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Computer Science Ch. 7

Terms

undefined, object
copy deck
"switched, dial-up" means . . .
when you dial a telephone number, a circuit is temporarily established between the caller and callee
dedicated point-to-point lines
directly connect two machines without the use of of shared channels found on a LAN
hub
has a number of ports, with a wire leading from each port to an ethernet interface in the wall of a room in the building
packet
an information block with a fixed maximum size that is transmitted through the network as a single unit
shared cable
a wire is literally strung around and through a building
star network
has a single central node that is connected to all other sites, and it can route information directly to any other node in the LAN
wireless local access network
user transmits data to base station, base station connects to wired network such as dsl, cable modem
wireless wide-area access network
computer transmits messages to remote base station, which is usually a large antenna placed on top of a tower or building
A bridge, also called a switch, is a . . .
"smarter" version of a repeater that has knowledge about the nodes located on each separate network.
A repeater is a device that . . .
amplifies and forwards a signal.
A digital subscriber line's wires are . . .
the same as your home telephone wires.
a modem modulates or alters . . .
a standard analog signal called a carrier so that it encodes binary information
A regional or national ISP might connect to . . .
an international ISP, which provides global coverage.
A user taps into a shared cable at it's nearest point, using a device called a ___________.
transceiver
A user's individual computer or a company's private network is connected to the world through . . .
an Internet Service Provider, or ISP.
an analog medium . . .
the physical quantity used to represent information, usually voltage level, is continuous and can take on any value
digital information is . . .
a sequence of 0s and 1s
Gigabit networking:
transmission lines that support speeds in excess of 1 billion bits per second.
If a DSL is assymetric, it means that . . .
it does not have the same transmission speed in the download direction as in the upload direction.
In a WAN, a message must . . .
"hop" from one node to another to make its way from source to destination.
In the bus topology,
all nodes are connected to a single shared communication line.
In the commercial and office environment, the most widely used broadband technology is . . .
the Ethernet.
In the ring topology,
the network nodes are connected in a cirucular fashion, with messages ciruclating around the ring in either a clockwise or counterclockwise direction until they reach their destination.
Individual networks are connected through a ______.
router
It is the job of the data link protocols to . . .
determine the beginning and end of each message contained within a continuous raw data stream.
It is the job of the network layer protocols to . . .
deliver a message from the site where it was created to its ultimate destination.
It is the job of the transport layer protocols to . . .
assign port numbers to programs and remember which program goes with which port.  It is also designed to eliminate errors in the data.
The application layer protocols are . . .
the rules for implementing the end-user services provided by a network, and they are built on top of the four protocol layers.
The physical layer protocols govern . . .
the exchange of binary digits across a physical communication channel.
The ability to deliver data to users regardless of their location is called ___.
mobile computing
The concept of internetworking stated . . .
that any WAN is free to do whatever it wants internally.
The Ethernet uses ___ topology.
bus
The first level of hierarchy in the structure of an ISP:
the local ISP, which individual users or company networks connect to.
the high error rate and low capacity of a switched telephone line is called ___
bandwidth
The individual computers on the network are referred to as . . .
nodes, hosts, or end systems
The local ISP connects to . . .
a regional or national ISP that interconnects all local ISPs in a single geographic region or country.
The term broadband generally refers to . . .
any communication link with a transmission rate exceeding 256,000 bps.
The two main broadband options are . . .
digital subscriber lines (DSL) and cable modems.
The unit of transmission in a WAN is a ______.
packet
To connect to a network with a hub . . .
a port is activated by flipping a switch and users can then simply plug their computers in to the wall socket.
when a modem performs a demodulation, it . . .
takes the received waveform, separates the carrier from the encoded digital signal, and passes the digital data on to the computer
Wireless transmitters must be placed on top of hills or tall buildings because of . . .
the curvature of the earth.

Deck Info

42

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