Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices Discovering Computers 2016 Page 1 Table of Contents Tap or click any topic below to view its content. TABLE OF CONTENTS.............................................................................................................................................. 1 DISCLAIMER ........................................................................................................................................................... 3 SHARING HARDWARE, DATA, AND INFORMATION ................................................................................................ 4 HIGH-TECH TALK: STAR, BUS, AND RING NETWORK TOPOLOGIES.......................................................................... 5 STAR NETWORK ............................................................................................................................................................. 5 BUS NETWORK .............................................................................................................................................................. 5 RING NETWORK ............................................................................................................................................................. 6 FILE SHARING PROGRAMS ..................................................................................................................................... 8 MINI FEATURE 10-1: MOBILE COMMUNICATIONS ................................................................................................. 9 COMMUNICATIONS PACKAGES ..........................................................................................................................................9 Calling ...................................................................................................................................................................9 Messaging ............................................................................................................................................................. 9 Data ......................................................................................................................................................................9 MESSAGING APPS .......................................................................................................................................................... 9 Text/Picture/Video Messaging Apps ................................................................................................................... 10 Internet Messaging .............................................................................................................................................10 Voice and Video Calling.......................................................................................................................................11 ETHICS & ISSUES 10-2: DO THE BENEFITS OF TELEMEDICINE OUTWEIGH THE RISKS? ........................................... 12 Websites about Telemedicine ............................................................................................................................. 12 HIGH-TECH TALK: OSI REFERENCE MODEL ........................................................................................................... 13 TECHNOLOGY INNOVATOR: ROBERT METCALFE .................................................................................................. 16 SECURE IT 10-1: MONITORING NETWORK TRAFFIC .............................................................................................. 17 Websites about Monitoring Network Traffic ......................................................................................................17 FINDING LOCATIONS BASED ON IP ADDRESSES ................................................................................................... 18 802.11 STANDARDS ............................................................................................................................................. 19 LTE ....................................................................................................................................................................... 20 TECHNOLOGY INNOVATOR: AT&T ....................................................................................................................... 21 TECHNOLOGY INNOVATOR: VERIZON .................................................................................................................. 22 MINI FEATURE 10-2: BLUETOOTH TECHNOLOGY .................................................................................................. 23 BLUETOOTH-ENABLED OR BLUETOOTH-ENHANCED DEVICES.................................................................................................23 BLUETOOTH TECHNOLOGY IS STANDARDIZED GLOBALLY ......................................................................................................23 SECURE IT 10-2: PREVENTING BLUEBUGGING ...................................................................................................... 25 Websites about Preventing Bluebugging ............................................................................................................25 RFID TAGS ............................................................................................................................................................ 26
39
Embed
Table of Contents - Cengage · 2015. 4. 15. · Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices Discovering Computers 2016 Page 5
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 1
Table of Contents Tap or click any topic below to view its content.
TABLE OF CONTENTS .............................................................................................................................................. 1
SHARING HARDWARE, DATA, AND INFORMATION ................................................................................................ 4
HIGH-TECH TALK: STAR, BUS, AND RING NETWORK TOPOLOGIES .......................................................................... 5
STAR NETWORK ............................................................................................................................................................. 5 BUS NETWORK .............................................................................................................................................................. 5 RING NETWORK ............................................................................................................................................................. 6
MESSAGING APPS .......................................................................................................................................................... 9 Text/Picture/Video Messaging Apps ................................................................................................................... 10 Internet Messaging ............................................................................................................................................. 10 Voice and Video Calling ....................................................................................................................................... 11
ETHICS & ISSUES 10-2: DO THE BENEFITS OF TELEMEDICINE OUTWEIGH THE RISKS? ........................................... 12
Websites about Telemedicine ............................................................................................................................. 12
HIGH-TECH TALK: OSI REFERENCE MODEL ........................................................................................................... 13
TECHNOLOGY INNOVATOR: ROBERT METCALFE .................................................................................................. 16
SECURE IT 10-1: MONITORING NETWORK TRAFFIC .............................................................................................. 17
Websites about Monitoring Network Traffic ...................................................................................................... 17
FINDING LOCATIONS BASED ON IP ADDRESSES ................................................................................................... 18
MINI FEATURE 10-2: BLUETOOTH TECHNOLOGY .................................................................................................. 23
BLUETOOTH-ENABLED OR BLUETOOTH-ENHANCED DEVICES ................................................................................................. 23 BLUETOOTH TECHNOLOGY IS STANDARDIZED GLOBALLY ...................................................................................................... 23
SECURE IT 10-2: PREVENTING BLUEBUGGING ...................................................................................................... 25
Websites about Preventing Bluebugging ............................................................................................................ 25
RFID TAGS ............................................................................................................................................................ 26
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
SECURE IT 10-3: DETECTING AN INTRUDER ACCESSING YOUR WIRELESS HOME NETWORK ................................. 30
Websites about Detecting Wireless Home Network Intruders ............................................................................ 30
MINI FEATURE 10-3: PLANNING AND DESIGNING YOUR HOME NETWORK .......................................................... 31
FACTORS AFFECTING WIRELESS HOME NETWORK SPEEDS AND RANGES ................................................................................. 31
HOW TO 10-4: CREATE A HOME NETWORK ......................................................................................................... 32
Websites about Creating a Home Network ........................................................................................................ 32
ETHICS & ISSUES 10-3: SHOULD ISPS BE ALLOWED TO CAP YOUR INTERNET USAGE? .......................................... 33
Websites about Data Capping ............................................................................................................................ 33
SECURE IT 10-4: FAKE CELL TOWERS ARE TRACKING DEVICES .............................................................................. 36
Websites about Fake Cell Towers ....................................................................................................................... 36
ETHICS & ISSUES 10-4: SHOULD PHONE COMPANIES BE ALLOWED TO FORCE CUSTOMERS TO SWITCH FROM
LANDLINES TO MOBILE PHONES? ........................................................................................................................ 37
Websites about Phone Companies and Landlines ............................................................................................... 37
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 5
High-Tech Talk: Star, Bus, and Ring Network Topologies A network topology refers to the layout of the computers and devices in a communications network.
