Extended Learning Module D

Network Basics

What is a Computer Network? What are the Benefits of Computer

Networking? Describe some networks

Computer network - two or more computers connected so that they can communicate with each other and share information, software, peripheral devices, and/or processing power.

Introduction

Advantages of Networks:

streamline work _________ and cut costs allow people within organizations to

collaborate share hardware, software, and processing

power enable geographically distant work groups to

communicate with each other allow businesses to ________ information with

external groups such as suppliers shorten business lead times and response

times support electronic commerce

IntroductionBasic Principles of Networks

1. Each computer must have a network card.

2. A network has at least one connecting device.

3. There must be communications media connecting the network hardware devices.

4. Each computer must have software that supports the movement of information.

Peer-to-Peer Home Networks

Internet Access Business Networks LANs, MANs, WANs, and

Communications Media Communications Service Providers

Peer-to-Peer Home Networks

Peer-to-peer network - a network in which a small number of computers share hardware, software and/or information.

You can setup a small peer-to-peer network

With Ethernet cards (NIC) and dedicated cables

Using the existing phone wiring

Peer-to-Peer Home Network

Peer-to-Peer Home NetworkHome Network Components

Figure D.1Hub, Switch, and Router as Roadway Intersectionspage 428

Peer-to-Peer Home NetworkHome Network Components

Typical Home Network

Figure D.2page 429

Peer-to-Peer Home NetworkWireless Access to Your Home Network

Wireless network access point or wireless access point - a device that allows computers to access a _________ network using radio waves.

Peer-to-Peer Home NetworkWireless Access to Your Home Network

WiFi, Wireless Fidelity, or IEEE 802.11b - a way of transmitting information in wave form that is reasonably fast and is often used for notebooks.

Bluetooth technology - provides entirely wireless connections for all kinds of communication devices.

Peer-to-Peer Home Networks Internet Access Business Networks LANs, MANs, WANs, and

Communications Media Communications Service Providers

Internet Access

Internet Access

Ways to Access the Internet at Home

1. Telephone line and a telephone or dial-up modem.

2. Telephone line and a Digital Subscriber Line (DSL) modem.

3. Cable TV line and a cable modem.4. Satellite dish and a satellite modem. 5. Provider that offers wireless connection for your

notebook.

Internet Access Wireless Internet Connection

Wireless Internet service provider (wireless ISP) - does the same job as standard Internet service providers except that you don’t need a wired connection for access.

Peer-to-Peer Home Networks Internet Access Business Networks LANs, MANs, WANs, and

Communications Media Communications Service Providers

Business Networks

Business Networks

Client/server network - a network in which one or more computers are servers and provide services to the other computers which are called clients.

Client/Server Architecture

Client Requests & ParametersRequests & Parameters

Disks for Storage

Server

Response & ResultsResponse & Results

TCP/IPHTTP

URLDatabase Query

Business NetworksClient/Server: A Physical View

There are many physical implementations of client/server networks

Conceptually, large networks work on the same principles as small ones

Business NetworksClient/Server: A Physical View

You still need Network cards Hubs Switches Routers Communications media and Network operating systems

Business NetworksClient/Server: A Physical View

Communications protocol (protocol) - a set of rules that every computer follows to transfer information.

Peer-to-Peer Home Networks Internet Access Business Networks LANs, MANs, WANs, and

Communications Media Communications Service Providers

LANs, MANs, MANs and Communications Media

LANs, MANs, WANs, & Communications MediaClassification of Networks by Geographic Distance

Local area network (LAN) - covers a limited _________ distance, such as an office, building, or a group of buildings in close proximity to each other.

Municipal area network (MAN) - covers a ________ area.

Wide area network (WAN) – covers a large geographic distances, such as a state, a country, or even the entire _________.

LANs, MANs, WANs, and Communications MediaTelecommunications Media: The Paths That Carry Information

Communications media - the paths, or physical channels, in a network over which information travels.

Wired ___________ media - transmit information over a closed, connected path.

__________communications media - transmit information through the air.

LANs, MANs, WANs, and Communications MediaTelecommunications Media: The Paths That Carry Information

Wired Communications Media include: Twisted-pair cable ________ cable Optical Fiber

LANs, MANs, WANs, and Communications MediaTelecommunications Media: The Paths That Carry Information

Wireless Communications Media Include: Microwave _________ Infrared

LANs, MANs, WANs, and Communications MediaInfrared and Omnidirectional Microware for Short Distances

Wireless communications media radiate information into the air, either very narrowly beamed or in many directions like ripples from a pebble tossed into a pond.

Infrared - a wireless communications medium that uses radio waves to transmit signals or information.

Bluetooth

Microwave transmission - a type of radio transmission.

WiFi http://www.wi-fihotspotlist.com/

Communications Service Providers

Communications service providers - third parties who furnish the conduit for information.

Public network - a network on which your organization _________ for time with others.

Communications Service Providers

Private network - communications media that your organization ______ or exclusively leases to connect networks or network components.

Value-added network (VAN) - a semipublic network that provides services beyond the movement of information from one place to another.

Virtual private network (VPN) – uses software to establish a ________ channel on the Internet for transmitting data.

Communications Service ProvidersKey Considerations for Communications Media

To determine the most appropriate communications medium, you must consider:

Capacity Reliability Cost Distance Mobility