Section 16: Book Chapter 20 - Wireless Networking

How many channels are there in regards to the 2.4 GHz bands?

14 in Japan 13 in the UK 11 in the US

Would you usually manually set up a 2.4 GHz band or a 5 GHz band?

2.4 is typically set up manually and 5 has a feature that allows for automatically assigning.

What is the range of the 2.4 GHz band?

2.412 - 2.4884 GHz

What are the Bluetooth classes and how many are there?

3 classes: Class Power Range Class 1 - 100 mW - 100 m Class 2 - 2.5 mW - 10 m Class 3 - 100 mW - 1 m

What is the range of the 5 GHz band?

5.150 - 5.875 GHz

Which 802.11 standard runs on 5GHz? A. 802.11a B. 802.11b C. 802.11g D. 802.11c

802.11a

What are the four extensions of 802.11?

802.11a - 54 Mbps - 5 GHz 802.11b - 11 Mbps - 2.4 GHz 802.11g - 54 Mbps - 2.4 GHz 802.11n - 100 Mbps - 2.4 GHz / 5GHz

What is a WMN?

A Wireless Mesh Network is a networks using multiple Wi-Fi access points to create a wide area network that can be quite large and are essentially a series of interconnected local area networks.

What is ad hoc mode?

A peer-to-peer wireless configuration where each wireless workstation talks directly to other workstations.

Which is not a wireless radio technology found in computers, tablets or phones? A. Infrared B. Bluetooth C. RFID D. NFC

A. Infrared

How many channels are there in regards to the 5 GHz bands?

About 25 channels ranging between 36-165

What does Enable Wireless Radio do?

Allows the router to be found by wireless devices, and there is a feature you can use that will hide it from showing up on as an option to connect while still technically broadcasting a signal.

Which is not true of wireless mesh networks? A. Mesh networks have a single base station B. Mesh networks are best for large enterprise networks C. Mesh networks have one or more beacon/satellite stations D. Mesh networks provide wide coverage in homes and small offices

B. Mesh networks are best for large enterprise networks

Which is not a Wi-Fi capable device? A. WAP B. Switch C. Smartphone D. Tablet

B. Switch

Which is most likely to prevent a device from connecting to a previously-used Wi-Fi network? ​ A. The antenna(s) are poorly oriented. B. The SSID has changed. C. Too many devices are accessing the WAP. D. The WAP is disconnected from the Internet.

B. The SSID has changed

What is a wireless network card?

Can snap in via PCIe or through USB but it allows whatever system it plugs into to receive a wireless signal.

What should you check if you have no connectivity at a place you used to be able to connect to?

Could be trying to reach an outdated profile because of a password/SSID change, or if someone turns of SSID broadcast in which you will have to manually configure a profile knowing the SSID, WPA type, and Passwords.

Which should you try first if your device can't connect to a remembered public wireless network? A. Increase the transmit power on the SOHO router B. Connect to the SOHO router with a cable C. Reset the SOHO router to factory defaults D. Delete the profile and try to connect again

D. Delete the profile and try to connect again

How would you fix a Low RF signal?

Get closer to the SSID and check your antennas direction.

What is IEEE 802.11?

IEEE subcommittee that defined the standards for wireless.

How would you fix Limited Connectivity?

If a wall was put in between the WAP and you or if there are some other wireless device such as baby monitors throwing off the signal could be causing it so the best thing to do is remain as close as possible to it and block and things that may interrupt your transfer speeds.

Where is the antenna kept in a laptop device?

In the monitor

What is NFC stand for and what does it do?

Near Field Communication and it is a protocol, based on RFID, that defines how a network uses close-range radio signals to communicate between two devices or objects equipped with NFC technology

What does RFID stand for and what does it do?

Radio Frequency Identification is a system of tags which contain data that can be read from a distance using radio waves.

What does SSID stand for and what is it?

Service Set Identifier, and it is the name displayed for your wireless network.

Industrial, Scientific, and Medical (ISM)

The 2.4GHz and 5-GHz bands are referred to as the ISM bands (range of radio frequencies).

What two things are required to connect to a network?

The SSID and the Network Key (Password)

How would you fix Intermittent connectivity?

The connection works either really well or not at all. Most likely a low RF signal issue, or there are too many people on the wireless network. The best solution would be to buy more WAP's, or establish QoS (Quality of Service) for certain computers to gain priority.

Service Set Identifier (SSID)

The user-supplied network name of a WLAN; it can generally be alphanumeric from 2 to 32 characters.

How many types of antennas are there?

There are three types of antennas: 1. Omni-directional - Dipole - Two Omnidirectional facing opposite poles 2. Patch 3. Highly Directional

What kind of encryption would you use on a Mesh network?

Trick Question Mesh Networks come out of the box already preconfigured with their own form of encryption so all that is required is a SSID and Password.

What is Tap to Print/Pay?

Using RFID Technology it allows you to use your phone to scan either your phone on a printer to send a request or using apple pay on your phone to pay for something.

What could be a useful tool for identifying wireless problems?

Wi-Fi analyzers

What is Infrastructure mode

Wireless networking mode that uses one or more WAPs to connect the wireless network nodes to a wired network segment.

What is special about 802.11ac?

Wireless networking standard that operates in the 5-GHz band and uses multiple in/multiple out (MIMO) and multi-user MIMO (MU-MIMO) to achieve a theoretical maximum throughput of 1 Gbps. Typically will have 2.4 GHz radio in there for backwards compatibility capabilities.

is 802.11g compatible with 802.11b?

Yes through backward compatibility and they both run on 2.4.

Can you have more than one SSID (Service Set Identifier) on a WAP (Wireless Access Point)

Yes you can have multiple channels on a single WAP.

What is a wireless access point

a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network

What is Bluetooth?

a wireless PAN (Personal Area Network) technology that transmits signals over short distances among cell phones, computers, and other devices. Only one device to one device.

What is multiple-in/multiple-out (MIMO) technology

have multiple transmitters and receivers, allowing them to send and receive greater amounts of data than traditional networking devices. Only on 802.11n