Three basic network topologies are star, bus, and ring. Most networks, including the Internet, use
combinations of these basic topologies. Thus, you should be familiar with the layout of communications
in these topologies.
Star Network On a star network, all of the computers and devices (nodes) on the network connect to a central device,
thus forming a star (Figure 1). All data that transfers from one node to another passes through the
central device, which can be a hub or a switch. Star networks are fairly easy to install and maintain.
Nodes can be added to and removed from the network with little or no disruption to the network. If one
node fails, only that node is affected (as long as that node is not providing services to other nodes on
the network). The other nodes continue to operate normally. If the central device fails, however, the
entire network is inoperable until the device is repaired. Most large star networks, therefore, keep a
duplicate of the central devices available in case the primary one fails.
Figure 1: A star network contains a single, central device through which all computers and devices on the network communicate.
Bus Network A bus network consists of a single central cable to which all computers and other devices connect
(Figure 2). The bus is the physical cable that connects the computers and other devices. The bus in a bus
network transmits data, instructions, and information in both directions. When a sending device
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 6
transmits data, the address of the receiving device is included with the transmission so that the data is
routed to the appropriate receiving device.
Bus networks are inexpensive and easy to install. One advantage of the bus and star networks is that
computers and other devices can be attached and detached at any point on the bus without disturbing
the rest of the network.
Another advantage is that failure of one device usually does not affect the rest of the bus network. The
greatest risk to a bus network is that the bus itself might become inoperable. If that happens, the
network remains inoperative until the bus is back in working order.
Figure 2: Devices on a bus network share a single data path.
Ring Network On a ring network, a cable forms a closed loop (ring) with all computers and devices arranged along the
ring (Figure 3). Data transmitted on a ring network travels from device to device around the entire ring,
in one direction. If a computer or device on a ring network fails, the entire network potentially could
stop functioning. A ring network can span a larger distance than a bus network, but it is more difficult to
install. The ring topology primarily is used for LANs, but it also is used in WANs.
Figure 3: On a ring network, all connected devices form a continuous loop.
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 7
If you have or were to create a home network, which network topology would be easiest for you
install and maintain?
Indicate whether the following statement is true or false by tapping or clicking your response, which
will open a browser window or tab that reveals whether your selection is correct or incorrect. Close the
window or tab when you are finished viewing it.
Two advantages of a ring network are that computers and devices can be attached and detached
without disturbing the network and that the rest of the network generally is not affected if one device
fails.
True
False
Tap or click here to return to the Table of Contents.
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 19
802.11 Standards The table below describes the various 802.11 standards. You can find additional information by entering
search text from the table’s Name column.
Name Description
802.11 The first WLAN standard created in 1997 by IEEE; maximum network bandwidth 2 Mbps; no longer in use
802.11a Created in 1999; maximum network bandwidth 54 Mbps; uses a regulated frequency spectrum; not compatible with 802.11b
802.11b Created in 1999; maximum network bandwidth 11 Mbps; home appliances sometimes interfered because the 802.11b technology used unregulated radio waves; not compatible with 802.11a
802.11ab Hybrid of 802.11a and 802.11b; connected devices cannot use both at the same time
802.11g WLAN products started supporting this standard in 2002 and 2003; maximum bandwidth speed 54 Mbps; broader range; backward compatible with 802.11b
802.11n Created in 2009; maximum bandwidth speed 300 Mbps; uses MIMO (Multiple In, Multiple Out) technology to increase range
802.11ac Maximum bandwidth speeds of 7 Gbps; backward compatible with previous versions; wider range
802.11ad Created in 2012; maximum bandwidth speeds of 7 Gbps
802.11af Also called White-Fi or Super Wi-Fi; uses open television white space frequencies; potential for long ranges, such as rural broadband; bandwidth speeds up to 568 Mbps
Indicate whether the following statement is true or false by tapping or clicking your response, which
will open a browser window or tab that reveals whether your selection is correct or incorrect. Close the
window or tab when you are finished viewing it.
