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UNIT  E  -  Fill in the Best Answer

1.       A communications ______ is the combination of hardware, software, and connecting links that transport data.


2.       With one bit, you can convey two units of information; with ____ bits, you can convey four units; with ____ bits, you can convey eight units; with ____ bits you can convey 256 units.

two, three, eight ~ 2, 3, 8

3.       ______ is the number of times that a wave oscillates.


4.       The _________, or capacity, of a digital channel is usually measured in bps.


5.       The ___________topology of a network refers to the layout of cables, devices, and connections; the _____ topology refers to the path of data over the network.

physical, logical

6.       A technology called _____ switching divides messages into small parcels and handles them on a first come, first served basis.


7.       _________ is one of the most widely used network technologies, and it uses a protocol called CSMA/CD to deal with collisions.


8.       The communications protocol used by devices such as a CB radio called ­­­­­­­­­­_______ duplex, makes it possible to send and receive data, but not at the same time.


9.       Protocols help two network devices negotiate and establish communications through a process called ________.


10.   When you use a dial-up connection, your ISP gives you a temporary address, called a(n) _______ IP address, for use as long as you remain connected.


11.   The database that keeps track of the names that correspond to IP addresses is called the _________name system.


12.   In communications terminology, __________means changing the characteristics of a signal, whereas ____________ means changing a signal back to its original state.

modulation, demodulation

13.   Although the speed of a modem was once measured by _________ rate, today’s modem transmission speeds are measured in bps.


14.    A software utility called _________sends a signal to a specific Internet address and waits for a reply.

Ping ~ Packet Internet Groper

15.   DSL, ISDN, _________, and T3 connections provide digital service over the telephone system’s “local loop.”


16.   DSS service uses a low-earth _______ to send television, voice, or computer data directly to a dish owned by an individual.


17.   A(n) _________ network uses radio frequencies instead of cables to send data from one network node to another.


18.   A(n) __________ is a low-power, wireless network designed for home use.


19.   _______ technology is a standard for low-cost personal area network connections among mobile users that uses a globally available frequency range.


20.   Single-user software might be installed on a LAN server, but would require a multi-user, concurrent-user, or ____________ license if more than one copy is to be used at a time.