Trails End Computer Club

Lesson 7 - - The Internet

Within the last few years the internet has developed into a world wide communication network that may connect most homes with many computers and other devices around the world.

The elements of the internet are:

The servers which store the information we request.

The nodes which routes data from the source to the destination.

The transmission connects node to node that may be cables, fiber optics, radio, satellites, microwave etc.

The clients that may be your computer, smart phone, smart TV etc.

The elements above work together using a set of rules to transmit data.

When you enter an address “tecc.apcug.org” into your browser address bar, a request is sent to an DNS (domain name server) that directs you automatically to the server where the site you want to visit is stored.

Upon receiving your request, the server can transmit back to you the source code to display the page you want to see.

The server sends information back to your computer in small packets (often less than 1500 characters per packet). Each packet has a header that tells the system where it goes and how it fits in so your browser can display the web page you requested. These packets may take different routes getting back to you which makes the internet so robust.

This same packet procedure is used to transmit voice, pictures, music and even movies over the internet.

Lets do some other things:

PING A program built into Windows that will send out a tiny signal and the signal will be returned to us informing us how long it took for the round trip. This is much like the sound wave that a warship may send out in the water, bounce off another ship and return with a time lag to tell us how far the other ship is from us.

  1. Hold down the Windows key while tapping the “R” key.

  2. In the box enter “cmd” without the “”.

  3. In the command box type “ping www.tecc.apcug.org” without the “” and hit enter.

Trace route A program built into Windows that will display the route used over the internet to arrive at the destination of your internet request.

  1. Hold down the Windows key while tapping the “R” key.

  2. In the box enter “cmd” without the “”.

  3. In the command box type “tracert www.tecc.apcug.org” without the “” and hit enter.