Troubleshooting the network Flashcards
what is the most common issue when it comes to network troubleshooting?
no connectivity
how should you start trouble shooting no connectivity?
start from the local device and work your way up through the network.
what is the first step for checking connectiviy?
is the link light on, is it plugged in?
what is step 2?
start with your own device and ping a loopback IP address
what is step 3?
ping the local IP address to check the configuration of the local system, adapter, and link signal
what is step 4?
try pinging the default gateway
what is step 5?
ping a device on the internet, a common choice is google at 8.8.8.8
what can cause an issue with intermittant connectivity on wifi?
interferance, or a location issue or signal strength issue.
what are some ways you can improve overall wifi performance?
optimize router placement, update firmware, limit connected devices, configure channel optimization
what are some predictable areas of interference?
flourescent lights, microwave ovens, cordless telephones, high power sources
what is an unpredictable
in places such as a multi tenant building.
what is signal to noise ratio?
it quantifies the ratio of the desired signal strength to the level of background noise or interference present in a signal
where can you check more info about signal to noise?
in the performance monitor in windows.
why is it common to experience lag or delay in voice and video calls?
because its real time so dropped packets cannot be retransmitted.
what is a jitter statistic?
a way to describe the variation in the arrival times of data packets over a network.
what is latency?
the amount of time between a request and a response.
what is one of the best ways to measure latency?
with packet captures.
what are packet captures?
the process of intercepting and recording data packets that are transmitted over a computer network.
what kind of info do packet captures contain?
network traffic, application data and protocol specific information.
what is port flapping?
a network phenomenon where a network switch or router interface (port) rapidly and repeatedly transitions between the up (active) and down (inactive) states. The rapid switching on and off of a network port can disrupt network connectivty and cause various network related problems.
