Chapter 25

Troubleshoot General Network Issues

This chapter covers the following topics related to Objective 5.5 (Given a scenario, troubleshoot general networking issues) of the CompTIA Network+ N10-008 certification exam:

  • Considerations

    • Device configuration review

    • Routing tables

    • Interface status

    • VLAN assignment

    • Network performance baselines

  • Common issues

    • Collisions

    • Broadcast storm

    • Duplicate MAC address

    • Duplicate IP address

    • Multicast flooding

    • Asymmetrical routing

    • Switching loops

    • Routing loops

    • Rogue DHCP server

    • DHCP scope exhaustion

  • IP setting issues

    • Incorrect gateway

    • Incorrect subnet mask

    • Incorrect IP address

    • Incorrect DNS

  • Missing route

  • Low optical link budget

  • Certificate issues

  • Hardware failure

  • Host-based/network-based firewall settings ...

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