UIT Chapter 6: Communications, Networks, & Cyberthreats

Analog refers to communications signals represented in a binary format. True False

False Analog means continuously varying (wavelike); binary is digital = either on or off (0 or 1).

Ethernet is a long-distance wireless communications connection. True False

False Ethernet is wired and is a relatively short-distance connection.

A Trojan horse pretends to be a useful program, such as a game or a screen saver, but it carries a virus that replicates in your computer over and over until your computer crashes. True False

False The Trojan horse does pretend to be a useful program, but it carries a virus that does damage without your knowledge—such as recording personal data and sending it over the Internet to "evil" computers for fraudulent use. (A worm is the replicating malware.)

Signals such as sound and temperature, which continuously vary in strength and quality, are said to be digital. True False

False They are analog.

Analog cellphones are 2G (second-generation) phones. True False

False They were 1G devices.

An interface device used to connect the same types of networks is called a node. True False

False This is a bridge.

2G and 3G cellphones are digital, not analog. True False

True

A thermometer and a speedometer are examples of analog devices. True False

True

A virus is a "deviant" program that is stored on a computer hard drive and can cause unexpected and undesirable effects. True False

True

A virus is capable of destroying or corrupting data. True False

True

Analog cellphones were 1G phones. True False

True

The short-range, wireless communications method aimed at linking hand-held devices at high speeds and at distances of 100-228 feet is called Wi-Fi. True False

True

Wi-Fi is a short-range wireless connection for LANs. True False

True

A type of wired communications technology used to connect equipment in a home network is the following: Ethernet HomePNA HomePlug any of these

any of these

The ________ is the basis for ALL telecommunications signals. bandwidth electromagnetic spectrum radio-frequency spectrum wireless application protocol

electromagnetic spectrum

To create larger networks, a bridge connects the same types of networks, and a ________ connects dissimilar networks. router gateway hub host

gateway

The highest level that a satellite can occupy in space is known as ________. geostationary earth orbit (GEO) high-earth orbit (HEO) medium-earth orbit (MEO) low-earth orbit (LEO)

geostationary earth orbit (GEO) The geostationary earth orbit is 22,300 miles and above and is always directly above the equator.

A mainframe computer that controls a large network is called the ________ computer. slave host client node

host A host computer is a mainframe or midsize central computer that controls the network.

A person sending a document over a phone line by converting a computer's digital signals to analog signals uses a ________. printer scanner digitizer modem

modem A modem converts a computer's digital signals into the telephone line's analog signals. The receiving modem converts analog signals into digital signals.

A ________ is the set of rules that govern the exchange of data between hardware and/or software components in a communications network. host protocol database packet

protocol