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\ihead{CCNA v7.02: ITN (Introduction to Networks)}
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\ohead{kohnlehome.de/cisco/CCNA-1-17.pdf}
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\ifoot{Franz Kohnle}
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\begin{document}

% Überschrift 
\begin{center}
    \LARGE % Schriftgröße
    \bfseries % Fettdruck
    \sffamily % Serifenlose Schrift
    17 Build a Small Network
\end{center}

\section*{17.1 Devices in a Small Network}
\begin{itemize}
    \item Small Network Topologies
    \item Device Selection for a Small Network
    \begin{itemize}
        \item Cost
        \item Speed and Types of Ports/Interfaces
        \item Expandability
        \item Operating System Features and Services (Layer 3 switching, NAT, DHCP, Security, QoS, VoIP)
    \end{itemize}
    \item IP Addressing for a Small Network (End user devices, Servers and peripherals devices, Intermediary devices (Switches, Access Points))
    \item 17.1.3 Etwas seltsames IP addressing scheme
    \item Redundancy in a Small Network: Servers, Links, Switches, Router
    \item Traffic Management: QoS
\end{itemize}


\section*{17.2 Small Network Applications and Protocols}
\begin{itemize}
    \item Windows Taskmanager: applications, processes, and services
    \item Server: Web, Email, FTP, DHCP, DNS
    \item Voice and Video Applications: Infrastructure, VoIP, IP Telephony, Real-Time Applications (RTP, RTCP)
\end{itemize}


\section*{17.3 Scale to Larger Networks}
\begin{itemize}
    \item Small Network Growth
    \begin{itemize}
        \item Network documentation: Physical and logical topology
        \item Device inventory: List of devices
        \item Budget: Itemized IT budget
        \item Traffic analysis: Protocols, applications, and services
    \end{itemize}
    \item Protocol Analysis: Wireshark statistics
    \item Employee Network Utilization
    \begin{itemize}
        \item OS and OS Version
        \item CPU utilization
        \item RAM utilization
        \item Drive utilization
        \item Non-Network applications
        \item Network applications
        \item Windows 10: Settings $\rightarrow$ Network + Internet $\rightarrow$ Data usage $\rightarrow$ network interface
    \end{itemize}
\end{itemize}


\section*{17.4 Verify Connectivity}
\begin{itemize}
    \item ping
    \item Cisco IOS extended ping: paramter, z.B. Quell-IP, ping ipv6
    \item Windows tracert (ICMP Echo Request)
    \item IOS traceroute (UDP mit ungültigem Zielport, Abbruch mit Ctrl-Shift-6)
    \item Network Baseline: Round trip time mit ping
\end{itemize}


\section*{17.5 Host and IOS Commands}
\begin{itemize}
    \item IP Configuration
    \begin{itemize}
        \item Windows: Network and Sharing Center, ipconfig /all /release /renew /displaydns
        \item Linux: Connection Information, ifconfig, ip add
        \item macOS: Network Preferences > Advanced, ifconfig en0, networksetup -listallnetworkservices, networksetup -getinfo
    \end{itemize}
    
    \item arp -a, netsh interface ip delete arpcache 
    \item IOS
    \begin{itemize}
        \item show running-config 
        \item show interfaces
        \item show ip interface
        \item show arp
        \item show ip route 
        \item show protocols 
        \item show version
        \item show cdp neighbors
        \item show ip interface brief
    \end{itemize}
\end{itemize}


\section*{17.6 Troubleshooting Methodologies}
\begin{itemize}
    \item Basic Troubleshooting Approaches
    \begin{enumerate}
        \item Identify the Problem
        \item Establish a Theory of Probable Causes
        \item Test the Theory to Determine Cause
        \item Establish a Plan of Action and Implement the Solution
        \item Verify Solution and Implement Preventive Measures
        \item Document Findings, Actions, and Outcomes
    \end{enumerate}
    \item Resolve or Escalate?
    \item debug
    \begin{itemize}
        \item debug ip icmp
        \item no debug ip icmp, undebug ip icmp, undebug all
        \item terminal monitor (debug messages an vty weiterleiten)
    \end{itemize}
\end{itemize}


\section*{17.7 Troubleshooting Scenarios}
\begin{itemize}
    \item Half-duplex vs. Full-duplex
    \item IP Addressing Issues (IOS Devices, End Devices)
    \item Default Gateway Issues
    \item Troubleshooting DNS Issues (nslookup)
\end{itemize}


\section*{17.8 Module Practice}
\begin{itemize}
    \item 17.8.1 Lab/PT - Design and Build a Small Business Network
    \item 17.8.2 Packet Tracer - Skills Integration Challenge
    \begin{itemize}
        \item Subnetting
        \item PC: IPv4, SM, GW, IPv6 Unicast, Link logical
        \item Router: hostname, disable DNS lookup, enable secret, console password, minimale Passwortlänge, service password encrytion, banner motd, IPv4, IPv6
        \item Switches: hostname, SVI, GW, disable DNS lookup, enable secret, console password, service passsword encryption
    \end{itemize}
    \item 17.8.3 Packet Tracer - Troubleshooting Challenge
\end{itemize}


\end{document}
