Chapter 10 Communications and Networks

communications channel
medium used to convey info from a sender to a receiver
kind of communications device that sends and receives data and info to and from a digital line such as ISDN and cable
modem
offer mobile users the ability to connect to the Internet with their Wi-Fi enabled wireless
hotspot
the design of a computer network that includes the hardware, software, access methods and protocols used
network architecture
network servers and web servers are examples of what type of server
dedicated
all of the computers and devices on the network connect to a central device
star network
cables have the capability of carrying significantly more signals than wire cables
fiber optics
how many wired and or wireless computers and mobile devices might a router be able to connect
more than 200
WiMax
a network standard developed by IEEE that specifies how wireless devices communicate over the air in a wide area
in _________ wire, each cable consists of two separate insulated copper wires that are twisted together
twisted pair
kind of technology your new mobile phone payment device will most likely use
NFC
cover a range of about 30ft
computer network organized around an individual person not a group
can be constructed with cables or be wireless
PAN
used to connect LANs and other types of networks
allows users and computers in one location can communicate with users and computers in other locations
WAN
wide area network
microwave transmissions involves sending signals from one microwave station to another what is this often called?
fixed wireless
this is a simple inexpensive network that typically connects fewer than 10 computers
peer to peer
a network ______ refers to the layout of the computers and devices in a communications network
topology
the ____ generation of cellular transmissions is expected to provide artificial intelligence capabilities on wearable devices
5th
kind of technology your new remote control most likely will use
IRDA
infrared data Association
a network topology in which a cable forms a closed loop, with all computers and devices arranged along it
Ring
Which of the following is true of broadcast radio with regard to physical transmission media?
It is slower and more susceptible to noise.
Who invented the Ethernet?
Robert Metcalfe
What type of media transmits multiple signals simultaneously?
broadband
Which of the following is the data transfer rate equivalent to one million bits per second?
mbps
On what kind of network, such as that illustrated in the accompanying figure, do one or more computers act as a server and the other computers on the network request services from the server?
client/server
Which of the following technologies is your new mobile phone payment device most likely to use?
NFC
One of the more widely used transmission media for network cabling and landline phone systems is twisted-pair cable
true
What is a sending device?
device that initiates an instruction to transmit data, instructions, or information
Which of the following terms is the time it takes a signal to travel from one location to another on a network?
latency
Phone networks, the Internet, and other networks with large amounts of traffic use ATM.
true
An extranet essentially is a small version of the Internet that exists within an organization.
false
Which of the following terms is an electrical disturbance that can degrade communications?
noise
What term is used to describe the time it takes a signal to travel from one location to another on a network?
latency
Communications software usually is bundled with the operating system or communications devices.
true
Some smartphones can function as a wireless modem, called a mobile hot spot, when tethered to a personal computer.
true
You are a technology expert and you have been asked to predict which technology will become the Internet standard for data transmission, replacing T3 lines. Which of the following are you most likely to predict?
ATM
Which of the following has the fastest maximum transfer transmission rate?
UWB
On a network such as the one illustrated in the accompanying figure, what kind of computer controls access to the hardware, software, and other resources on the network and provides a centralized storage area for programs, data, and information?
host
Which of the following has a port to which a cable connects in order to coordinate the transmission and receipt of data, instructions, and information to and from the computer or device containing it?
network interface card
Consumers can purchase blank NFC tags at a reasonable cost and easily program them to perform certain actions.
true
ISDN is more widely used now than in the past.
False
You are purchasing a new mobile phone, and are learning about categories of cellular transmissions. You ask the sales person what the ‘G’ stands for in the categories 1G, 2G, 3G, and 4G. What does he reply?
generation
Bus networks are unpopular on LANs because they are expensive and difficult to install.
False
About which of the following do privacy advocates worry can destroy a person’s anonymity?
RFID
What is the maximum transfer transmission rate for Bluetooth?
24 Mbps
What is the approximate distance most Bluetooth devices can be from each other to communicate, without using additional equipment?
33 ft
What is the definition of a protocol, as it applies to networks?
a standard that outlines characteristics of how two network devices communicate
On a network such as the one illustrated in the accompanying figure, if one node fails, as long as that node is not providing services to other nodes on the network, what happens?
only that node is affected
Which of the following kinds of devices is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device?
communications
Which of the following is a network standard that specifies no central computer or device on the network should control when data can be transmitted?
Ethernet
Which of the following technologies is your new remote control most likely to use?
IRDA
What does EFT stand for?
Electronic Funds Transfer
On a token ring network, a packet is a special series of bits that function like a ticket, allowing the device with the packet to transmit data over the network.
False
IP hijacking is one of the largest Internet security threats.
True
The design of computers, devices, and media in a network is categorized as either client/server or peer-to-peer. What is the term used to refer to this characterization?
network architecture
You want to use the UMB cellular transmission standard on your new mobile phone. Which standard will you use?
4G
An extranet essentially is a small version of the Internet that exists within an organization.
False
a star network consists of a single central cable, to which all computers and other devices connect.
false
When users log off a P2P network like the one in the accompanying figure, other users still can access their hard disks.
False
Which of the following is a communications device that connects multiple computers together and transmits data to its correct destination on a network?
router
Which of the following is not a technology used by hot spots?
UWB
Wireless access points have high-quality antennas for optimal signals.
true
on a ring network, if the hub fails the entire network is inoperable until the hub is repaired
false
which statement best describes how the RFID standard works
the network uses radio signals to communicate with a tag placed in or attached to an object, animal, or person
A GPS receiver is a handheld, mountable, or embedded device that contains an antenna, a radio receiver, and a processor.
True
Transmission from a satellite to an earth-based station is called an uplink.
False
On a client/server network, the client sometimes is called a host computer.
False
One of the more widely used transmission media for network cabling and landline phone systems is twisted-pair cable.
True
With FTTP service, an optical terminal at your location receives the signals and transfers them to a router connected to a computer.
True
Which of the following technologies is your new inventory tracking system at your small business most likely to use?
UWB
In reference to computer communications, what does the term noise mean?
Users connected to a network have access to software on the network.
true
Which of the following is a simple, inexpensive network that typically connects fewer than 10 computers?
peer to peer network
Network servers and web servers are examples of what type of server?
dedicated servers
You are a technology expert and you have been asked to predict which technology will become the Internet standard for data transmission, replacing T3 lines. Which of the following are you most likely to predict?
ATM
Each token ring network has several tokens.
False
Which of the following is an earth-based reflective dish that contains the antenna, transceivers, and other equipment necessary for microwave communications?
microwave station
What term describes the process in which two or more computers or devices transfer data, instructions, and information?
digital communication
Which of the following is true of the installation of a network like the one shown in the accompanying figure?
It can span a larger distance than a bus network, but it is more difficult.
Which of the following communications technologies does not use broadcast radio signals?
IR
What is another term for an Internet peer-to-peer network?
a file sharing network
Which of the following best describes DSL connections?
transmits at fast speeds on existing standard copper telephone wiring; popular for small business or home user
A WLAN cannot communicate with a wired LAN.
false
Which network type connects each computer and device to a central device?
a star network
You love to take pictures of your family. What standard do you use to print pictures directly from your camera?
UWB
Only small networks use routers.
False
Which of the following did Sven Mattisson and Jaap Haartsen invent?
Bluetooth