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wifi-driver interview questions

Top wifi-driver frequently asked interview questions

Can I change the Wi-Fi adapter on my Dell Inspiron 15 3542 to get a 5GHz Wi-Fi connection?

I own an Dell Inspiron 15 3542 laptop, which does not support the 5GHz Wi-Fi bandwidth.

I want to know if I can change the wireless adapter to a WLAN 802.11AC so that my laptop can connect to a 5GHz Wi-Fi connection. Would my laptop be compatible with it (because my laptop originally had a 802.11 b/n/g product)?

Also, how do I check if a particular adapter is compatible with my laptop?


Source: (StackOverflow)

How to make my Dell Windows 7 Laptop as a Wi-Fi Hotspot to use internet in my iPad?

How do I make my Dell Windows 7 Laptop a Wi-Fi Hotspot to use the internet on my iPad?

My modem is not Wi-Fi enabled and I don't have a hardware wireless router.


Source: (StackOverflow)

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Why WiFi drivers carry firmware with them?

Why do linux kernel modules for wireless LANs have 'device firmware'accompanying them while other driver modules don't seem to carry a copy of the firmware with them?

Edit: I've been informed that the same is the case with graphics card driver modules too.


Source: (StackOverflow)

Wifi Adapter not working in windows 8

I have Dell Inspiron 15R N5010 with the Network Adaptor card as

Broadcom 802.11n Network Adapter

Provider : Broadcom

File version : 5.100.245.20

Driver Provider : Microsoft

Digital Signer : Microsoft Windows

It always fails to connect to the wifi network provided in our campus.Even if it connects their is no internet connection . I have to "Diagnose" the adapter always and it will connect to it.

How do I make it work again as it was working in Windows 7? Any problem in settings or I should change the driver ?Update ?

MY DEVICE MANAGER . IF IT HELPS.

enter image description here


Source: (StackOverflow)

How to fight network latency and jitter issues on Wifi?

I'm having problems with my Wifi connection.

I did a test on PingTest.net with the following results:

Packet Loss: 0%
Ping: 103ms
Jitter: 29ms

Same test but from another machine on the network resulted in much less numbers for Ping (17ms) and Jitter (1ms). I updated my driver for the wireless card with the latest available.

I'm using Intel Ultimate-N 6300 AGN adapter (Win7/64bit) and D-Link 855L wireless router. WiFi configured for WPA2 N-only connection. I'm also using 'less crowded' channel.

Below is the ping statistics between my machine and the router:

Ping statistics for 192.168.0.1:
    Packets: Sent = 3603, Received = 3535, Lost = 68 (1% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 1746ms, Average = 13ms

Appreciate your help!


Source: (StackOverflow)

Raspberry Pi Wifi error: "Association request to the driver failed" [closed]

I am unable to connect to WiFi with my Raspberry Pi. There is no password on the WiFi network, using NetworkManager. /var/log/syslog states that "Association request to the driver failed", and Google seems to say that is the generic error message.

How can I figure out what the real error is?


Source: (StackOverflow)

wifi driver missing after installing windows 8.1

I had windows 10 earlier.Today i installed windows 8.1 by erasing windows 10.But now i find in the device manager that the network adapter for wireless network and ethernet adapter are missing. Hence i am not able to use wifi.

Why did it happen and how to resolve this problem ? I was able to use wifi earlier while using windows 10.


Source: (StackOverflow)

Wifi very slow on Linux Mint 17, works fine on Windows

My wifi is working just fine on Windows in my new ASUS X450L notebook but is unbearably slow (often becoming unresponsible) on my dual boot Linux Mint 17. I believe it is a problem with the drivers.

uname -a Linux bernardes-PC 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

lshw -class network

WARNING: you should run this program as super-user.
  *-network               
       description: Ethernet interface
       product: QCA8171 Gigabit Ethernet
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth1
       version: 10
       serial: 10:c3:7b:c1:ee:7f
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=alx latency=0 link=no multicast=yes port=twisted pair
       resources: irq:63 memory:f7900000-f793ffff ioport:e000(size=128)
  *-network
       description: Wireless interface
       product: RT3290 Wireless 802.11n 1T/1R PCIe
       vendor: Ralink corp.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan1
       version: 00
       serial: 54:35:30:57:2a:39
       width: 32 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rt2800pci driverversion=3.13.0-37-generic firmware=0.37 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:19 memory:f7810000-f781ffff
  *-network
       description: Wireless interface
       physical id: 2
       bus info: usb@1:1.3
       logical name: wlan2
       serial: 64:70:02:2d:9e:f1
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=ath9k_htc driverversion=3.13.0-37-generic firmware=1.3 ip=192.168.10.101 link=yes multicast=yes wireless=IEEE 802.11bgn
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

The important part:

       product: RT3290 Wireless 802.11n 1T/1R PCIe
       vendor: Ralink corp.

I am kind of lost as I am not very experienced with network/drivers magic in Unix.


Source: (StackOverflow)

Windows 10 wifi cannot connect - Intel pro 3945abg wireless card

I try to connect to the network on windows 10, but it always says "could not connect to network".

The intel website says that the pro 3945abg is not supported for windows 10.

How do I get this working?

EDIT:

Things I have tried so far:

I downloaded the following driver:

Intel® PROSet/Wireless Basic Enterprise for IT Administrators: Windows 7 64-Bit*

File name: Wireless_14.3.1_Ds64.zip

Version: 14.3.1 (Previously released)

Date: 03/12/2012

Size: 7.61 MB Language: English Operating Systems: Windows 7, 64-bit*

https://downloadcenter.intel.com/download/21049

This doesn't entirely fix the problem. Restarting the computer causes the problem to reoccur. running iprodifx.exe provided in the file will bring the connection back, but I dont know what is causing it to loose the settings.

