5.7 - Troubleshooting Networks Flashcards
What is the first step in troubleshooting a network connectivity issue where there is no response from the device?
The first step is to check if there is any network connectivity at all. Check for a link light on the ethernet interface and observe if there is any traffic indication.
How do you test if your local device is connected to the network?
Ping the loopback IP address 127.0.0.1 to ensure your device’s network capabilities are functioning.
After confirming local connectivity, what is the next step to troubleshoot network issues?
Ping the IP address assigned to your local network adapter to verify that the physical network adapter is working properly.
What should you do if you get a response from your local IP address?
Ping the default gateway to check if it can respond and confirm that packets are being sent and received on the local network.
If the default gateway responds, what is the next step in the troubleshooting process?
Ping an external IP address, such as Google’s DNS server at 8.8.8.8, to verify connectivity to the internet.
What could intermittent connectivity on a wireless network indicate?
It may indicate interference on the wireless network, potentially caused by other devices or access points using the same frequencies.
What factors should you consider if you’re experiencing poor wireless signal strength?
Check the signal strength, the positioning of the access point, and whether the frequencies are set to automatic or manual configuration.
How can physical location affect wireless network performance?
Being closer to the access point generally improves performance. If the area is large, consider moving closer to the access point or relocating it.
What is the role of the signal-to-noise ratio (SNR) in wireless networks?
The SNR measures the ratio of good signal to noise. A higher ratio indicates better network performance and less interference.
How can you visually check for interference on a wireless network?
Use utilities that calculate SNR or check Performance Monitor in Windows to visualize the signal-to-noise ratio.
What should you do if Windows indicates ‘limited or no connectivity’?
Check the IP address assigned to your device. If it’s an automatic private IP address (APIPA), the DHCP server may not be available, and your system has created its own IP address.
How does jitter affect real-time communications like VoIP or media streaming?
Jitter affects the consistency of frame intervals. Large gaps between frames can cause choppy or difficult-to-understand voice calls.
What is the definition of latency in networking?
Latency is the time it takes between a request and a response, which impacts how much information can be transferred between devices.
What tool can help measure network latency accurately?
Packet captures can provide detailed information about latency, down to microseconds, by analyzing each packet sent between devices.
What is port flapping and how might you troubleshoot it?
Port flapping is when the link light on an ethernet port turns on and off intermittently. Troubleshoot by checking the physical media, using a cable tester, or trying different hardware or ports.
