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In this section of the course,

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we're going to discuss troubleshooting tools.

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Now, troubleshooting tools for networks are the

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essential instruments used by network administrators

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to diagnose and resolve their network problems.

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These tools range from simple diagnostic commands,

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like the ping and traceroute commands

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that can be used to isolate connectivity issues,

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to more advanced software that actually monitors

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your network traffic patterns

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and logs it to be able to identify bottlenecks

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or malicious activities that may be occurring.

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So in this section, we're once again going to be focused

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solely on Domain Five, Network Troubleshooting,

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but this time we'll be looking at Objective 5.5.

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Objective 5.5 states that given a scenario,

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you must be able to use the appropriate tool

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or protocol to solve networking issues.

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First, we're going to look at hardware tools like crimpers,

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cable strippers, toner probes, punch down tools,

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and many others.

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Then we'll discuss software tools,

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like packet capture tools, speed test tools,

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and packet analyzers.

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Next, you're going to learn about ipconfig, ifconfig,

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and ip, which are all command line tools.

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These command line tools are used

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for displaying current network configuration information,

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managing your network interfaces,

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and troubleshooting basic connectivity issues on Windows,

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Mac, and Unix systems.

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After that, we're going to be exploring the ping, traceroute,

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and tracert command line tools.

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These diagnostic utilities can help

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in determining the connectivity and latency

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between your source and destination nodes,

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and it can help map the path between those two areas

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that your data packets are going to take

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when it crosses the network.

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Then we're going to be covering the nslookup

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and dig command line tools.

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These domain name system or DNS lookup tools will provide

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us with details on domain name mappings,

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and they can also be used to troubleshoot DNS-related issues

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and query your DNS records.

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Next we're going to look at the arp command line tool.

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The arp, or address resolution protocol command,

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is going to be used to view and modify the ip

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to mac address mappings inside of your local arp cache,

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and it's used to be able to resolve network layer issues

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that deal with ip to mac address layers,

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which goes from layer three to layer two of the OSI model.

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After that, we're going to explore the

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netstat command line tool.

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Netstat is a versatile command line utility

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that's used to be able to get statistics on your

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TCP/IP and network interface details

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that allows you to moderate incoming and outgoing

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network connections as well.

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Then we'll discuss the tcpdump command line tool.

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The tcpdump is going to be a powerful packet analyzer

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that captures and displays the contents of network packets

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for in-depth traffic analysis and network troubleshooting.

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Next, we're going to explore the nmap command line tool.

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Now, nmap is a robust network scanning tool

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that's used to discover devices and services on a network,

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and provides us with comprehensive security auditing

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and network inventory capabilities too.

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After that, we're going to look at some

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basic network device commands, like show config,

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show interface, and show route,

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and then we'll be exploring some more

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network device commands, including show mac address table,

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show arp, show vlan, and show power.

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Next, we'll discuss the different discovery protocol tools,

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including the link layer discovery protocol or LLDP,

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and the Cisco Discovery Protocol or CDP.

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Finally, we'll take a short quiz to see what you learned

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during this section of the course and review your answers

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to ensure you know why the right answers are right,

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and the wrong answers are wrong.

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So if you're ready, let's get started learning

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all about troubleshooting tools

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in this section of the course.