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COB 204 Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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COB 204 Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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COB 204 Exam | Questions And Answers Latest {2024- 2025} A+ Graded | 100% VerifiedWireless - without wires
Mobile - something that changes its location over time
Mobile Computing - a real-time, wireless connection between a mobile device and other computing
environments, such as Internet or an intranet
Mobile Commerce (or M-Commerce) - e-commerce (EC) transactions conducted with a mobile device
Pervasive Computing (or Ubiquitous Computing) - virtually every object has processing power with
either wireless or wired connections to a global network
Dematerialization - a phenomenon that occurs when the functions of many physical devices are included
in one other physical device. Consider that your smartphone includes the functions of digital cameras for
images and video, radios, televisions, Internet access via Web browsers, recording studios, editing
suites, movie theaters, GPS navigators, word processors, spreadsheets, stereos, flashlights, board
games, card games, video games, an entire range of medical devices, maps, atlases, encyclopedias,
dictionaries, translators, textbooks, watches, alarm clocks, books, calculators, address books, credit card
swipers, magnifying glasses, money and credit cards, car keys, hotel keys, cellular telephony, Wi-Fi, e-
mail access, text messaging, a full QWERTY keyboard, and many others.
Advantages of Satellite - high bandwidth, large coverage area
Disadvantages of Satellite - expensive, must have unobstructed line of sight, signals experience
propagation delay, must use encryption for security
3 Types of Satellites Circling the Earth - 1. Geostationary-Earth-Orbit (GEO)
2. Medium-Earth-Orbit (MEO)
3. Low-Earth-Orbit (LEO)
, Footprint - the area of Earth's surface reached by a satellite's transmission overcomes the limitations of
microwave data relay stations. The higher a satellite orbits, the larger its footprint.
Propagation Delay - One major limitation of GEO satellites is that their transmissions take a quarter of a
second to send and return from the earth's surface
Internet Over Satellite (IoS) - in remote parts of the world it is the only option available for Internet
connections because installing cables is either too expensive or physically impossible
Medium-Range Wireless Networks - the familiar wireless local area networks (WLANs) and the most
common type of Medium-Range network is wireless fidelity (Wi-Fi)
Wireless Fidelity (Wi-Fi) - a medium-range WLAN
Wireless Mesh Networks - 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
Wireless Access Point - a Wi-Fi medium range WLAN and a typical configuration includes a transmitter
with an antenna
Hotspot - a wireless access point that provides service to a number of users within a small geographical
perimeter (up to approximately 300 ft)
Wi-Fi Direct - enables peer-to-peer communications, so devices can connect directly allowing users to
transfer content among devices without having to rely on a wireless antenna. It can connect up pairs or
groups of devices at Wi-Fi speeds of up to 250 Mbps and at distances of up to 800 ft
MiFi - a small, portable wireless device that provides users with a permanent WiFi hotspot wherever
they go with a range of about 10 meters (roughly 30 ft)
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