Troubleshooting the network

Question 1

what is the most common issue when it comes to network troubleshooting?

Answer 1

no connectivity

Question 2

how should you start trouble shooting no connectivity?

Answer 2

start from the local device and work your way up through the network.

Question 3

what is the first step for checking connectiviy?

Answer 3

is the link light on, is it plugged in?

Question 4

what is step 2?

Answer 4

start with your own device and ping a loopback IP address

Question 5

what is step 3?

Answer 5

ping the local IP address to check the configuration of the local system, adapter, and link signal

Question 6

what is step 4?

Answer 6

try pinging the default gateway

Question 7

what is step 5?

Answer 7

ping a device on the internet, a common choice is google at 8.8.8.8

Question 8

what can cause an issue with intermittant connectivity on wifi?

Answer 8

interferance, or a location issue or signal strength issue.

Question 9

what are some ways you can improve overall wifi performance?

Answer 9

optimize router placement, update firmware, limit connected devices, configure channel optimization

Question 10

what are some predictable areas of interference?

Answer 10

flourescent lights, microwave ovens, cordless telephones, high power sources

Question 11

what is an unpredictable

Answer 11

in places such as a multi tenant building.

Question 12

what is signal to noise ratio?

Answer 12

it quantifies the ratio of the desired signal strength to the level of background noise or interference present in a signal

Question 13

where can you check more info about signal to noise?

Answer 13

in the performance monitor in windows.

Question 14

why is it common to experience lag or delay in voice and video calls?

Answer 14

because its real time so dropped packets cannot be retransmitted.

Question 15

what is a jitter statistic?

Answer 15

a way to describe the variation in the arrival times of data packets over a network.

Question 16

what is latency?

Answer 16

the amount of time between a request and a response.

Question 17

what is one of the best ways to measure latency?

Answer 17

with packet captures.

Question 18

what are packet captures?

Answer 18

the process of intercepting and recording data packets that are transmitted over a computer network.

Question 19

what kind of info do packet captures contain?

Answer 19

network traffic, application data and protocol specific information.

Question 20

what is port flapping?

Answer 20

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.