ch 8

the number of email messages delivered each day far exceeds the number of letters delivered by U.S. Postal Service, why?

ALL OF THE ABOVE you can write and send an email faster than you can write and mail a letter email is delivered more rapidly, facilitates group communication, and can save money

computer networks

ALL OF THE ABOVE: allow people to share hardware resources, make it easier for people to share data, support collaboration through such tools as email and instant messaging

what is an important difference between internet newsgroups and mailing lists?

a mailing list message goes to only a specific group of people, whereas a newsgroup message is available for everyone to see

a modem

converts a digital signal into an analog signal and vice versa

what should people who use a public hotspot be aware of?

data transmitted over networks without WEP key encryption can be viewed by malicious eavesdroppers

today's email system is built on protocols that

don't ensure that each sender has a verifiable identity

3G and 4G networks were developed by the computer industry as part of the fiber-optic internet backbone

false

by definition, a computer network must be connected to the internet

false

most wireless computer networks today use infrared signals to transmit data

false

if you want to share a document with other people whose computers are connected to your LAN, you should upload the document to a(n)

file server

a 4G network

is based on fourth-generation wireless phone network technology

what is a service that connects computers and peripherals in the same building called?

local area network (LAN)

which of these is a generally accepted rule of netiquette?

lurking in a hang-glider enthusiasts newsgroup without posting any messages

what percentage of email messages is junk email (spam)?

more than 50%

what is the main difference between IM and email?

the asynchronous of nature of email communication

which of the following does not affect bandwidth?

the type of information being transmitted

what is the most common reason for installing a wi-fi hub in a home?

to allow PCs to connect to a network without wires

a single fiber-optic cable has the bandwidth of thousands of copper telephone cables

true

because peer-to-peer networking software is built into the windows and macintosh operating systems, a modern desktop computer can act as both client and server on a network

true

depending on your email client program and your preferences, your mail might be stored on a remote host or downloaded and stored on your local machine

true

email and instant messaging can filter out many human components of communication, increasing the chance of misinterpreted messages

true

simple technological solutions can reduce, but not eliminate, the spam problem for email users

true

the line that separates computer communication and telephone communication is being blurred by devices and technologies that operate in both realms

true

the most common types of networks today use a standard networking architecture known as ethernet

true

many experts say we're at the beginning of a revolution that is creating a vast grassroots network of public and private wireless hubs based on

wi-fi technology