"Better Today Than Yesterday"

CMAT and Company Operations

Team's Manual

Curriculum

Welcome to CMAT and Company

Student Network Notes

What is a network?

A network is a collection of PCs and other devices connected with cables to communicate between and share information between each other in groups of small electric pulses known as packets.

Benefits:

1.  Share expensive peripherals

2.   exchange data between users without using floppy discs

     3.    Centralize key computer programs

     4.    Automate backup with automatic backup

Components of a Network:

1.   PCs and peripherals

2.  Network cables

3.   Hub

4.   Network operating system

Types of Network:

1.  Server-client

      2.  Peer-to-peer

Network terms/activities:

1.   Folder and drive sharing - specify folders and drive you want others to use

2.    E-mail, electronic mail - rapid communications

3.    IP - internet protocol

Difference between hubs and switches:

Hubs and switches are different types of networking components that connect devices. They differ in how they pass on their data.

Hubs are multi port repeaters. They pass along everything they receive to every computer attached to them.

Switches control the flow of network traffic based on the address

information of each packet. The switch learns which devices are connected to what port then forwards packets to the appropriate location. The result is they reduce unnecessary traffic.

Hubs are best suited for small networks.

Switches are a better choice in larger networks.

Ethernet and Fast Ethernet

Three Issues to consider:

1.    Number of the hubs/repeaters - determined by power

2.     Length of cabling/coax

      3.    Type of cabling

 Rules are similar for Ethernet and for fast Ethernet

Ethernet is 10

Fast Ethernet is 100

We have duel speed hubs 10/100

        10/100 allows more user connections

        Network traffic, connected to the hub, is less vulnerable to collision

Class two hubs are faster

Class one is slow

Max cable length is 100 meters

Three Common Reasons for Expanding and Upgrading:

     1.    More ports

2.   More bandwidth

3.   Peer-to-peer complicated

When more ports are required, connect more hubs

For more bandwidth, add an Ethernet switch for upgrade to fast Ethernet

Peer-to-peer is more complicated

Move to a client-server

To add more users, connect another hub

If you have MDI/MDI-X hubs - use straight through connections to

Connect MDI.

Use cross-over twisted pair for MDI/X connections,.

INTERNET is worldwide network composed of government, academic, commercial, military, and corporate networks.

The World Wide Web is an Internet service that contains millions of pages.

These pages are stored on special Web Servers with link connection capability.

Web Browsers allow users to view Web pages.

Search Engines search the web for files and data.

To connect to the Internet

1.    Set up a modem

2.    Get Internet account from Internet Service Provider (ISP)

3.   Install a Web Browser