Exam 5: Local Area Networks

In a wireless ____ network,devices broadcast directly to each other.

To connect to a LAN,a computer requires ____.

-In the accompanying figure,the item on the left simply plugs into a serial port on the outside of the system unit.

Microwaves cannot be aimed in a single direction and they have less carrying capacity than radio waves.

The bandwidth of a digital channel is usually measured in ____________________ per second (bps).

Ethernet is easy to ____.

In the technology referred to as ____,a message is divided into several parcels that can be routed independently to their destination.

The telephone system uses a technology called ____,which establishes a dedicated,private link between telephones for the duration of a call.

____ encryption uses one key to encrypt a message but another key to decrypt the message.

A ____ is a network device that extends a wired network by adding additional ports.

High-bandwidth communications systems,such as cable TV and DSL,are sometimes referred to as peakband._________________________

A communications ____________________,or link,is a physical path or a frequency used for signal transmission.

-In the accompanying figure,the networks that don't have an icon of a lock next to them aren't secured,and are open targets for hackers to steal data,spread viruses,and create a launching pad for spam.

If a network interface card is not built into the main system board of a computer,it can be added to a slot in the system board or to a(n)____________________ port.

For a typical home network,all that's needed in terms of network equipment is a wireless ____________________ that includes an Ethernet switch and Internet gateway.

-The wave on the bottom in the accompanying figure depicts a digital signal.

File ____________________ allows files containing documents,photos,music,and other data to be accessed from computers other than the one on which they are stored.

MATCHING Identify the letter of the choice that best matches the phrase or definition. -Also called radio waves

Microwavesare electromagnetic signals that can be aimed in a single direction and have more carrying capacity than radio waves._________________________

A ____ is a physical path or a frequency used for signal transmissions.