Wireless

Question 1

What are the wireless technologies?

Answer 1

1. Wireless and mobile devices
2. Wireless transmission media
3. Wireless security

Question 2

What are the adv and disadv of wireless devices?

Answer 2

Adv for users:
1. Small enough to carry or wear
2. Sufficient computing power to perform productive tasks
3. Communicate wirelessly with internet

Disadvantage for businesses:
Workers can capture and transmit sensitive confidential or proprietary information

Question 3

What is wireless transmission media and what are the types?

Answer 3

• Transmit signals without wires

Major types:
- Microwave
- Satellite
- Radio

Question 4

Types of telecommunication satellites

Answer 4

1. Geo–> relative point on earth, expensive, delay
2. Meo –> satellites move relative to point on earth, medium-power transmitters needed, negligible delay, les expensive
3. Leo –> Satellites move rapidly, large number needed, low-power transmitters needed, negligible delay, least expensive

Question 5

What is a GPS

Answer 5

Wireless system utilizing satellites to enable users to determine their position on Earth. It is useful for navigating, mapping, surveying, 911

Question 6

What is google loon?

Answer 6

Balloons provide access by creating aerial wireless networks

Question 7

What are internet blimps

Answer 7

Provide functionality of cellular towers with a larger footprint

Question 8

What is radio transmission

Answer 8

It uses radio wave frequencies to send data directly to transmitters and receivers, high speed, wifi and cellular also use radio wave frequencies

Question 9

Adv and disadvantages of microwave

Answer 9

1. High bandwidth
2. Relatively inexpensive
3. Needs unobstructed line of sight
4. Susceptible to environmental interference

Question 10

Adv and disadvantages of satellite

Answer 10

1. High bandwidth
2. Large coverage area
3. Expensive
4. Needs unobstructed line of sight
5. Signals experience propagation delay
6. Needs encryption for security

Question 11

Adv and disadvantages for radio

Answer 11

1. High bandwidth
2. Signals pass through walls
3. Inexpensive and easy to install
4. Creates electrical interference problems
5. Susceptible to snooping unless encrypted

Question 12

Threats to wireless networks

Answer 12

Transmissions can be intercepted by people close enough and have access to appropriate equipment

Rogue access point: unauthorized access to a WLAN

Evil twin attack: impostor with a computer connects to yours, pretending to be your normal access point

War driving: walking around to find insecure WLANs to connect to

Eavesdropping: unauthorized users try to access data travelling over wireless networks

Radio frequency jamming: person or device intentionally or unintentionally interferes with your wireless network transmissions

Question 13

Types of wireless computer networks

Answer 13

1. Short range wireless networks
2. Medium range WN
3. Wide are WN

Question 14

Types of short range wireless networks

Answer 14

Bluetooth
Ultra-wideband
Near-field communications

Question 15

Types of medium range wireless networks

Answer 15

Wifi
Wifi direct
Mifi
Lifi

Question 16

Types of wide are wireless networks

Answer 16

Cellular radio
Wireless broad mac WiMAX

Question 17

What is bluetooth

Answer 17

used to create small personal area networks PAN

Application: IoT, wireless handsets

Question 18

What is ultra wideband UWB

Answer 18

High bandwidth wireless technology with transmission speeds in excess of 100 Mbps

Question 19

What is the near field communications

Answer 19

Shortest range of any short-range wireless networks

designed to be embedded in mobile devices such as cell phones and credit cards

Question 20

What is wifi

Answer 20

Wireless local area network WLAN

Wireless access point connects to a wired LAN or to satellite dishes that provide an Internet connection

Question 21

What is wifi direct

Answer 21

new generation of wifi, enables peer to peer communications, devices connect to each other directly and transfer content without wireless antenna, challenges bluetooth in the area of device to device networking (greater range, faster data transfer)

Question 22

what is mifi

Answer 22

Small portable wireless device that provides users with permanent wifi hotspot wherever they go, 10 meters of range

Question 23

what is lifi

Answer 23

Similar to wifi

Difference:
Lifi uses ultraviolet and infrared radiation, greater bandwidth, high data transmission rate, more effective in areas susceptible to electromagnetic interference, enhanced security, large number of devices coverage

Question 24

What is wireless broadband (WiMAX)

Answer 24

Worldwide interoperability for microwave access

range for 50km, data transfer rate of 75 Mbpsd, secure, antennas can transmit broadband internet to far away, long distance broadband wireless access to rural areas and other locations

Question 25

what is cellular radio

Answer 25

1st gen (analog)
2nd gen (digital)
2.5 gen (Digital + voice and data)
3G (digital + video, web, IM, higher bandwidth)
4G (Amended mobile web access, IP telephony, gaming services, high definition mobile TV, video conferencing and 3D TV)
5G: connected t the internet and telephone network by radio waves through a local antenna in the cell, greater bandwidth, higher download speeds, new application of IoT and machine to machine areas

Question 26

What is internet of things

Answer 26

system in which any object has a unique identity and is able to send and receive info over a network

requires use of wireless sensors and 2 technologies to support the IoT infrastructure: Radio frequency identification and wireless sensor networks

Question 27

What is a QR code

Answer 27

2D code readable by dedicated QR readers and camera phones

Question 28

What is RFID code

Answer 28

system uses tags with embedded microchips, which contain data and antennas to transmit radio signals over a short distance to RFID readers