Sockets \tn 
% Row Count 16 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Manages connections between applications.} \tn 
% Row Count 18 (+ 2)
% Row 7
\SetRowColor{white}
4 & \seqsplit{Transport} & Segment & TCP, UDP \tn 
% Row Count 20 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Provides reliable, end-to-end data delivery and error recovery.} \tn 
% Row Count 22 (+ 2)
% Row 9
\SetRowColor{white}
3 & \seqsplit{Network} & Packet & IP, ICMP, IPSec, IGMP \tn 
% Row Count 24 (+ 2)
% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Determines the best path for data transmission and performs logical addressing.} \tn 
% Row Count 26 (+ 2)
% Row 11
\SetRowColor{white}
2 & Data Link & Frame & Ethernet, PPP, Switch \tn 
% Row Count 28 (+ 2)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Transfers data between network devices and manages physical addressing.} \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{1.8117 cm} x{2.3058 cm} x{5.4351 cm} x{6.9174 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{17.67cm}}{\bf\textcolor{white}{OSI Model (cont)}}  \tn
% Row 13
\SetRowColor{LightBackground}
1 & \seqsplit{Physical} & Bit & Fiber, Access Points, Copper Cabling \tn 
% Row Count 3 (+ 3)
% Row 14
\SetRowColor{white}
\mymulticolumn{4}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Defines physical specifications for network hardware and cabling.} \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{3.0366 cm} x{4.0488 cm} x{9.7846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{TCP/IP Model}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Layer}} & {\bf{Name}} & {\bf{Protocol Data Unit (PDU)}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
4 & \seqsplit{Application} & Data \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Provides network services to end-user applications, such as email, file transfer, and web browsing.} \tn 
% Row Count 7 (+ 3)
% Row 3
\SetRowColor{white}
3 & \seqsplit{Transport} & Segment \tn 
% Row Count 8 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Provides reliable, end-to-end data delivery and error recovery.} \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
2 & Internet & Packet \tn 
% Row Count 11 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Determines the best path for data transmission and performs logical addressing.} \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
1 & Network Link & Frame \tn 
% Row Count 15 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{17.67cm}}{\{\{rowspan=1\}\}\{\{bb\}\}Transfers data between network devices and manages physical addressing.} \tn 
% Row Count 17 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.6991 cm} x{11.5709 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Network Topologies}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Network Topology}} & {\bf{Description}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Bus Topology & A single cable connects all devices in a linear sequence. Each device communicates with the others through the cable. If the cable fails, the entire network goes down. \tn 
% Row Count 9 (+ 7)
% Row 2
\SetRowColor{LightBackground}
Star Topology & All devices are connected to a central hub or switch. If a cable fails, only the device connected to that cable is affected. \tn 
% Row Count 14 (+ 5)
% Row 3
\SetRowColor{white}
Ring Topology & Devices are connected in a circular loop. Each device communicates with the device next to it, and messages travel around the loop in one direction. If a cable fails, the entire network goes down. \tn 
% Row Count 22 (+ 8)
% Row 4
\SetRowColor{LightBackground}
Mesh Topology & Each device is connected to every other device in the network. This provides redundancy and fault tolerance, but requires more cabling than other topologies. \tn 
% Row Count 29 (+ 7)
% Row 5
\SetRowColor{white}
Tree Topology & Also known as a hierarchical topology, devices are organized in a hierarchical structure with multiple levels. This provides scalability and fault tolerance, but can be complex to manage. \tn 
% Row Count 37 (+ 8)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.6991 cm} x{11.5709 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Network Topologies (cont)}}  \tn
% Row 6
\SetRowColor{LightBackground}
Hybrid Topology & A combination of two or more different topologies. This provides the benefits of each topology, but can be more complex to manage. \tn 
% Row Count 5 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{2.5305 cm} x{7.9289 cm} x{6.4106 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Network Classes}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Class}} & {\bf{Range of IP Adresses}} & {\bf{Default Subnet Mask}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Class A & 1.0.0.0 to 126.255.255.255 & 255.0.0.0 \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Class B & 128.0.0.0 to 191.255.255.255 & 255.255.0.0 \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
Class C & 192.0.0.0 to 223.255.255.255 & 255.255.255.0 \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Class D & 224.0.0.0 to 239.255.255.255 & N/A \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