Also:

uninstall the driver for the wifi card, so that it is forced to use the generic driver

After trying #2, it appears to work for a bit, but soon reverted to being unable to connect after restarting or resuming.


Source: (StackOverflow)

Enterprise laptop doesn't recognize WiFi

My cousin is using an enterprise laptop for home work, but for some reason she can't connect to her home WiFi. The laptop isn't able to detect any WiFi networks, although she used to be able to detect and connect to the network.

Whenever I troubleshoot for possible issues, Windows Vista is telling me the switch for wireless reception is turned off, but I'm sure it's turned on (If I turn it on, the HP Wireless Assistant tells me it's turned on, so...).

But if I take a look at the settings, I get this message (sorry it's in Dutch):

enter image description here

So for some reason, the WLAN reception is deactivated and I cannot activate this...

Does this have something to do with the laptop being an enterprise laptop? Or is there a simple setting I missed?

The most recent driver of the Wireless Network Card (Intel Wireless 5100) is installed.


Source: (StackOverflow)

Dell Inspiron 5520 laptop wifi shows limited connection

I have a Dell Inspiron 15R 5520 laptop with Windows 8.1 64-bit installed. It works fine for a couple of hours, and suddenly the wifi start showing limited connection and I'm unable to access the internet while other devices, such as phones and tablets, are working fine at the same time.

Now when I disconnect and reconnect the laptop's wifi or I disable and re-enable the wifi, it starts working, or if I leave it alone for some time it reconnects by itself after 5-10 minutes.

I have:
• Dell Wireless 1704 802.11b/g/n
• Driver version: 6.30.59.26
• Driver date: 7/9/2012
• Wireless adapter: Broadcom

I'm not sure if there is any hardware issue. I have tried reinstalling the wifi driver, but I had no luck.


Source: (StackOverflow)

Acer Aspire V5 wifi connection drops & proximity issue

I am having a weird problem on Windows 10 with my wireless adapter recently. My wifi connections perform very poorly when my laptop is not in line-of-sight with the router. As soon as there is something between my laptop and the router, like when I move to a different room, the throughput starts dropping significantly to a point where my browser gets stuck and the wifi connection gets dropped and I cannot connect to it again until I am back in the same room as the router.

  1. This has started happening since I performed a clean install of Windows 10.
  2. This happens only on 2.4 GHz networks. 5 GHz networks work flawlessly.
  3. I have Ubuntu installed natively as a second OS & I don't see this problem there. So i guess my hardware is not at fault here.
  4. I never had such an issue with Windows 7, 8, 8.1 previously.
  5. wifi signal strength is not an issue.

I have tried:

  1. different driver versions.
  2. different wifi networks on different routers in different locations with different levels of interference.
  3. changing every available router setting value.
  4. changing every available adapter settings properties.
  5. Google, Windows 10 Feedback app, Microsoft help.
  6. everything else i could think of.

System Info:
Acer Aspire V5-573PG-9610
Windows 10 Pro with latest updates
Qualcomm Atheros AR5BWB222 wireless adapter

I have been trying to tackle this issue for over a couple of months now. Has anybody encountered such an issue? Can anybody suggest anything that I might have missed? Thanks.

Update: A full PC reset also failed to solve the issue


Source: (StackOverflow)

Generic WiFI USB adapter drivers

I have a usb WiFI adapter that I lost the installation cd the only identification numbers that it has is

wlan 11n mini usb adapter fcc id: Wklwl 6203 s/n 27110262066

A google search doesn't come up with anything is there anything that I can do to get Windows XP to identify it.


Source: (StackOverflow)

Disable hosted network support in a Windows WiFi driver

What

How can I alter my Surface Pro's WiFi adapter to remove its support for the Hosted Network feature in Windows? I don't want to disable the hosted network feature for ALL adapters, just for one. I want to do this so that it will use a different adapter for the hosted network.

Why

I have a Microsoft Surface Pro 3. They messed up, and the built in WiFi adapter does not work properly. It cannot start a hosted network. I have an external adapter I can use for this purpose. It works great, except you cannot tell Windows which adapter to bind the virtual miniport adapter to. Because support for that feature is a requirement for new drivers, the crappy built in adapter claims to support it (but doesn't really). This means every time I want to start the hosted network feature I have to disable the built in adapter in the device manager, enable the hosted network, then re-enable the built in adapter. I still use the built in adapter, and sometimes use both at the same time. So I'm hoping there is some way I can turn off the support in that driver so it will be ignored by the hosted network feature without having to be fully disabled.


Source: (StackOverflow)

What is the "quality" of a Wi-Fi access point?

In Debian you can use iwlist to scan nearby Wi-Fi access points. In the statistics like this:

Cell 01 - Address: CC:B2:55:XX:XX:XX
                ESSID:"X"
                Protocol:IEEE 802.11bg
                Mode:Master
                Frequency:2.412 GHz (Channel 1)
                Encryption key:on
                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                          9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                          48 Mb/s; 54 Mb/s
                Quality:33  Signal level:0  Noise level:0
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : CCMP
                    Pairwise Ciphers (1) : CCMP
                    Authentication Suites (1) : PSK
                Extra: Last beacon: 252ms ago

There is a field called "quality". I can understand what "signal level" means, it is RSSI (Received Signal Strength Indication). However, what does "quality" mean really? How is it measured?

Meanwhile, on my Ubuntu 12.04 LTS laptop, it is weird because the "signal level" fields of all scanned access points are 0, so are the "noise level" fields. But on my Raspberry Pi which has Raspbian, I can see "quality", "signal level", and "noise level" fields have different readings. (This is not the primary problem, but if you know the answer please just breifly describe a little bit.)


Source: (StackOverflow)