Podcast
Questions and Answers
What does establishing a network baseline help determine?
What does establishing a network baseline help determine?
- The normal performance metrics of the network (correct)
- The types of devices that can be connected
- The best practices for troubleshooting
- The specific type of network equipment used
What can high latency indicate in a network environment?
What can high latency indicate in a network environment?
- The network is overloaded (correct)
- A problem with network cable connections
- The network speed is functioning properly
- There are hardware failures
Which situation might prompt a technician to escalate an issue to a network engineer?
Which situation might prompt a technician to escalate an issue to a network engineer?
- If all devices seem to be connected but aren't functioning
- If the network equipment is outdated
- If the user complains about network speed
- If port flapping persists after reseating the cable (correct)
When troubleshooting slow network speeds, what is an important initial question to ask?
When troubleshooting slow network speeds, what is an important initial question to ask?
What role does checking link activity lights play during troubleshooting?
What role does checking link activity lights play during troubleshooting?
What does an IP address starting with 169.254 indicate?
What does an IP address starting with 169.254 indicate?
What is the primary source of interference in wireless networks?
What is the primary source of interference in wireless networks?
What step should be taken first when troubleshooting limited connectivity?
What step should be taken first when troubleshooting limited connectivity?
How can one improve signal strength in weak areas of a wireless network?
How can one improve signal strength in weak areas of a wireless network?
What is the main purpose of configuring Quality of Service (QoS) in a network?
What is the main purpose of configuring Quality of Service (QoS) in a network?
What does latency refer to in a VoIP context?
What does latency refer to in a VoIP context?
Which command shows the current IP configuration of a device?
Which command shows the current IP configuration of a device?
What issue arises when different devices are competing for the same frequency range in a wireless network?
What issue arises when different devices are competing for the same frequency range in a wireless network?
What is jitter in networking?
What is jitter in networking?
What should be verified when a device can ping a remote device by its IP address but not by its hostname?
What should be verified when a device can ping a remote device by its IP address but not by its hostname?
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Study Notes
Network Troubleshooting
- Network connectivity is a common issue.
- Establishing a network baseline is important for troubleshooting.
- Basic steps for troubleshooting networks:
- Verify physical connections are intact, using a cable tester and checking link activity lights.
- Ensure all network equipment is powered on and functioning properly.
- Troubleshooting slow network speeds:
- Identify if slowness affects all devices or specific resources.
- High Latency: Check for port flapping, reseating the network cable, or replacing the cable.
- Network Infrastructure: Use appropriate cables for appropriate speeds, such as CAT 6, and ensure switch compatibility.
- Software: Check for malware, background processes, and outdated drivers.
- Troubleshooting Limited Connectivity:
- Start at the local device and work your way up the network.
- Ping the localhost address (127.0.0.1) to check TCP/IP protocol installation.
- Ping the device's IP address to confirm network configuration.
- Ping the default gateway to check communication across the network.
- Ping an external device to pinpoint the source of the issue.
- IP Configuration: Check for valid IP address, subnet mask, and other IP information.
- APIPA addresses (169.254.x.x) indicate a DHCP server issue.
- DNS Configuration: Verify DNS configuration; if correct, escalate to network engineers for DNS server troubleshooting.
- Wireless Networking Troubleshooting:
- Slow speeds and high latency: Check infrastructure hardware and external interference.
- External interference: Change wireless network's operating channel to mitigate interference from devices like microwaves operating at 2.45 GHz.
- Signal Strength: Perform site surveys to determine signal strength and consider moving access points or adding wireless extenders.
- Voice over IP (VoIP) Troubleshooting:
- Quality of Service (QoS): Prioritize VoIP traffic to ensure consistent bandwidth and service.
- Latency: Check for port flapping, bad cables, or external interference.
- Jitter: Check QoS settings; consider jitter buffers as a last resort.
Summary
- The video outlines common network troubleshooting steps, including basic checks, addressing slow speeds and limited connectivity, and resolving issues with wireless and VoIP networks.
- Key concepts include establishing a network baseline, working your way up from the client device, checking the infrastructure, and troubleshooting interference and QoS.
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