Signal-to-Noise Ratio in Networking

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Questions and Answers

What is the first step recommended in troubleshooting a network connectivity issue?

Troubleshoot the local network adapter

Check for any network connectivity at all (correct)

Inspect the physical components of the device

Ping the loopback IP address

What does a blinking link light on an ethernet interface indicate?

Incompatible device connected

Hardware failure

No network connectivity

Traffic being sent or received (correct)

What is the purpose of pinging the loopback IP address 127.0.0.1?

Checking external network connectivity

Testing network communication capabilities inside the device (correct)

Testing the switch connection

Verifying DNS settings

Why is it important to ping the IP address assigned to the local network adapter?

To ensure the local network adapter functions correctly Signup and view all the answers

What does it mean if the loopback address responds to a ping?

The device can communicate internally Signup and view all the answers

If there is no link light associated with an ethernet interface, what might be a likely issue?

Hardware failure in the switch Signup and view all the answers

What should you do after successfully pinging your local address?

Ping your default gateway Signup and view all the answers

What can cause intermittent connectivity on a wireless network?

Interference from devices on the same frequencies Signup and view all the answers

Why is it important to check the signal strength on your device?

To optimize communication path Signup and view all the answers

What could be a reason for interference on a wireless network?

Fluorescent lights or microwave ovens nearby Signup and view all the answers

What is a possible solution to intermittent connectivity issues on a wireless network?

Moving closer to the access point Signup and view all the answers

Why might it be beneficial to manually configure different channels in a wireless network?

To optimize performance Signup and view all the answers

What information can evaluating the signal-to-noise ratio (SNR) provide about a wireless network?

Interference level Signup and view all the answers

What should you do if you suspect interference from other tenants in a building on your wireless network?

Check your access point's configuration Signup and view all the answers

How does moving to a different location help optimize wireless communication?

By better optimizing the communications path Signup and view all the answers

What is the purpose of calculating SNR?

To measure signal quality compared to noise Signup and view all the answers

Why is noise represented in red in the utility diagram?

To distinguish it from the signal visually Signup and view all the answers

What is the significance of a wide ratio between signal and noise?

It suggests optimal network performance Signup and view all the answers

What does 'Limited or no connectivity' error message in Windows indicate?

Malfunctioning IP address configuration Signup and view all the answers

What do APIPA addresses allow communication with?

Local devices only Signup and view all the answers

How does network latency affect real-time communication like VoIP?

By causing choppy voice calls Signup and view all the answers

What issue might be present if there is a 1:1 ratio between signal and noise?

The wireless network may not operate properly Signup and view all the answers

Why is having a DHCP-assigned IP preferred over an automatic private IP?

'Limited or no connectivity' issues are avoided Signup and view all the answers

'Robotic noise' during a voice call can be caused by:

'Choppy' voice calls due to latency Signup and view all the answers

What does the jitter statistic measure in real-time communication?

The regularity of time intervals between frames Signup and view all the answers

What could cause large gaps between frames in a network?

Delay or latency Signup and view all the answers

Why is having a high-speed network and low latency important for quality phone calls?

To transfer more information quickly Signup and view all the answers

What might be the consequence of someone using all available bandwidth on a network?

Difficulty in making voice calls Signup and view all the answers

Why is it important to perform a packet capture on a network experiencing issues?

To identify where problems are occurring Signup and view all the answers

What does latency measure in a network?

Time between request and response Signup and view all the answers

How can one identify port flapping on a wired ethernet network?

Solid link light turning off and on Signup and view all the answers

What is the recommended action when experiencing port flapping issues?

Move to a different switch port Signup and view all the answers

Why should you check the physical media first when troubleshooting port flapping?

To ensure it supports required speeds and standards Signup and view all the answers

Study Notes

Troubleshooting a device that's unresponsive on a network begins with checking for network connectivity.
Check for a connection to the network by verifying a link light on the ethernet interface.
Once connected, test device's communication capabilities by pinging its loopback IP address (127.0.0.1).
Further testing involves pinging the local IP address assigned to the network adapter, checking for response from the default gateway, and attempting to ping external servers like Google's DNS servers.
Intermittent connectivity on wireless networks can be caused by interference or weak signal strength.
Interference can come from other devices using the same frequencies, fluorescent lights, microwave ovens, or other sources.
Check the signal strength, transmitting and receiving antennas, and frequencies used by the access point to optimize wireless network performance.
Use built-in utilities on operating systems or third-party tools to evaluate signal-to-noise ratio and identify interference sources.
Limited connectivity or no internet access issues may be caused by a private IP address assigned to the device instead of a DHCP server.
Old equipment or high bandwidth usage can lead to high latency and poor quality voice calls or media streaming.
Monitor jitter statistics to assess regularity of frames on the network and identify potential latency issues.
Requirements for real-time communication include high-speed networks and very low latency.

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Description

Learn about calculating Signal-to-Noise Ratio (SNR) and understanding the importance of signal and noise in networking. Explore how to visually represent signal as green and identify unwanted noise in network communications.