Title: Troubleshoot common network issues.
Course: Cybersecurity Systems Technology, Advanced (10109-IV) > Section: Troubleshooting Networks

Troubleshooting should include an explanation of how to resolve the issue, and the following:

- Incorrect IP configuration/default gateway
- Broadcast storms/switching loop
- Duplicate IP
- Speed and duplex mismatch
- End-to-end connectivity
- Incorrect VLAN assignment
- Hardware failure
- Misconfigured DHCP
- Misconfigured DNS
- Incorrect interface/interface misconfiguration
- Cable placement
- Interface errors
- Simultaneous wired/wireless connections
- Discovering neighboring devices/nodes
- Power failure/power anomalies
- Maximum Transmission Unit (MTU)/MTU black hole
- Missing IP routes
- NIC teaming misconfiguration
  - Active-active vs. active-passive
  - Multicast vs. broadcast

Process/Skill Questions:

- How is an incorrect IP configuration/default gateway determine, and what are the steps to correct the issue?
- How is an incorrect VLAN assignment resolved?
- What does it mean if a computer has been assigned a 169.254.x.x IP address?