Class E & 240.0.0.0 to 255.255.255.255 & N/A \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{17.67cm}}{\bf\textcolor{white}{Subnetting}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{{\bf{Subnet Mask}}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{17.67cm}}{255.255.255.128} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{255.255.255.192} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{17.67cm}}{255.255.255.224} \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{255.255.255.240} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{17.67cm}}{255.255.255.248} \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{255.255.255.252} \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{3.5427 cm} x{6.9167 cm} x{6.4106 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Network Cables - Copper}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Cable Type}} & {\bf{Max Data Transfer Speed}} & {\bf{Max Operating Lenghts}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
CAT5 & 100 Mbps & 100 Meters \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
CAT5e & 1 Gbps & 100 Meters \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
CAT6 & 10 Gbps & 55 Meters \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
CAT6a & 10 Gbps & 100 Meters \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
CAT7 & 10 Gbps & 100 Meters \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
CAT8 & 40 Gbps & 30 Meters \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{2.7999 cm} x{3.9528 cm} x{3.7881 cm} x{5.9292 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{17.67cm}}{\bf\textcolor{white}{Network Cables - Fiber}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Cable Type}} & {\bf{Max Data Transfer Speed}} & {\bf{Max \seqsplit{Operating} Lenghts}} & {\bf{Typical Use}} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
OM1 - \seqsplit{Orange} \seqsplit{Jacket} & 10 Gbps & 33 Meters & 100 Mbps Ethernet \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
OM2 - \seqsplit{Orange} \seqsplit{Jacket} & 10 Gbps & 82 Meters & 1 Gbps Ethernet \tn 
% Row Count 11 (+ 4)
% Row 3
\SetRowColor{white}
OM3 - Aqua \seqsplit{Jacket} & 10 Gbps & 300 Meters & 10 Gbps Ethernet \tn 
% Row Count 14 (+ 3)
% Row 4
\SetRowColor{LightBackground}
OM4 - Aqua \seqsplit{Jacket} & 10 Gbps & 400 Meters & 100 Gbps at 150 Meters \tn 
% Row Count 17 (+ 3)
% Row 5
\SetRowColor{white}
OM5 - Green \seqsplit{Jacket} & 10 Gbps & 400 Meters & Improvements on OM4. \tn 
% Row Count 20 (+ 3)
% Row 6
\SetRowColor{LightBackground}
OS1 - \seqsplit{Yellow} \seqsplit{Jacket} & 100 Gbps & 10 \seqsplit{Kilometers} & Single mode fiber for connecting indoor nodes. \tn 
% Row Count 24 (+ 4)
% Row 7
\SetRowColor{white}
OS2 - \seqsplit{Yellow} \seqsplit{Jacket} & 100 Gbps & 200 \seqsplit{Kilometers} & Single mode fiber for connecting \seqsplit{infrastructure} outdoors. \tn 
% Row Count 29 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.8718 cm} x{11.3982 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{IEEE 802}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{IEEE 802 Standard}} & {\bf{Description}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
802.1Q & Virtual LAN (VLAN) tagging standard. \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
802.1X & Port-based network access control (PNAC) standard. \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
802.2 & Logical link control (LLC) layer protocol. \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
802.3 & Ethernet standard. \tn 
% Row Count 9 (+ 1)
% Row 5
\SetRowColor{white}
802.3ab & Gigabit Ethernet standard. \tn 
% Row Count 10 (+ 1)
% Row 6
\SetRowColor{LightBackground}
802.3ae & 10 Gigabit Ethernet standard. \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
802.3af & Power over Ethernet (PoE) standard. \tn 
% Row Count 14 (+ 2)
% Row 8
\SetRowColor{LightBackground}
802.3at & PoE+ standard. \tn 
% Row Count 15 (+ 1)
% Row 9
\SetRowColor{white}
802.3bt & 4-pair PoE standard. \tn 
% Row Count 16 (+ 1)
% Row 10
\SetRowColor{LightBackground}
802.11 & Wireless LAN (WLAN) standard. \tn 
% Row Count 18 (+ 2)
% Row 11
\SetRowColor{white}
802.11a & WLAN standard operating in the 5 GHz frequency band. \tn 
% Row Count 20 (+ 2)
% Row 12
\SetRowColor{LightBackground}
802.11b & WLAN standard operating in the 2.4 GHz frequency band. \tn 
% Row Count 23 (+ 3)
% Row 13
\SetRowColor{white}
802.11g & WLAN standard operating in the 2.4 GHz frequency band with higher data rates than 802.11b. \tn 
% Row Count 27 (+ 4)
% Row 14
\SetRowColor{LightBackground}
802.11n & WLAN standard with improved speed and range. \tn 
% Row Count 29 (+ 2)
% Row 15
\SetRowColor{white}
802.11ac & WLAN standard with even higher speed and range than 802.11n. \tn 
% Row Count 32 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.8718 cm} x{11.3982 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{IEEE 802 (cont)}}  \tn
% Row 16
\SetRowColor{LightBackground}
802.11ax & WLAN standard designed for high-density environments with many devices. \tn 
% Row Count 3 (+ 3)
% Row 17
\SetRowColor{white}
802.15 & Wireless personal area network (WPAN) standard. \tn 
% Row Count 5 (+ 2)
% Row 18
\SetRowColor{LightBackground}
802.15.4 & Low-rate WPAN standard used in Zigbee and other mesh networking protocols. \tn 
% Row Count 8 (+ 3)
% Row 19
\SetRowColor{white}
802.16 & Broadband Wireless Access (BWA) standard. \tn 
% Row Count 10 (+ 2)
% Row 20
\SetRowColor{LightBackground}
802.22 & Wireless regional area network (WRAN) standard for long-range, rural broadband. \tn 
% Row Count 14 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}



\end{document}