I N T E R N E T R E S O U RC E S

COMMUNICATIONS AND NETWORKS

UNIT OBJECTIVES

• After completing this chapter you will be able to:1. Discuss the purpose of the components required

for successful communications and identify various sending and receiving devices

2. Describe various uses of computer communications

3. List the advantages of using a network, and differentiate among LANs, MANs and WANs

4. Differentiate between client/server and peer-to-peer networks, and describe how P2P networks work

UNIT OBJECTIVES

5. Differentiate among a star, bus, and ring network

6. Describe the various network communications standards

7. Explain the purpose of communications software8. Describe commonly used communications

devices9. Discuss different ways to set-up a home network10.Describe various physical and wireless

transmission media

COMMUNICATIONSCOMMUNICATIONS AND NETWORKS

COMMUNICATIONS

• Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information• Today, even the smallest devices can

communicate with each other – often via the Internet

COMMUNICATIONS

• For successful communications you need:1. A sending device that initiates an instruction

to transmit data, instructions or information2. A communication channel or transmission

media on which the data, instructions, or information travel

3. A communication device that connects the communications channel to a receiving device that accepts the transmission

USES OF COMMUNICATIONSCOMMUNICATIONS AND NETWORKS

USES OF COMMUNICATIONS

• Computer communications are everywhere• Many require that you subscribe to an Internet

access provider• With others, organizations such as a business or

school provide the communications services

SUMMARY OF COMMUNICATIONS PREVIOUSLY DISCUSSED

Communications Previously DiscussedBlogs Newsgroups

Chat Rooms RSS

E-Mail Video Conferencing

Fax VoIP

FTP Web 2.0

Instant Messaging Wikis

WIRELESS MESSAGING SERVICES

• Users can send and receive wireless messages to and from smartphones, cell phones, and handheld game consoles using three techniques1. Text messaging2. Picture/Video messaging, and3. Wireless Instant Messaging

• The type of messaging depends on the on the services offered by your wireless Internet service provider, or WISP

TEXT MESSAGING

• A mobile device with text messaging allows users to send and receive short text messages on a phone or other mobile device• Services allow the user options to send

and receive:• Mobile to Mobile• Mobile to E-Mail• Web to Mobile, and• Mobile to Provider

PICTURE/VIDEO MESSAGING

• With picture messages users can pictures and sound files, as well as short text messages, to another device• With video messages users can send

short, about :30, videos is addition to other type of messages• Smart phones and other devices using

MMS, typically have a built-in camera• As a consumer, you should be aware of memory

availability and camera quality

WIRELESS INSTANT MESSAGING

• Wireless instant messaging (IM) is a real-time communications service that allows mobile devices to exchange messages with other online users• Some WISPs partner with IM services• AT&T allows communications through AIM,

Windows Live Messenger, and Yahoo! Messenger