Hacker Highschool_ Lesson 4 Services and Connections.pdf

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LESSON 4
SERVICES AND
CONNECTIONS
LESSON 4 – SERVICES AND CONNECTIONS
“License for Use” Information
The following lessons and workbooks are open and publicly available under the following
terms and conditions of ISECOM:
All works in the Hacker Highschool project are provided for non-commercial use with
elementary school students, junior high school students, and high school students whether in a
public institution, private institution, or a part of home-schooling. These materials may not be
reproduced for sale in any form. The provision of any class, course, training, or camp with
these materials for which a fee is charged is expressly forbidden without a license including
college classes, university classes, trade-school classes, summer or computer camps, and
similar. To purchase a license, visit the LICENSE section of the Hacker Highschool web page at
www.hackerhighschool.org/license.
The HHS Project is a learning tool and as with any learning tool, the instruction is the influence
of the instructor and not the tool. ISECOM cannot accept responsibility for how any
information herein is applied or abused.
The HHS Project is an open community effort and if you find value in this project, we do ask
you support us through the purchase of a license, a donation, or sponsorship.
All works copyright ISECOM, 2004.
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LESSON 4 – SERVICES AND CONNECTIONS
Table of Contents
“License for Use” Information............................................................................................................... 2
Contributors..............................................................................................................................................4
4.0 Introduction........................................................................................................................................5
4.1 Services...............................................................................................................................................6
4.1.1 HTTP and The Web..................................................................................................................... 6
4.1.2 E-Mail – POP and SMTP..............................................................................................................7
4.1.3 IRC................................................................................................................................................8
4.1.4 FTP................................................................................................................................................8
4.1.5 Telnet and SSH..........................................................................................................................10
4.1.6 DNS.............................................................................................................................................10
4.1.7 DHCP......................................................................................................................................... 11
4.2 Connections.....................................................................................................................................12
4.2.1 ISPs ............................................................................................................................................ 12
4.2.2 Plain Old Telephone Service...................................................................................................12
4.2.3 DSL..............................................................................................................................................12
4.2.4 Cable Modems........................................................................................................................ 13
Further Reading.....................................................................................................................................14
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LESSON 4 – SERVICES AND CONNECTIONS
Contributors
Chuck Truett, ISECOM
Guiomar Corral, La Salle URL Barcelona
Jaume Abella, La Salle URL Barcelona - ISECOM
Kim Truett, ISECOM
Marta Barceló, ISECOM
Pete Herzog, ISECOM
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LESSON 4 – SERVICES AND CONNECTIONS
4.0 Introduction
The purpose of this lesson is to give you an understanding of some of the basic services which
networks use to provide and exchange information, and to discuss some of the methods in
which personal computers and local networks connect with the other networks which make
up the Internet.
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