First check how much you know on WLAN?

Before writing the different topics for different WLAN concepts. I am starting with questions on WLAN. So that you know where you stand. Below are some of the frequently asking WLAN interview questions. See how much you know.



1. what are main diff between 11n and 802.11a/b/g feaures ?
2. what is A-MPDU and A-MSDU . Diffrence between them ?
3. what is lenghts supported on A-MSDU and A-MPDU ?
4. what are diffrences between a,b and g in range ,speed and all other aspects ?
5. How DFS will work ?
6. What are diff frames that will be exchanged at the time of channel switch announcement ?
7. what is dis-assosiation and de-authentication when they will happen ?
8. What is  diffrence between wpa1 and wpa2 auth key managemnet and how we can diffrentiate whther its psk or 802.1x ?
9. what are diffrenrent fileds in the  beaccon frames ?
10.what are three diffrent regulatory domains? what are the channels supported ?
11.what are rdaios suppotred in J domain?
12 what are diff auth methods supported in 802.1x ?
13. How client know open+none and open+wep ?
14. How legacy power save and u-apsd will work ?
15  How many AID's will support ?
16. How TXOP,ESOP will work ? when they will be negotiated ?
17. How fragmentation will affect with rts thresold it is configured on the AP.
18. What are address will update when frame sent from wired client to wireless client adress1 ,address2 and address3.
19. What is EIFS and what is the interval used ?
20. How RTS and CTS frame wil be sent how frgamentation thresold will impact ?
21. what are wps methods and how iot will work ?
22. what are values of throughput thresold getting with b/g network ?
23. How cckm will work ? what is wds ?
24. How leap will work ?
25. 802.1x process for leap ?
26. Four way hand shake process in 802.1x?
27. How PTK and GTK derived and what are the speps ?
28. what are different types of inter frame spacing ? which will be used and when ?
29. when will be used SIFS and DIFS ,EIFS ?
30. Why we need Qos and what are advantages of QOs ?
31. What are diffrent parameters involved in qos ?
32. How TXOP will work for sending the data ?
33. When we use wpa2 psk with wrong pass phrase which level it will fail ?
34. How A-nounce and S-nounce will be derived ?
35. What is MIMO ? how 2*3 antenna will work ? how 3 recievers will work ?
36. what is antennas diversity ?
37. With 2*3 what is maximum bandwidth we will get ?
38. For MCS what are the parameters will involved /
39. How b/g protection will work ?
40. What are diffrent types of power saves ? tell about legacy and u-apsd ?
41. How we can know wheter it is MSDU or A-msdu data ?
42. What will be fields of qos control data ?
43. What is guard interval ? how its implemented ?
44. what is need of preambles ? IFS ? guard intervals ?
45. What is hidden ap ?
46. What is hidden ssid how it will work ?
47. How erp protection will work ?
48. What is for ground scanning and what is back ground scanning ?
49. How 11n WPA TKIP will work ?
50. How DTIM will work ?
51. What is number of handshakes will happen in wpa1 and wpa2 ?
52. What are data rates used for ACK ? multicast ?
53. Diffrent type of data rates like basic ,supported ?
54. When open authentication it self will fail ?
55. When assosiation will fail ?
56. What is diff between ap reboot and radio reset actions ?
57. How 40/20 and 20 mhz co-location will work ?
58. What are diffrent types of ack mechanism used with A-msdu and A- mpdu ?
59. What is ATIM and how it will work ?
60. What are mandatory rates for a,b,g?
61. Diff between wep and TKIP ?

62. Will the force Change in centre frequency of channel effect the throughput?

63. what is the difference between pep0 and peap 1?
64. 1In WPA2 mixed what is the Group Wise Cipher and pairwise cipher used
65. What is the difference between AES and TKIP encryption in EAPOL handshake?
66. What replay protection mechanism?
67. In DFS is there is radar  signal  on 48 and client moved to next DFS 58.If radar seen in 58 will the client move to different DFS channel or move back to 48?
68. What is the Broadcast address for 192.168.1.10 with mask 255.255.255.0?
69.  What are the messages seen on wireshark when EAPOL 802.1x authentication is happening?
70. Which all the authentication does IAS server support?
71. What are software used in WMM-PS?
72. If the IP addrees class is changed from Class C to Class B in WMM-PS will there be any setup issues?
73  With 1x1,20Mhz,Long GI what is the Data Rate the client supports?
74  Which MCS index /Long GI 65Mbps is achievable?By configuring it to shortGI what is the difference in throughtput?
75. What are Different 11n Modes?



I will keep on adding what ever possible.