Wireless Flashcards
What are the wireless technologies?
- Wireless and mobile devices
- Wireless transmission media
- Wireless security
What are the adv and disadv of wireless devices?
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
What is wireless transmission media and what are the types?
- Transmit signals without wires
Major types:
- Microwave
- Satellite
- Radio
Types of telecommunication satellites
- Geo–> relative point on earth, expensive, delay
- Meo –> satellites move relative to point on earth, medium-power transmitters needed, negligible delay, les expensive
- Leo –> Satellites move rapidly, large number needed, low-power transmitters needed, negligible delay, least expensive
What is a GPS
Wireless system utilizing satellites to enable users to determine their position on Earth. It is useful for navigating, mapping, surveying, 911
What is google loon?
Balloons provide access by creating aerial wireless networks
What are internet blimps
Provide functionality of cellular towers with a larger footprint
What is radio transmission
It uses radio wave frequencies to send data directly to transmitters and receivers, high speed, wifi and cellular also use radio wave frequencies
Adv and disadvantages of microwave
- High bandwidth
- Relatively inexpensive
- Needs unobstructed line of sight
- Susceptible to environmental interference
Adv and disadvantages of satellite
- High bandwidth
- Large coverage area
- Expensive
- Needs unobstructed line of sight
- Signals experience propagation delay
- Needs encryption for security
Adv and disadvantages for radio
- High bandwidth
- Signals pass through walls
- Inexpensive and easy to install
- Creates electrical interference problems
- Susceptible to snooping unless encrypted
Threats to wireless networks
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
Types of wireless computer networks
- Short range wireless networks
- Medium range WN
- Wide are WN
Types of short range wireless networks
Bluetooth
Ultra-wideband
Near-field communications
Types of medium range wireless networks
Wifi
Wifi direct
Mifi
Lifi
Types of wide are wireless networks
Cellular radio
Wireless broad mac WiMAX
What is bluetooth
used to create small personal area networks PAN
Application: IoT, wireless handsets
What is ultra wideband UWB
High bandwidth wireless technology with transmission speeds in excess of 100 Mbps
What is the near field communications
Shortest range of any short-range wireless networks
designed to be embedded in mobile devices such as cell phones and credit cards
What is wifi
Wireless local area network WLAN
Wireless access point connects to a wired LAN or to satellite dishes that provide an Internet connection
What is wifi direct
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)
what is mifi
Small portable wireless device that provides users with permanent wifi hotspot wherever they go, 10 meters of range
what is lifi
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
What is wireless broadband (WiMAX)
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
what is cellular radio
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
What is internet of things
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
What is a QR code
2D code readable by dedicated QR readers and camera phones
What is RFID code
system uses tags with embedded microchips, which contain data and antennas to transmit radio signals over a short distance to RFID readers
