CompTIA Network+: Troubleshooting Network Issues

CompTIA    |    Intermediate
  • 23 videos | 2h 44m 39s
  • Includes Assessment
  • Earns a Badge
Troubleshooting network connectivity is a complex responsibility that can require various approaches and techniques in order to resolve issues. In this course, you'll learn about using the appropriate network troubleshooting software tools and commands. You'll explore software tools such as Wi-Fi analyzers and port scanners and learn about traditional command line tools and network platform commands. You'll also examine how to troubleshoot common wireless connectivity issues including issues relating to specifications and limitations. Next, you'll learn about common considerations and issues pertaining to wireless connectivity. You'll explore general network troubleshooting best practices as they relate to wired networks. Finally, you'll examine considerations such as routing tables, VLAN assignment, and other common issues. This course is one of a collection of courses that prepares learners for the N10-008: CompTIA Network+ certification exam


  • Discover the key concepts covered in this course
    Recognize how to work with a packet sniffer to intercept and log network traffic
    Describe how to use a port scanner to identify which ports are open on a network
    Describe how to use a wi-fi analyzer to detect usage
    Recognize when and how to use a bandwidth speed tester
    Describe how to use other common software tools such as iperf, netflow analyzers, trivial file transfer protocol (tftp) server, terminal emulator, and ip scanner
    Describe how to use network troubleshooting command line tools, including ping, ipconfig, telnet, nmap, and netstat
    Outline the features and purpose of using linux command line tools
    Recognize how to troubleshoot wireless connectivity issues such as throughput, speed, distance, received signal strength indication (rssi) signal strength, effective isotropic radiated power (eirp), and power settings
    Describe wireless connectivity considerations such as antennas, channel utilization, site surveys, and ap association time
    Recognize common wireless connectivity issues including interference, channel overlap, antenna cable attenuation/signal loss, rf attenuation/signal loss, wrong ssid, incorrect passphrase, encryption protocol mismatch, insufficient wireless coverage, and captive portal issues
    Describe the key considerations when troubleshooting wired networking issues, including device configuration review, routing tables, interface status, vlan assignment, and network performance baselines
  • Describe how to troubleshoot issues relating to an incorrect or failed default gateway
    Describe how to troubleshoot issues relating to an incorrectly configured netmask
    Recognize how to troubleshoot issues caused by duplicate ip and mac addresses
    Recognize how to troubleshoot issues where names are not resolving
    Describe how to troubleshoot issues caused by expired dhcp scopes and rogue dhcp servers
    Recognize how to correct issues caused by expired ip addresses and incorrect system times
    Describe how to troubleshoot issues caused by untrusted ssl certificates and blocked tcp/udp ports
    Recognize how to troubleshoot issues caused by incorrect firewall and acl settings
    Describe how to correct issues caused by hardware failures and unresponsive services
    Outline the characteristics of and reason for common wired connectivity issues
    Summarize the key concepts covered in this course


  • 2m 1s
  • 5m 37s
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    3.  Network Port Scanning
    7m 15s
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    4.  Wi-Fi Analysis Tools and Techniques
    4m 22s
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    5.  Bandwidth Speed Testing
    6m 23s
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    6.  Common Network Software Tools
    6m 18s
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    7.  Common Command Line Tools
    12m 7s
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    8.  Common Linux Commands
    3m 49s
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    9.  Wireless Specifications and Limitations
    9m 27s
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    10.  Wireless Connectivity Considerations
    10m 2s
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    11.  Common Wireless Connectivity Issues
    10m 48s
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    12.  Wired Network Considerations
    9m 9s
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    13.  Default Gateway Issues
    4m 42s
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    14.  Incorrect Netmask Issues
    15m 13s
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    15.  Duplicate IP or MAC Addresses
    7m 12s
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    16.  Resolving Common DNS Issues
    6m 30s
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    17.  Expired DHCP Scopes and Rogue DHCP Servers
    7m 18s
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    18.  Expired IP Addresses and Incorrect System Times
    7m 41s
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    19.  SSL Certificates and Blocked Ports
    7m 6s
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    20.  Incorrect Firewall and ACL Settings
    3m 41s
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    21.  Hardware Failures and Unresponsive Services
    8m 14s
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    22.  Common Wired Connectivity Issues
    8m 31s
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    23.  Course Summary
    1m 12s


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