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\ihead{CCNA v7.0 Enterprise Networking, Security, and Automation}
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\ohead{kohnlehome.de/netz/CCNA-3-11.pdf}
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\ifoot{Franz Kohnle}
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\begin{document}

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    11 Network Design
\end{center}

\section*{11.1 Hierarchical Networks}
\subsection*{Borderless Switched Networks}
\begin{itemize}
    \item connect anyone, anywhere, anytime, any device
    \item connect securely, reliably, seamlessly
    \item hierarchical, modular, resilient, flexible
\end{itemize}

\subsection*{Hierarchy}

\begin{tabular}{l | l | l | l}
Two-Tier  & Three-Tier & Funktion & Devices\\ \hline\hline
\multirow{2}{*}{Collapsed Core} & Core Layer & high-speed backbone connectivity & Router \\ \cline{2-4} 
 & Distribution Layer & routing, QoS, security & L3-Switch\\ \hline
Access Layer & Access Layer & network access to the user & L2-Switch, AP, End devices\\ \hline
\end{tabular}


\section*{11.2 Scalable Networks}
\begin{itemize}
    \item Redundancy
    \begin{itemize}
        \item Redundant switches and router
    \end{itemize}
    \item Multiple Links
    \begin{itemize}
        \item Redundant paths: STP (Spanning Tree Protocol)
        \item Link Aggregation: Etherchannel        
    \end{itemize}
    \item Scalable Routing protocol
    \begin{itemize}
        \item OSPF: Mulitarea
    \end{itemize}
    \item Wireless Connectivity
    \begin{itemize}
        \item WLAN
    \end{itemize}
    \item Reduce Failure Domain Size: Switch Block (Paare von Distribution-L.-Switches)
\end{itemize}
\section*{11.3 Switch Hardware}
\begin{itemize}
    \item Switch Platform
    \begin{itemize}
        \item Campus LAN Switches: 2960, 3560, 3650, 3850, 4500, 6500, 6800   
        \item Cloud-Managed Switches: Cisco Meraki
        \item Data Center Switches: Cisco Nexus: scalability
        \item Service Provider Switches: aggregation switches / Ethernet access switches 
        \item Virtual Networking: Cisco Nexus virtual networking switch
    \end{itemize}
    \item Switch Form Factors
    \begin{itemize}
        \item fixed configuration / modular configuration
        \item stackable / non-stackable
        \item thickness: rack units (1U = 1,75 inch = 44,45 mm)
        \item port density (Catalyst 3850: 12, 24, 48 Ports, Catalyst 9400: 384 Ports)
        \item forwarding rates (100 Mbps, 1 Gbps, 10 Gbps 100 Gbps)
        \item PoE (Power over Ethernet), PoE pass-through (Switch wird selbst mit PoE versorgt , 2960-C)
        \item Multilayer Switch (ASIC: application-specific integrated circuits)
    \end{itemize}
\end{itemize}

\section*{11.4 Router Hardware}
\begin{itemize}
    \item Cisco Routers
    \begin{itemize}
        \item Branch (simple configuration and management): Cisco ISR 4000
        \item Network Edge (fast performance, high security): Cisco ASR 9000
        \item Service Provider (end-to-end delivery of subscriber services): Cisco NCS 6000
        \item Industrial (harsh environments): Cisco 1100
        \item Cisco Nexus virtual networking
    \end{itemize}
    \item Router Form Factors
    \begin{itemize}
        \item Cisco 900: small branch office router
        \item Cisco ASR 9000 and 1000: network edge
        \item Cisco Network Convergence System 5500: large data centers
        \item Cisco 800 Industrial Integrated Services Router: harsh environments
    \end{itemize}
\end{itemize}


\end{document}
