Thanx for the source of deep understanding. I m bit confused on direct prob request, As you said it will be unicast. will it be unicast ? or broadcast and only AP whose ssid matched will response ? As per the captures it shows destination address is broadcast address.
Dear Saiprasad, following are my explanations for your query: AP (Access Point) Side: - Beacon Transmission - Probe Response STA Side: - Passive Scanning: The STA listens to the beacon frames transmitted by APs in the vicinity. This process is called passive scanning because the STA is not actively transmitting any frames. - Probe Request: If the STA finds an AP with a matching SSID, it sends a probe request frame to the AP to gather more information about the AP's capabilities. - Authentication and Association: After receiving the probe response from the AP, the STA can initiate the authentication and association process to connect to the AP. So in Passive Scanning, the STA does not transmit any frames until it finds a suitable AP and sends a probe request. This approach helps conserve power and reduces interference. Hope I addressed your query. Thanks & Regards Hari
If two or more devices send probe request at the same time will there be collision? Also what will happen to a probe request if an ongoing data transmission in going on? Waiting eagerly for your reply.
As per my experience I never faced a situation like this, where two or more devices send probe request at the same time and there will be a collision. If at all this kind of situation arises, there will be no collision for sure. It will be taken care internally. Also during data transmission, if a probe request comes, probe response will be sent accordingly. Hope this will help you. Thank you so much.
Its very simple and same I have explained in the video itself. First of Active scanning is fast in comparison to the Passive scanning. Also passive scanning always takes place after a specific time interval. Thanks for connecting with me.
One more confusion is that as part of Active scanning how the different timings are going to use like probe delay, min channel time max channel time. Could you please help on this ?
Sir it's a well explained video. If I want to test a device is scanning properly or not, do I need to analyse the probe req/res frames? If yes what are the information elements which can confirm that scanning module is working fine.
Thank you so much Soumya. Yes, to test a device is scanning properly or not, you need to analyse the probe req/res frames. You can look in to "802.11 MAC Header" IE to confirm the same. You have to look Type and Subtype fields. Also to differentiate within a broadcast probe request and dedicated probe request , please see the Destination in "802.11 MAC Header". If you like my channel and need to get update please do Subscribe. Thanks.
Thanx for the source of deep understanding.
I m bit confused on direct prob request, As you said it will be unicast. will it be unicast ? or broadcast and only AP whose ssid matched will response ?
As per the captures it shows destination address is broadcast address.
Hey Prabhat, sorry for late reply. You are absolutely correct. Thanks for your understanding.
@@HariKrishnaSahu So, it seems like Directed Probe Request also looks llke Broadcast packet with SSID name field.
Super explanation
Thank you so much for your appreciation. Please click on LIKE, SUBSCRIBE and the BELL button. Thanks.
Can you please explain the AP and STA connection process in Passive Scanning ?
Dear Saiprasad, following are my explanations for your query:
AP (Access Point) Side:
- Beacon Transmission
- Probe Response
STA Side:
- Passive Scanning: The STA listens to the beacon frames transmitted by APs in the vicinity. This process is called passive scanning because the STA is not actively transmitting any frames.
- Probe Request: If the STA finds an AP with a matching SSID, it sends a probe request frame to the AP to gather more information about the AP's capabilities.
- Authentication and Association: After receiving the probe response from the AP, the STA can initiate the authentication and association process to connect to the AP.
So in Passive Scanning, the STA does not transmit any frames until it finds a suitable AP and sends a probe request. This approach helps conserve power and reduces interference.
Hope I addressed your query.
Thanks & Regards
Hari
@@HariKrishnaSahu Thank you
If two or more devices send probe request at the same time will there be collision?
Also what will happen to a probe request if an ongoing data transmission in going on?
Waiting eagerly for your reply.
I will get back to you on this. Thanks.
@@HariKrishnaSahu Sir I also have another question that is during passive scanning say the AP sends out a beacon. What is the length of that beacon?
As per my experience I never faced a situation like this, where two or more devices send probe request at the same time and there will be a collision. If at all this kind of situation arises, there will be no collision for sure. It will be taken care internally. Also during data transmission, if a probe request comes, probe response will be sent accordingly. Hope this will help you. Thank you so much.
Hey Sagnik. Thanks for asking this question to me. At present I don't have any particular answer for this. I will let you know on this.
@@HariKrishnaSahu Sir Thank you!!
Nice explanation Sir. Can you please tell why active scanning is preferred over passive scanning.. Hoping to get reply very soon.
Its very simple and same I have explained in the video itself. First of Active scanning is fast in comparison to the Passive scanning. Also passive scanning always takes place after a specific time interval. Thanks for connecting with me.
One more confusion is that as part of Active scanning how the different timings are going to use like probe delay, min channel time max channel time. Could you please help on this ?
awesome explanation sir:)
Thank you so much mam.
Sir it's a well explained video. If I want to test a device is scanning properly or not, do I need to analyse the probe req/res frames? If yes what are the information elements which can confirm that scanning module is working fine.
Thank you so much Soumya. Yes, to test a device is scanning properly or not, you need to analyse the probe req/res frames. You can look in to "802.11 MAC Header" IE to confirm the same. You have to look Type and Subtype fields. Also to differentiate within a broadcast probe request and dedicated probe request , please see the Destination in "802.11 MAC Header". If you like my channel and need to get update please do Subscribe. Thanks.
Can you please make videos on MIMO, MU-MIMO & Beamforming as well. Would be very helpful.
Sure I am willing to do. But due lake of time, I am not able to do. Will let you know on this. Thanks a lot.
audio clarity is not good. lot of noise signals are added.
I am so sorry for that. Will try to improve. Thanks for connecting.
Please make video on Authentication process, wifi security, EAPOL
Will do it soon. You will be notified. Thanks for your feedback.
Dear Pavan, At present on WEP security one video is there from my side. If you wish you can have a look into it. Thanks.
Dear Pavan, Thanks for your feedback. Today I uploaded a video as per your request for wifi security. You can watch and write your comments. Thanks.
@@HariKrishnaSahu thank you very much
Audio not good, please resend new video
Sure I will try.