802.11a is the fastest Wi-Fi standard.
True
False
Tap or click here to return to the Table of Contents.
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 23
Mini Feature 10-2: Bluetooth Technology The following sections discuss Bluetooth devices and standards.
Bluetooth-Enabled or Bluetooth-Enhanced Devices The following list identifies examples of devices that use Bluetooth. You can find additional information
by entering the text, bluetooth enabled, along with the appropriate list item, as search text.
Car stereos
Digital cameras
Gaming consoles
Handheld computers
Headsets
Media players
Modems
Printers
Smartphones
Tablets
Watches
Bluetooth Technology Is Standardized Globally Bluetooth technology is monitored by the Bluetooth Special Interest Group (SIG), which defines and
approves changes to Bluetooth standards. Although the SIG does not manufacture Bluetooth technology
products, its 20,000 members include telecommunications and technology manufacturers.
The following list identifies a few of the Bluetooth SIG members. You can find additional information by
entering the text, bluetooth, along with the appropriate list item, as search text.
Ericsson Technology Licensing
Intel
Lenovo
Microsoft
Motorola
Nokia
Toshiba
Have you used a Bluetooth device? If so, for what purpose? How was your experience? Can you think
of other benefits or risks to using Bluetooth?
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 24
Indicate whether the following statement is true or false by tapping or clicking your response, which
will open a browser window or tab that reveals whether your selection is correct or incorrect. Close the
window or tab when you are finished viewing it.
The SIG manufactures Bluetooth devices.
True
False
Tap or click here to return to the Table of Contents.
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 31
Mini Feature 10-3: Planning and Designing Your Home Network The following section discusses factors affecting wireless home network speeds and ranges.
Factors Affecting Wireless Home Network Speeds and Ranges The speed and range of your home wireless network can vary based on a variety of issues. The following
list identifies a few factors that may affect the speed and/or range of your home network.
Distance from the router
Interference from other devices, such as microwaves or phones
Number of devices online
Physical barriers, such as walls or large objects that block the wireless signals
Speed of the ISP
Which version of the IEEE 802.11 standard your network uses, such as 802.11a (54 Mbit/second)
or 802.11n (600 Mbit/second)
Have you ever set up a wireless network? If so, what additional obstacles did you encounter? Have
you ever tried to improve your network speed or range? If so, what measures did you take?
Indicate whether the following statement is true or false by tapping or clicking your response, which
will open a browser window or tab that reveals whether your selection is correct or incorrect. Close the
window or tab when you are finished viewing it.
The version of the IEEE 802.11 standard your network uses can affect the network speed or range.
True
False
Tap or click here to return to the Table of Contents.
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 36
Secure IT 10-4: Fake Cell Towers Are Tracking Devices The resources listed in the table below contain more information about issues related to fake cell
towers. As an alternative to tapping, clicking, or entering the web address, you can find desired
information by entering search text from the table’s Website Name or Description column.
Websites about Fake Cell Towers
Website Name Description Web Address
Business Insider Article titled “Everything We Know About The Mysterious Fake Cell Towers Across The US That Could Be Tapping Your Phone”
dscov.com/16/10s4a
Engadget Article titled “Fake cellphone towers hiding in plain sight, intercepting your phone calls”
dscov.com/16/10s4b
Popular Science Article discusses how interceptors across the United States can eavesdrop on calls and intercept text messages.
dscov.com/16/10s4c
Tap or click here to return to the Table of Contents.
Chapter 10 Free Resources COMMUNICATING DIGITAL CONTENT: Wired and Wireless Networks and Devices
Discovering Computers 2016 Page 37
Ethics & Issues 10-4: Should Phone Companies Be Allowed to Force
Customers to Switch from Landlines to Mobile Phones? The resources listed in the table below contain more information about phone companies and landlines.
As an alternative to tapping, clicking, or entering the web address, you can find desired information by
entering search text from the table’s Website Name or Description column.
Websites about Phone Companies and Landlines
Website Name Description Web Address
Daily Tech Article discussing the White House request that the FCC classify the Internet as a common carrier.
dscov.com/16/10e4a
Forbes Article titled “The End of the Wired Telephone Network is Coming...But Not Soon Enough”
dscov.com/16/10e4b
The Wall Street Journal Article titled “AT&T's Plan For the Future: No Landlines, Less Regulation”
dscov.com/16/10e4c
Tap or click here to return to the Table of Contents.