Communications and Networks

fearlessquickMobile - Wireless

Dec 12, 2013 (3 years and 10 months ago)

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Professor Michael J. Losacco

CIS 1150


Introduction to Computer Information Systems

Communications and Networks

Chapter 8

Chapter

8

2
/24

Overview

Discuss Connectivity

Discuss The Wireless Revolution

Describe Communication Channels

Discuss Connection Devices

Discuss Connection Services

Describe Data Transmission Factors

Describe Different Types Of Networks

Describe Network Architectures



Chapter

8

3
/24

Communications

Connectivity

Use Networks to Link People and Resources

The Wireless Revolution

Stay Connected with Anyone Anywhere Any Time

Chapter

8

4
/24

Uses

Wireless Messaging

Text Messaging

Send / Receive Text Messages Using Phone

14
-
17: 60 v. 5

Picture Messaging

Send / Receive Graphics, Pictures, Video

Sexting: 30% of 17
-
year
-
olds

Web Services

Pew Internet
5/10

Pew Internet
12/09

Chapter

8

5
/24

Uses

GPS (Global Positioning System)

Signals Sent by Satellites Orbiting Earth

Signal Sent Every 1/1000 of a Second

Earth
-
based Receivers Analyze Signals

Determine Receiver’s Geographic Location

Groupware

Assists Groups in Working Together

Share Data Over Network

e.g., Schedule Meetings

Chapter

8

6
/24

Uses

Web Services

Software Applications

Communicate with Other Remote Computers

Use Internet or Internal Business Network

Mashup


Combines Services from Multiple Sources

Chapter

8

7
/24

Basic Elements

Sending and Receiving Devices

Communication Channel

Connection Devices

Data Transmission Specifications


Communication Systems

Chapter

8

8
/24

Communication Channels

Physical Connections

Twisted
-
pair Cable

Telephone Lines

Ethernet Cables

Used in Networks to Connect Variety of Components

Coaxial Cable

Over 80x Capacity of Twisted
-
pair

Fiber
-
optic Cable

Over 26,000x Capacity of Twisted
-
pair

Chapter

8

9
/24

Communication Channels

Wireless Connections

Bluetooth

Short
-
range Radio Signals (33 Feet)

Wi
-
Fi (Wireless Fidelity)

High
-
frequency Radio Signals

Microwave

Line
-
of
-
sight

Chapter

8

10
/24

Communication Channels

Wireless Connections

WiMax

Extends Range of
Wi
-
fi

Networks Using Microwaves

LTE (Long Term Evolution)

Currently Similar to
WiMax

with Future speed Benefits

Satellite

Microwave Relay Stations in Space

Uplink / Downlink

Affected by Weather

Chapter

8

11
/24

Connection Devices

Modem

Modulation


Digital to Analog

Demodulation


Analog to Digital

Transfer Rate

Bps


Bits per Second

Typically Mbps

Chapter

8

12
/24

Connection Devices

Modem

Types

Telephone

Connect Computer Directly
t
o Telephone Line

DSL

Uses Standard Phone Lines

Creates High
-
speed Connection to Phone Company's Offices

Cable

Uses Same Coaxial Cable as Your Television

Wireless

Portable High
-
speed Connectivity From Virtually Anywhere

Chapter

8

13
/24

Connection Services

DSL (Digital Subscriber Line)

Use Existing Phone Lines

Cable

Uses Existing TV Cable

Satellite Connection Services

Use Almost Anywhere

Slower than DSL and Cable Modem

Cellular Services

4G Using
WiMax

and LTE

Chapter

8

14
/24

Data Transmission

Bandwidth

Measurement
of
Capacity
of
Channel

Categories

Voiceband

Medium Band

Broadband

DSL, Cable, and Satellite

Baseband

Chapter

8

15
/24

Data Transmission

Protocol

Collection of Procedures

Establish, Maintain, & Terminate Transmissions

Type of Error Checking Used

Data Compression Method, If Any

Indicate Finished Sending Message

Indicate Message Has Been Received

Chapter

8

16
/24

Data Transmission

Protocol

TCP/IP

Internet Standard

Identification

IP Addressing

Domain Name Server (DNS)

Packetization


Chapter

8

17
/24

Networks

Node

Any Device Connected to Network

Client

Node that Requests and Uses Resources

Server

Node that Shares Resources with Other Nodes

Directory Server

Manages Resources for Entire Network

Chapter

8

18
/24

Networks

Host

Any Computer System Accessed Over a Network

Router

Forwards Data Packets to Their Destination

Switch

Coordinates Flow of Data

NIC

NOS

Chapter

8

19
/24

Network Types

Local Area Network (LAN)

Home Network

Wireless LAN (WLAN)

Hotspots

Personal Area Network (PAN)

Metropolitan Area Network (MAN)

Wide Area Network (WAN)

Chapter

8

20
/24

Network Architecture

Topologies

Describes How a Network is Arranged

Bus

Ring

Star

Tree

Mesh

Chapter

8

21
/24

Network Architecture

Strategies

How Resources
are
Coordinated
and S
hared

Client/Server

Server Provides Access to Resources for Clients

P2P (Peer
-
to
-
peer)

Can Act as Both Client and Server

File Sharing

Chapter

8

22
/24

Organizational Networks

Internet Technologies

Intranet

Private Network Within An Organization

Extranet

Private Network

Provides Limited Access To Network

Vendors

Customers

Chapter

8

23
/24

Organizational Networks

Network Security

Firewall

Proxy Server

Controls Access to Network

Intrusion Detection System (IDS)

Analyzes incoming and outgoing traffic

Virtual Private Network (VPN)

Secure Connection to Company Network

For Mobile Users, Vendors, & Customers

Chapter

8

24
/24

Careers in IT

Network Administrator

Manage Company
LAN and WAN
Networks

Network Design
,
Implementation
,
Maintenance

Plan
and
Implement Network Security

Bachelor's Degree in Computer Science

Good Communication Skills

Annual Salary of $46,000
-

$84,000